WO2000014953A1 - Method and apparatus for processing variable bit rate information in an information distribution system - Google Patents
Method and apparatus for processing variable bit rate information in an information distribution system Download PDFInfo
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- WO2000014953A1 WO2000014953A1 PCT/US1999/019656 US9919656W WO0014953A1 WO 2000014953 A1 WO2000014953 A1 WO 2000014953A1 US 9919656 W US9919656 W US 9919656W WO 0014953 A1 WO0014953 A1 WO 0014953A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
Definitions
- the invention relates to information distribution systems generally and, more particularly, the invention relates to a method and apparatus for adapting the distribution of stored information streams in response to disk bandwidth availability and/or distribution channel bandwidth availability.
- MPEG Moving Pictures Experts Group
- MPEG-1 refers to ISO/IEC standards 11172 and is incorporated herein by reference.
- MPEG-2 refers to ISO/IEC standards 13818 and is incorporated herein by reference.
- a compressed digital video system is described in the Advanced Television Systems Committee (ATSC) digital television standard document A/53, and is incorporated herein by reference.
- ATSC Advanced Television Systems Committee
- NBR variable bit rate
- NBR MPEG is currently used in one or more satellite television systems. Such systems typically encode a set of channels (i.e., audio-visual programs) together, using a statistical multiplexer that drives the rate controller of each channel encoder. All the decisions about how to allocated the available bits are decided when the video is being encoded, just before transmission.
- disk bandwidth i.e., the maximum amount of data that may be retrieved in a given time period
- disk bandwidth may be exceeded by the aggregated bandwidth demands of the subscribers, especially where NBR streams are retrieved from the disk.
- the invention is a method and apparatus for managing both link and disk bandwidth utilization within the context of a multiple subscriber or user information distribution system by selectively providing variable bitrate and constant low bitrate information streams to one or more subscribers.
- a method for managing bandwidth utilization comprises the steps of: monitoring an indicium of bandwidth utilization within the information distribution system; providing, via the communications link and in response to the indicium of bandwidth utilization indicating that an overutilization condition does not exist, a first variable bitrate information stream to at least one of the plurality of subscribers, the first variable bitrate information stream having associated with it a bitrate that may vary between a nominal first lower bitrate and a nominal first upper bitrate; and providing, via the communications link and in response to the indicium of bandwidth utilization indicating that an overutilization condition does exist, a second variable bitrate information stream to at least one of the plurality of subscribers, the second variable bitrate information stream having associated with it a bitrate that may vary between a nominal second lower bitrate and a nominal second upper bitrate, the nominal second lower bitrate being and the nominal second upper bitrate being less than the nominal irst upper bitrate.
- the above-mention indicium of bandwidth utilization comprises one of a communications link bandwidth utilization indicium and a storage device access bandwidth utilization indicium, the storage device being used to store the first and second variable bitrate information streams.
- FIG. 1 depicts an information distribution system 100 including apparatus according to the invention
- FIG. 2 depicts a flow diagram of a disk scheduler routine 200 suitable for use in the apparatus of FIG. 1;
- FIG. 3 depicts a flow diagram of an output switch decision routine 300 suitable for use in the apparatus of FIG. 1;
- FIG. 4 depicts a flow diagram of a switch transient minimization routine 400 suitable for use in the apparatus of FIG. 1; and FIG. 5 depicts a graphical representation of a NBR extent and a
- FIG. 1 depicts an interactive information distribution system 100 including apparatus according to the invention.
- the interactive information distribution system 100 comprises information provider equipment 5 that provides information to a plurality of subscriber equipment 40-1 through 40-n via a communications link LINK.
- the plurality of subscriber equipment 40-1 through 40-n send messages and other commands (e.g., program requests) to the information provider equipment 5 via a back channel BC.
- the provider equipment 5 includes an information server 30 and an information storage unit 20.
- the information storage unit 20 illustratively a mass storage unit such as a disk array, is responsive to a control signal C produced by the information server 30.
- the control signal C is indicative of one or more of a plurality of stored programs or other information that are to be served, via the information server 30, to a respective one or more subscribers 40.
- the information storage unit 20 couples the retrieved information stream(s) to a respective one or more of a plurality of data outputs READ.
- the information server 30 reads the retrieved information from the data outputs READ of the information storage unit 20
- a storage unit 20 suitable for use in the present invention is described by Chin et al. in U.S. Patent No. 5,579,527, and herein incorporated by reference in its entirely.
- a system for supplying streams to multiple users suitable for use in the present invention is described by Bleidt et al. in U.S. Patent No. 5,671,377, and herein incorporated by reference in its entirely. It must be noted that while the invention may advantageously utilizes a massively parallel storage, retrieval and distribution system, the invention does not require the use of such a system. Rather, the invention is well suited to any storage arrangement in which the amount of data to be retrieved in any given amount of time is so great that disk (and input/output) bandwidth management becomes a critical consideration, such as in video on demand and video serving applications.
- the information server 30 comprises a buffer memory 30-1, a multiplexer 30-2 and a modulator 30-3.
- the information server 30 also comprises a microprocessor and other support circuitry (not shown).
- the buffer memory 30-1 is capable of holding at least one service period (i.e., one extent) worth of VBR and CLBR streams for each active subscriber in the system.
- the exemplary embodiment uses a service period of two seconds. Thus two seconds of CLBR and, if sufficient disk bandwidth was available, VBR streams for each user. In the case of 30 frames per second video, each memory portion holds 30 frames of video and any associated audio information.
- the multiplexer 30-2 utilizes a direct memory access (DMA) output link table to access appropriate portions of the buffer memory 30-1, and multiplexes the accessed information to form a multiplexed output stream.
- the multiplexed output stream is modulated by the modulator 30-3 in a known manner and transmitted via the communications link LINK to the subscriber(s).
- DMA direct memory access
- the information server 20 includes means for executing a disk scheduler routine 200, a switch decision routine 300 and (optionally) a switch minimization routine 400. These routines will be described in more detail below with respect to FIGS. 2-4. Briefly, the disk scheduler routine 200 models the demand for disk bandwidth and anticipates when the demand will exceed the available bandwidth; the switch decision routine 300 analyzes the demand generated by all the streams that share a common output link to determine when, and if, the server needs to switch between the VBR and CLBR streams; and the switch minimization routine 400 provides a "second pass" at the DMA output table formed in the switch decision routine 300 to smooth out any excessive switching transitions such that each user in the system "suffers" approximately the same amount of service degradation.
- the subscriber equipment 40 contains a set top terminal 42, an input device 44, and a display device 46.
- the set top terminal 42 receives and demodulates the information stream transmitted by the information server 30.
- the set top terminal also transmits information, such as subscriber requests, to the information server 30 via the back channel BC.
- the set top terminal 42 includes a microprocessor and various support circuitry (not shown).
- the set top terminal 42 is responsive to the input device 44 to provide interactive control of the information provided by the information server 30.
- the provided information is controlled by a subscriber via the input device 44, e.g., an infrared (IR) or radio frequency (RF) remote control unit.
- IR infrared
- RF radio frequency
- the provided information e.g., audio, video, still photographs, graphics and the like are portrayed on the display device 46 such as a television, video monitor, and the like. If the optional back channel BC is used, then the information server
- information server 30 receives requests for, e.g., audiovisual programming or other information from subscribers via the back channel BC, illustratively a quadrature phase shift keying (QPSK) channel or a public telecommunication channel.
- QPSK quadrature phase shift keying
- information server 30 retrieves the requested audiovisual programming or other information from the information storage unit 20.
- the retrieved information stream(s) associated with each requesting subscriber, and a terminal identification number (TID) relating the retrieved information stream(s) with the appropriate subscriber, are then modulated or otherwise incorporated into a communications link information stream that is transmitted to the subscribers via the communications link.
- TID terminal identification number
- the communications link information stream is then transported to the subscribers via the communications link LINK, illustratively a Quadrature Amplitude Modulation (QAM) transmission channel.
- the communications link LINK and the back channel BC may be carried by a common fiber or cable network at mutually exclusive spectral regions.
- the communications link LINK and back channel BC may also be carried by distinct communications networks.
- the communications link LINK may be a fiber optic, cable television, satellite or terrestrial broadcast network and the like.
- the communications link has associated with it a finite amount of bandwidth. For example, if the communications link is capable of supporting a maximum bitrate of 100Mbps, then the sum of the bitrates of the information streams contemporaneously provided to the subscribers (plus any overhead information, such as encryption information, routing information and the like) must not exceed the maximum communications link bitrate. Thus, in the case of 5Mbps fixed bitrate information streams (disregarding overhead bitrate utilization) up to 20 subscribers may be serviced during any one time interval.
- the information server 30 models the bandwidth utilization of the communications link.
- the link bandwidth model may comprise a software or hardware or a combination of both software and hardware.
- the purpose of the link bandwidth model is to determine if a maximum "safe" bitrate utilization threshold has been exceeded.
- the safe bitrate utilization threshold may be predefined or adjustable. For example, the safe bitrate utilization threshold may be defined as a percentage (e.g., 95%) of the maximum bitrate of the communications link, or as an actual bitrate (e.g., 95Mbps).
- the VOD system described thus far provides audiovisual programming and other information to subscribers in response to, e.g., subscriber requests for such programming or information.
- the audio-visual programming an other information is stored within the storage unit as two distinct streams.
- a first stream associated with each program comprises a variable bit rate (VBR) stream, illustratively an MPEG-like transport stream that has been encoded such that the quality or fidelity level of individual encoded frames (e.g., video frames) is relatively constant. That is, the VBR stream is produced by, e.g., an MPEG encoder including a rate controller that operates to keep the quality or fidelity (as defined by, e.g., quantizer step size and other parameters) of each video frame at a relatively constant level. Since some frames will require more data to encode than others, the bitrate of this stream will be inherently variable.
- VBR variable bit rate
- the bitrate of this "quality constrained" stream (i.e., the VBR stream) is also held to within a relatively wide bitrate range of 0.5Mbps to 9.0Mbps, though centered around an average or "target" data rate.
- a second stream associated with each program comprises a constant low bitrate (CLBR) stream, illustratively an MPEG-like transport stream that has been encoded such that the bitrate of the encoded stream is relatively constant. That is, the CLBR stream is produced by, e.g., an MPEG encoder including a rate controller that operates to keep the bitrate of the encoded stream at a relatively constant level.
- the bitrate of this "bitrate constrained" stream (i.e., the CLBR stream) is also held to within a relatively low bitrate range of 0.75Mbps to 1.5Mbps.
- the CLBR stream may be produce by transcoding the VBR stream. That is, the output of the MPEG (or other) encoder producing the VBR stream may be modified such that the bitrate is reduced at the expense, e.g., of variations in frame quality.
- the invention may read whichever stream (preferable the VBR stream) that the disk bandwidth will support. Ideally, both the VBR and CLBR streams are read for each respective subscriber. If the disk bandwidth is too low at any given time, then it may be necessary to read only one of the streams (i.e., the CLBR stream) for one or more subscribers.
- FIG. 5 depicts a graphical representation of a VBR extent and a
- FIG. 5 depicts in a top row a VBR stream having a variable bitrate of 0.5 to 9Mbps and in a bottom row a CLBR stream having a bitrate of 0.75 to 1.5Mbps. The two rows are depicted as a function of time. It must be noted that while the CLBR stream is termed a "constant low bitrate" stream, the bitrate does vary somewhat.
- the VBR and CLBR stream are each divided into time extents of, illustratively, 2 seconds each.
- FIG. 5 depicts three such extents (i.e., EXT 1, EXT 2 and EXT 3).
- Each time extent includes a plurality of access points such as sequence headers or intra-coded information frames (i.e., I-frames).
- I-frames intra-coded information frames
- the access points are points within the VBR or CLBR stream where the stream may be entered without producing a significant "glitch" at a subscriber side decoder (e.g., due to buffer overflow/underflow, prediction errors or acquisition errors). These access points are aligned on a frame to frame or header to header basis within the corresponding VBR and CLBR streams.
- the synchronization or indexing information may be contained within, e.g., a "server control" packet (i.e., identified by a unique packet identification or PID), a user data field or other portion of the streams.
- a "server control" packet i.e., identified by a unique packet identification or PID
- PID packet identification
- the purpose of the indexing information is to point from one stream into another such that stream switching (i.e., multiplexing) may be performed without loss of content continuity or significant artifact generation.
- the corresponding CLBR and VBR streams are stored contiguously on a disk within the storage unit 20 so they can be read together with a single seek.
- sufficient disk bandwidth is not available, only the CLBR portion of an extent is read, otherwise both components are read.
- link bandwidth is not available for the VBR stream, then the CLBR data is sent.
- FIG. 2 depicts a flow diagram of a disk scheduler routine 200 suitable for use in the apparatus of FIG. 1. Specifically, the disk scheduler routine 200 is used to read information from the storage unit 20 at a maximum rate defined by the bandwidth of the components comprising the storage unit 20.
- the disk scheduler routine 200 executed for each service period N.
- a service period is the amount of time required to play a full extent of video information. In the exemplary embodiment, this amount of time is approximately two seconds. There is, of course, a variable number of bytes within one extent, since the number of bytes depends upon the average bitrate of the variable bitrate stream.
- the routine 200 is entered at step 202 and proceeds to step 204, where the available disk bandwidth over the present service period N is calculated. The routine 200 then proceeds to step 206.
- the routine 200 sorts the users that need to access the disk during the service period N in a manner that reduces the impact of switching between VBR and CLBR streams. That is, the users are sorted into a prioritized list where some users are preferentially allocated a VBR stream (others are optionally preferentially allocated a CLBR stream). For example, those users who are presently receiving a VBR stream may preferentially continue to receive a VBR stream, thereby avoiding any switching artifacts. Similarly, those users who very recently switched from a VBR stream to a CLBR stream are preferentially allocated a CLBR stream, thereby avoiding additional switching artifacts. The inventors note the artifacts due to stream switching operations tend to be more objectionable to the average viewer (i.e., subscriber) than the moderate quality degradation related to a lower bitrate video stream. The routine 200 then proceeds to step 208.
- the disk BW required for the next prioritized user (per the list generated at step 206) to access both the VBR and CLBR extents associated with that user for the present service period N are calculated.
- the routine 200 then proceeds to step 208.
- the user disk BW calculated at step 208 as added to an accumulated disk BW for the service period. That is, an accumulated service period BW variable is initialized to zero for each service period (e.g., at step 204) and incremented by the amount calculated in step 208.
- the routine 200 then proceeds to step 212.
- a query is made as to whether the accumulated BW (from step 210) exceeds the available BW (from step 204). If the query at step 212 is answered affirmatively, then the routine 200 proceeds to step 216. If the query at step 212 is answered negatively, then the routine 200 proceeds to step 214.
- both the VBR and CLBR extents associated with the user for the present service period N are retrieved from the disk (e.g., storage unit 20).
- the routine 200 then proceeds to step 218.
- step 216 only the CLBR extent associated with the user for the present service period N is retrieved from the disk (e.g., storage unit 20). The routine 200 then proceeds to step 218.
- a query is made as to whether there are more users to be processed. That is, a query is made as to whether each user sorted at step 206 to form the prioritized user list has been processed. If the query at step 218 is answered affirmatively, then the routine 200 proceeds to step 222 where it is exited. If the query at step 218 is answered negatively, then the routine 200 proceeds to step 220, where the next user on the prioritized list is identified. Steps 208-218 are then repeated for the next user.
- the disk scheduler routine 200 reads the appropriate stream(s), which are then stored in the buffer memory 30-1 of the information server 30. That is, each of the subscribers is allocated a portion of the buffer memory 30-1. The allocated portion for each subscriber is used to store one extent of the respective CLBR stream and, if read, VBR streams.
- FIG. 3 depicts a flow diagram of an output switch decision routine
- the output switch decision routine 300 is executed for a service period N-l (i.e., the service period temporally preceding the service period processed by the disk scheduler routine 200 of FIG. 2).
- N-l i.e., the service period temporally preceding the service period processed by the disk scheduler routine 200 of FIG. 2.
- the exemplary embodiment uses a service period of two seconds.
- CLBR the service period temporally preceding the service period processed by the disk scheduler routine 200 of FIG.
- VBR video bandwidth stream
- each memory portion holds 30 frames of video and any associated audio information.
- the output switch decision routine 300 is used to selectively couple the extent information stored in the buffer memory 30-1 to the multiplexer 30-3 for multiplexing into the link information stream (which is then modulated and transmitted to the subscribers).
- the output switch decision routine 300 selects available VBR and CLBR streams from the buffer memory 30-1 in a manner tending to maximize the utilization of the bandwidth of the communications link LINK.
- the output switch decision routine 300 is used to select the appropriate values for use in a, e.g., an output table for use in a direct memory access (DMA) of the buffer memory 30-1 by the multiplexer 30-3.
- the DMA output table comprises a list of DMA control commands associated with each active subscriber in the system. Each DMA control command comprising a pointer to a respective portion of memory (e.g., the access point of a stream to be transmitted to a user), a duration parameter identifying an amount of memory to be read (e.g., time or amount of data), and a bitrate parameter identifying a rate at which the identified data is to be read.
- the output switch decision routine 300 is entered at step 302 and proceeds to step 304, where the scheduling interval is divided into a plurality of frame intervals approximating, e.g., an average video frame (e.g., 33 milliseconds).
- the frame interval selected is not critical, only that the interval be relatively brief compared to the extent interval.
- the routine 300 then proceeds to step 306.
- step 306 an output link, corresponding to an output information stream to be delivered to one or more subscribers via the communications link LINK, is selected.
- the routine 300 then proceeds to step 308.
- the current total packet rate for all users on the selected output link over the determined frame interval is computed. This computation may be performed with, e.g., meta-data stored within each CLBR stream and VBR stream.
- the meta-data includes information such as the size of the frames within the stream, the appropriate entry points into the stream and frame synchronization information defining the relative positions of related frames within associated CLBR and VBR streams.
- the routine 300 then proceeds to step 310.
- a query is made as to whether the packet rate is greater than or equal to the link rate. That is, a query is made as to whether the total packet rate for the particular output link exceeds the maximum data rate for that output link over the current frame interval for all the users. If the query at step 310 is answered affirmatively, then the routine 300 proceeds to step 312. If the query at step 310 is answered negatively, then the routine 300 proceeds to step 318.
- one of the VBR users is selected. It must be noted that there will always be at least one VBR user, since the CLBR is selected such that if all subscribers used a CLBR stream, the link bitrate would be much lower than the maximum link bitrate. In this manner, at least one subscriber is always able to use a VBR stream.
- the routine 300 then proceeds to step 314.
- step 314 the portion of the buffer memory 30-1 allocated to the VBR stream of the selected VBR user is scanned temporally backwards until the previous access point within the stored VBR stream is located. This is the point within the VBR stream that stream may be entered (i.e., sequence header or I-frame) without a significant generation of artifacts. Similarly, since the CLBR stream associated with the VBR stream may be entered at this point, meta-data within the VBR stream (or CLBR stream) may be used to identify the access point within the CLBR stream. The routine 300 then proceeds to step 316.
- a switch decision is made to switch from the VBR stream (at the located access point) to the CLBR stream (at the corresponding access point). That is, a switch is made between the VBR and CLBR streams after aligning the streams at the located access point.
- the multiplexer 30-3 of FIG. 1 stops including the VBR stream (and starts including the CLBR stream) in the multiplexed output stream at the located access point.
- the routine 300 then proceeds to step 316
- steps 312 through 316 is directed toward reducing the bandwidth necessary to transmit the data identified in, e.g., the DMA output table.
- the purpose of the invention is to maximally utilize the available link bandwidth, it is desirable to use any available bandwidth (if possible). This recapturing of bandwidth occurs in steps 318 to 326.
- a query is made as to whether a subscriber or user presently provided with a CLBR stream has an associated VBR stream that may "fill up" the available link bandwidth. That is, can a VBR stream be substituted for a CLBR stream such that the available link bandwidth may be recaptured? If the query at step 318 is answered negatively, then the routine 300 proceeds to step 328. If the query at step 318 is answered affirmatively, then the routine 300 proceeds to step 320.
- step 320 one of the CLBR users (there may be more than one) having an VBR stream that may "fill up" the available link bandwidth is selected.
- the routine 300 then proceeds to step 322.
- step 322 the portion of the buffer memory 30-1 allocated to the CLBR stream of the selected CLBR user is scanned temporally forwards until the next access point within the stored CLBR stream is located. This is the point within the CLBR stream that stream may be entered (i.e., sequence header or I-frame) without a significant generation of artifacts.
- a switch decision is made to switch from the CLBR stream (at the located access point) to the VBR stream (at the corresponding access point). That is, a switch is made between the CLBR and VBR streams after aligning the streams at the located access point.
- the multiplexer 30-3 of FIG. 1 stops including the CLBR stream (and starts including the VBR stream) in the multiplexed output stream at the located access point.
- the routine 300 then proceeds to step 308.
- step 322 a next access point in a CLBR stream is located in step 322, whereas a previous access point in a VBR stream was located in step 314. This is because the steps associated with step 322 are directed toward increasing a bitrate, while those associated with step 314 are directed toward decreasing a bitrate. Thus, by locating a next access point in step 322, the potential for exceeding the bit budget by repeating information (i.e., duplicating information in the output stream) is obviated.
- step 328 a query is made as to whether there are more output links to be processed. If the query at step 328 is answered affirmatively, then the routine 300 proceeds to step 330, where the next output link is selected, and to step 308. If the query at step 328 is answered negatively, then the routine 300 proceeds to step 332.
- step 332 a query is made as to whether there are more frame intervals within the present scheduling interval to be processed. If the query at step 332 is answered affirmatively, then the routine 300 proceeds to step 334, where the next frame interval within the present scheduling interval is selected, and to step 308 (where the first output link in the next frame interval is selected). If the query at step 332 is answered negatively, then the routine 300 proceeds to step 336 where it is exited.
- steps 314 and 322 may be performed directly on the buffer memory 30-1.
- the meta-data gives sufficient indexing information it is preferable (and faster) to find appropriate stream locations using the meta-data to index into the buffer memory 30-1.
- an initial DMA output table i.e., the DMA table associated with the preceding scheduling interval
- the routine 300 may result in objectionable back and forth switching between VBR and CLBR streams (over a number of scheduling intervals)
- the routine 300 of FIG. 3 may optionally proceed to a minimization routine 400, which will now be described with respect to FIG. 4. 533/128
- FIG. 4 depicts a minimization routine 400 suitable for use in the apparatus of FIG. 1 and in the routine 300 of FIG. 3. Specifically, FIG. 4 depicts a minimization routine 400 that is intended to minimize excessive switching between CLBR and VBR streams as experienced by a single user. As previously noted, switching back and forth between CLBR and VBR streams produces artifacts considered by the inventor to be more objectionable than the somewhat degraded quality of a CLBR stream (as compared to the quality of a VBR stream).
- the routine 400 is entered at step 402, and proceeds to step 406 where the first frame interval of the present scheduling interval is selected. The routine 400 then proceeds to step 408.
- an output link corresponding to an output information stream to be delivered to one or more subscribers via the communications link LINK, is selected.
- the routine 400 then proceeds to step 410.
- a first of a plurality of users is selected for subsequent examination.
- the routine 400 then proceeds to step 412, where a query is made as to whether the selected user will experience a CLBR to VBR to CLBR switching transition. That is, a query is made as to whether, within a single frame interval, the selected user will switch between the CLBR stream and the VBR stream and back to the CLBR stream, thereby providing experiencing two objectionable switching events. If the query at step 412 is answered negatively, then the routine proceeds to step 416. If the query is answered affirmatively, then the routine 400 proceeds to step 414.
- step 414 the VBR portion of the user stream that is between the two identified CLBR portions is replaced by the CLBR stream corresponding to the VBR stream. That is, where three stream segments identified in step 412 (CLBR - VBR - CLBR) are present, the VBR extent is replaced by a corresponding CLBR extent such that the user does not experience two switching events.
- the routine 400 then proceeds to step 416.
- step 416 a query is made as to whether more users are to be processed. If the query at step 416 is answered affirmatively, then the routine 400 proceeds to step 418, where the next user is selected, and to step 412. If the query at step 416 is answered negatively, then the routine 400 proceeds to step 420.
- step 420 a query is made as to whether more output links are to be processed. If the query at step 420 is answered affirmatively, then the routine 400 proceeds to step 422, where the next output link is selected, and to step 410. If the query at step 420 is answered negatively, then the routine 400 proceeds to step 424.
- a query is made as to whether more frame intervals within the present scheduling interval remain to be processed. If the query at step 424 is answered affirmatively, then the routine 400 proceeds to step 425, where the next frame interval is selected, an to step 408. If the query at step 424 is answered negatively, then the routine 400 proceeds to step 426 where it is exited.
- the above-described minimization routine 400 will, upon its full execution, result in the "smoothing" of excessive switching transitions so that users or subscribers within the information distribution 100 of FIG. 2 do not experience unpleasant and/or undesirable artifacts due to such excessive switching between CLBR and VBR streams.
- the server control packets included the following information for each file: 1) the minimum, average and maximum video bitrate for this file in packets/second. This is useful to know when a user initially starts playing a file, since the server needs to verify that there is enough output link bandwidth for the user. 2) the audio bitrate in packet/second.
- the server control packets included the following information for each extent: 1) the average video packet rate for the extent in packets/second. 2) the frame rate.
- the frame rate is used to model the consumption of frames by the decoder and to compute the packet rate for each output frame time. 3) the number of access points in this extent.
- the server control packets included the following information for each access point (sequence header or I-frame): 1) a pointer (e.g., an offset or absolutely addressed packet number to the first CLBR packet of this access point. 2) a pointer (packet number) to the first VBR packet of this access point. 3) the number of frames in this sequence. 4) the average video packet rate for this sequence in packets/second. 5) the maximum per frame packet rate in this sequence in packets/second. 6) the frame rate. This is only needed if the frame rate is allowed to change at every sequence header. 7) a single bit flags indicating that (a) this access point begins with a sequence header; or (b) this access point marks splice in point; or (c) this access point marks splice out point.
- the server control packets included the following information for each frame: 1) a pointer (packet number) to the first packet of this frame. 2) an index of the access point that this frame belongs.
- Each frame is a variable size, so computing the entry point when switching from fast forward or reverse to normal play cannot be a simple division.
- Each access point may have a variable number of frames so an index into the access points will result in an error. Instead the starting position is computed in frames and this index is used to map a specific frame to the access point that contains it.
- the above-described invention advantageously maximizes both link utilization and video quality by preferentially serving VBR content to a plurality of subscribers. Moreover, such maximization is achieved without processing the VBR or CLBR streams below (in the case of MPEG-like streams) the transport packet level. Even under heavy user demand, the video quality of one or mores streams may be reduced without significant visual artifacts (i.e., without 'glitches'). In this manner, costly link bandwidth (which is typically more expensive then disk bandwidth) may be preserved without resorting to "packet dropping" or other undesirable techniques.
Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99943973A EP1099336A1 (en) | 1998-09-03 | 1999-09-01 | Method and apparatus for processing variable bit rate information in an information distribution system |
CA002342906A CA2342906C (en) | 1998-09-03 | 1999-09-01 | Method and apparatus for processing variable bit rate information in an information distribution system |
AU56959/99A AU5695999A (en) | 1998-09-03 | 1999-09-01 | Method and apparatus for processing variable bit rate information in an information distribution system |
JP2000569571A JP4508422B2 (en) | 1998-09-03 | 1999-09-01 | Method and apparatus for processing variable bit rate information in an information distribution system |
BR9914486-7A BR9914486A (en) | 1998-09-03 | 1999-09-01 | Method and apparatus for processing variable bit rate information in an information distribution system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/148,020 US6298071B1 (en) | 1998-09-03 | 1998-09-03 | Method and apparatus for processing variable bit rate information in an information distribution system |
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AU (1) | AU5695999A (en) |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1233622A2 (en) * | 2000-12-07 | 2002-08-21 | Matsushita Electric Industrial Co., Ltd. | Transmission rate control method |
JP2002290974A (en) * | 2000-12-07 | 2002-10-04 | Matsushita Electric Ind Co Ltd | Transmission rate control method |
EP1298931A2 (en) * | 2001-09-20 | 2003-04-02 | Oplayo Oy | Adaptive media stream |
US8302144B2 (en) * | 2002-03-13 | 2012-10-30 | Cox Communications, Inc. | Distribution of content in an information distribution system |
Families Citing this family (85)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7086077B2 (en) * | 1999-04-01 | 2006-08-01 | Sedna Patent Services, Llc | Service rate change method and apparatus |
US6574279B1 (en) * | 2000-02-02 | 2003-06-03 | Mitsubishi Electric Research Laboratories, Inc. | Video transcoding using syntactic and semantic clues |
US7035468B2 (en) * | 2001-04-20 | 2006-04-25 | Front Porch Digital Inc. | Methods and apparatus for archiving, indexing and accessing audio and video data |
US7913287B1 (en) * | 2001-06-15 | 2011-03-22 | Decisionmark Corp. | System and method for delivering data over an HDTV digital television spectrum |
US7330900B2 (en) * | 2001-07-06 | 2008-02-12 | Dialogic Corporation | Low-latency packet processor |
GB2377840A (en) * | 2001-07-18 | 2003-01-22 | Sony Uk Ltd | Audio/video recording and multiplexing apparatus |
US6914936B1 (en) * | 2001-07-19 | 2005-07-05 | Bigband Networks, Inc. | Method for allocating media unit sequences among a plurality of output channels |
US20030046704A1 (en) * | 2001-09-05 | 2003-03-06 | Indra Laksono | Method and apparatus for pay-per-quality of service for bandwidth consumption in a video system |
KR100460529B1 (en) * | 2001-11-15 | 2004-12-08 | 박홍성 | Filtering system and method for streaming of data over wireless network |
KR100444143B1 (en) * | 2001-12-29 | 2004-08-09 | 주식회사 윈컴소프트 | System and method for providing vod stream service using a vbr |
KR100453505B1 (en) * | 2002-04-03 | 2004-10-20 | 주식회사 케이티프리텔 | Method and device for controlling multi-bit-rate of streaming by clietns in wireless network |
US8397269B2 (en) * | 2002-08-13 | 2013-03-12 | Microsoft Corporation | Fast digital channel changing |
US7523482B2 (en) * | 2002-08-13 | 2009-04-21 | Microsoft Corporation | Seamless digital channel changing |
US6952821B2 (en) * | 2002-08-19 | 2005-10-04 | Hewlett-Packard Development Company, L.P. | Method and system for memory management optimization |
US7484079B2 (en) * | 2002-10-31 | 2009-01-27 | Hewlett-Packard Development Company, L.P. | Pipeline stage initialization via task frame accessed by a memory pointer propagated among the pipeline stages |
US7363459B2 (en) * | 2002-10-31 | 2008-04-22 | Hewlett-Packard Development Company, L.P. | System and method of optimizing memory usage with data lifetimes |
US7107199B2 (en) * | 2002-10-31 | 2006-09-12 | Hewlett-Packard Development Company, L.P. | Method and system for the design of pipelines of processors |
US7603689B2 (en) * | 2003-06-13 | 2009-10-13 | Microsoft Corporation | Fast start-up for digital video streams |
US7444419B2 (en) * | 2003-10-10 | 2008-10-28 | Microsoft Corporation | Media stream scheduling for hiccup-free fast-channel-change in the presence of network chokepoints |
US7562375B2 (en) * | 2003-10-10 | 2009-07-14 | Microsoft Corporation | Fast channel change |
AU2004297923B2 (en) * | 2003-11-26 | 2008-07-10 | Cisco Technology, Inc. | Method and apparatus to inline encryption and decryption for a wireless station |
US6954450B2 (en) * | 2003-11-26 | 2005-10-11 | Cisco Technology, Inc. | Method and apparatus to provide data streaming over a network connection in a wireless MAC processor |
US7430222B2 (en) * | 2004-02-27 | 2008-09-30 | Microsoft Corporation | Media stream splicer |
US7624021B2 (en) * | 2004-07-02 | 2009-11-24 | Apple Inc. | Universal container for audio data |
WO2006126859A2 (en) * | 2005-05-26 | 2006-11-30 | Lg Electronics Inc. | Method of encoding and decoding an audio signal |
JP5227794B2 (en) * | 2005-06-30 | 2013-07-03 | エルジー エレクトロニクス インコーポレイティド | Apparatus and method for encoding and decoding audio signals |
AU2006266655B2 (en) * | 2005-06-30 | 2009-08-20 | Lg Electronics Inc. | Apparatus for encoding and decoding audio signal and method thereof |
US8185403B2 (en) * | 2005-06-30 | 2012-05-22 | Lg Electronics Inc. | Method and apparatus for encoding and decoding an audio signal |
US7788107B2 (en) | 2005-08-30 | 2010-08-31 | Lg Electronics Inc. | Method for decoding an audio signal |
US8577483B2 (en) * | 2005-08-30 | 2013-11-05 | Lg Electronics, Inc. | Method for decoding an audio signal |
KR20080049735A (en) * | 2005-08-30 | 2008-06-04 | 엘지전자 주식회사 | Method and apparatus for decoding an audio signal |
WO2007027051A1 (en) * | 2005-08-30 | 2007-03-08 | Lg Electronics Inc. | Apparatus for encoding and decoding audio signal and method thereof |
WO2007040363A1 (en) * | 2005-10-05 | 2007-04-12 | Lg Electronics Inc. | Method and apparatus for signal processing and encoding and decoding method, and apparatus therefor |
US7646319B2 (en) * | 2005-10-05 | 2010-01-12 | Lg Electronics Inc. | Method and apparatus for signal processing and encoding and decoding method, and apparatus therefor |
US7696907B2 (en) | 2005-10-05 | 2010-04-13 | Lg Electronics Inc. | Method and apparatus for signal processing and encoding and decoding method, and apparatus therefor |
US7672379B2 (en) * | 2005-10-05 | 2010-03-02 | Lg Electronics Inc. | Audio signal processing, encoding, and decoding |
KR100857115B1 (en) * | 2005-10-05 | 2008-09-05 | 엘지전자 주식회사 | Method and apparatus for signal processing and encoding and decoding method, and apparatus therefor |
US7751485B2 (en) * | 2005-10-05 | 2010-07-06 | Lg Electronics Inc. | Signal processing using pilot based coding |
US7742913B2 (en) * | 2005-10-24 | 2010-06-22 | Lg Electronics Inc. | Removing time delays in signal paths |
US8135040B2 (en) * | 2005-11-30 | 2012-03-13 | Microsoft Corporation | Accelerated channel change |
US7752053B2 (en) * | 2006-01-13 | 2010-07-06 | Lg Electronics Inc. | Audio signal processing using pilot based coding |
US7716389B1 (en) * | 2006-03-17 | 2010-05-11 | Bitmicro Networks, Inc. | Direct memory access controller with encryption and decryption for non-blocking high bandwidth I/O transactions |
US8165301B1 (en) | 2006-04-04 | 2012-04-24 | Bitmicro Networks, Inc. | Input-output device and storage controller handshake protocol using key exchange for data security |
US9826197B2 (en) | 2007-01-12 | 2017-11-21 | Activevideo Networks, Inc. | Providing television broadcasts over a managed network and interactive content over an unmanaged network to a client device |
US20080201736A1 (en) * | 2007-01-12 | 2008-08-21 | Ictv, Inc. | Using Triggers with Video for Interactive Content Identification |
EP3511841B1 (en) | 2007-11-16 | 2021-07-21 | DivX, LLC | Chunk header incorporating binary flags and correlated variable-length fields |
US8959307B1 (en) | 2007-11-16 | 2015-02-17 | Bitmicro Networks, Inc. | Reduced latency memory read transactions in storage devices |
KR100948840B1 (en) * | 2007-12-17 | 2010-03-22 | 한국전자통신연구원 | An audio codec bit-rate control method to assure the QoS of the voice in WLAN |
CA2728797A1 (en) * | 2008-06-25 | 2010-04-22 | Activevideo Networks, Inc. | Providing television broadcasts over a managed network and interactive content over an unmanaged network to a client device |
AU2010202034B1 (en) * | 2010-04-07 | 2010-12-23 | Limelight Networks, Inc. | Partial object distribution in content delivery network |
US8966003B2 (en) * | 2008-09-19 | 2015-02-24 | Limelight Networks, Inc. | Content delivery network stream server vignette distribution |
AU2010276462B1 (en) | 2010-12-27 | 2012-01-12 | Limelight Networks, Inc. | Partial object caching |
US8631145B2 (en) * | 2008-10-31 | 2014-01-14 | Sonic Ip, Inc. | System and method for playing content on certified devices |
US9135190B1 (en) | 2009-09-04 | 2015-09-15 | Bitmicro Networks, Inc. | Multi-profile memory controller for computing devices |
US8665601B1 (en) | 2009-09-04 | 2014-03-04 | Bitmicro Networks, Inc. | Solid state drive with improved enclosure assembly |
US8447908B2 (en) | 2009-09-07 | 2013-05-21 | Bitmicro Networks, Inc. | Multilevel memory bus system for solid-state mass storage |
US8560804B2 (en) * | 2009-09-14 | 2013-10-15 | Bitmicro Networks, Inc. | Reducing erase cycles in an electronic storage device that uses at least one erase-limited memory device |
US8776109B2 (en) * | 2010-10-21 | 2014-07-08 | Sling Media Pvt Ltd | Handling disruption in content streams received at a player from a content retransmitter |
US9372755B1 (en) | 2011-10-05 | 2016-06-21 | Bitmicro Networks, Inc. | Adaptive power cycle sequences for data recovery |
US9392304B2 (en) | 2012-02-29 | 2016-07-12 | Hulu, LLC | Encoding optimization using quality level of encoded segments |
US9043669B1 (en) | 2012-05-18 | 2015-05-26 | Bitmicro Networks, Inc. | Distributed ECC engine for storage media |
WO2014108738A1 (en) * | 2013-01-08 | 2014-07-17 | Nokia Corporation | Audio signal multi-channel parameter encoder |
US9423457B2 (en) | 2013-03-14 | 2016-08-23 | Bitmicro Networks, Inc. | Self-test solution for delay locked loops |
US9720603B1 (en) | 2013-03-15 | 2017-08-01 | Bitmicro Networks, Inc. | IOC to IOC distributed caching architecture |
US9934045B1 (en) | 2013-03-15 | 2018-04-03 | Bitmicro Networks, Inc. | Embedded system boot from a storage device |
US9734067B1 (en) | 2013-03-15 | 2017-08-15 | Bitmicro Networks, Inc. | Write buffering |
US9400617B2 (en) | 2013-03-15 | 2016-07-26 | Bitmicro Networks, Inc. | Hardware-assisted DMA transfer with dependency table configured to permit-in parallel-data drain from cache without processor intervention when filled or drained |
US9875205B1 (en) | 2013-03-15 | 2018-01-23 | Bitmicro Networks, Inc. | Network of memory systems |
US9672178B1 (en) | 2013-03-15 | 2017-06-06 | Bitmicro Networks, Inc. | Bit-mapped DMA transfer with dependency table configured to monitor status so that a processor is not rendered as a bottleneck in a system |
US9971524B1 (en) | 2013-03-15 | 2018-05-15 | Bitmicro Networks, Inc. | Scatter-gather approach for parallel data transfer in a mass storage system |
US9916213B1 (en) | 2013-03-15 | 2018-03-13 | Bitmicro Networks, Inc. | Bus arbitration with routing and failover mechanism |
US9798688B1 (en) | 2013-03-15 | 2017-10-24 | Bitmicro Networks, Inc. | Bus arbitration with routing and failover mechanism |
US9430386B2 (en) | 2013-03-15 | 2016-08-30 | Bitmicro Networks, Inc. | Multi-leveled cache management in a hybrid storage system |
US10120694B2 (en) | 2013-03-15 | 2018-11-06 | Bitmicro Networks, Inc. | Embedded system boot from a storage device |
US9842024B1 (en) | 2013-03-15 | 2017-12-12 | Bitmicro Networks, Inc. | Flash electronic disk with RAID controller |
US9501436B1 (en) | 2013-03-15 | 2016-11-22 | Bitmicro Networks, Inc. | Multi-level message passing descriptor |
US10489318B1 (en) | 2013-03-15 | 2019-11-26 | Bitmicro Networks, Inc. | Scatter-gather approach for parallel data transfer in a mass storage system |
US9911423B2 (en) | 2014-01-13 | 2018-03-06 | Nokia Technologies Oy | Multi-channel audio signal classifier |
US9952991B1 (en) | 2014-04-17 | 2018-04-24 | Bitmicro Networks, Inc. | Systematic method on queuing of descriptors for multiple flash intelligent DMA engine operation |
US10025736B1 (en) | 2014-04-17 | 2018-07-17 | Bitmicro Networks, Inc. | Exchange message protocol message transmission between two devices |
US10042792B1 (en) | 2014-04-17 | 2018-08-07 | Bitmicro Networks, Inc. | Method for transferring and receiving frames across PCI express bus for SSD device |
US9811461B1 (en) | 2014-04-17 | 2017-11-07 | Bitmicro Networks, Inc. | Data storage system |
US10078604B1 (en) | 2014-04-17 | 2018-09-18 | Bitmicro Networks, Inc. | Interrupt coalescing |
US10055150B1 (en) | 2014-04-17 | 2018-08-21 | Bitmicro Networks, Inc. | Writing volatile scattered memory metadata to flash device |
US10552050B1 (en) | 2017-04-07 | 2020-02-04 | Bitmicro Llc | Multi-dimensional computer storage system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5541852A (en) * | 1994-04-14 | 1996-07-30 | Motorola, Inc. | Device, method and system for variable bit-rate packet video communications |
EP0798924A2 (en) * | 1996-03-29 | 1997-10-01 | Mitsubishi Denki Kabushiki Kaisha | System for delivering video data |
WO1997039584A1 (en) * | 1996-04-12 | 1997-10-23 | Imedia Corporation | Video transcoder |
WO1998004975A2 (en) * | 1996-07-30 | 1998-02-05 | Philips Electronics N.V. | Bandwidth regulation system for multichannel memory arrays |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5579527A (en) * | 1992-08-05 | 1996-11-26 | David Sarnoff Research Center | Apparatus for alternately activating a multiplier and a match unit |
JP3123290B2 (en) | 1993-03-09 | 2001-01-09 | ソニー株式会社 | Compressed data recording device and method, compressed data reproducing method, recording medium |
US5671377A (en) * | 1994-07-19 | 1997-09-23 | David Sarnoff Research Center, Inc. | System for supplying streams of data to multiple users by distributing a data stream to multiple processors and enabling each user to manipulate supplied data stream |
EP0714192A1 (en) | 1994-11-24 | 1996-05-29 | International Business Machines Corporation | Method for preempting connections in high speed packet switching networks |
US5533009A (en) * | 1995-02-03 | 1996-07-02 | Bell Communications Research, Inc. | Bandwidth management and access control for an ATM network |
US5621660A (en) | 1995-04-18 | 1997-04-15 | Sun Microsystems, Inc. | Software-based encoder for a software-implemented end-to-end scalable video delivery system |
US5991811A (en) * | 1995-09-04 | 1999-11-23 | Kabushiki Kaisha Toshiba | Information transmission system utilizing both real-time data transmitted in a normal-in-time direction and in a retrospective-in-time direction |
US5819036A (en) * | 1995-12-14 | 1998-10-06 | Time Warner Cable | Method for message addressing in a full service network |
US6014694A (en) | 1997-06-26 | 2000-01-11 | Citrix Systems, Inc. | System for adaptive video/audio transport over a network |
-
1998
- 1998-09-03 US US09/148,020 patent/US6298071B1/en not_active Expired - Lifetime
-
1999
- 1999-09-01 CA CA002342906A patent/CA2342906C/en not_active Expired - Lifetime
- 1999-09-01 WO PCT/US1999/019656 patent/WO2000014953A1/en active IP Right Grant
- 1999-09-01 AU AU56959/99A patent/AU5695999A/en not_active Abandoned
- 1999-09-01 KR KR1020017002833A patent/KR100682683B1/en not_active IP Right Cessation
- 1999-09-01 JP JP2000569571A patent/JP4508422B2/en not_active Expired - Fee Related
- 1999-09-01 BR BR9914486-7A patent/BR9914486A/en not_active Application Discontinuation
- 1999-09-01 EP EP99943973A patent/EP1099336A1/en not_active Withdrawn
-
2001
- 2001-08-08 US US09/925,216 patent/US7167488B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5541852A (en) * | 1994-04-14 | 1996-07-30 | Motorola, Inc. | Device, method and system for variable bit-rate packet video communications |
EP0798924A2 (en) * | 1996-03-29 | 1997-10-01 | Mitsubishi Denki Kabushiki Kaisha | System for delivering video data |
WO1997039584A1 (en) * | 1996-04-12 | 1997-10-23 | Imedia Corporation | Video transcoder |
WO1998004975A2 (en) * | 1996-07-30 | 1998-02-05 | Philips Electronics N.V. | Bandwidth regulation system for multichannel memory arrays |
Non-Patent Citations (3)
Title |
---|
FARBER N ET AL: "Robust H.263 compatible video transmission for mobile access to video servers", PROCEEDINGS. INTERNATIONAL CONFERENCE ON IMAGE PROCESSING (CAT. NO.97CB36144), PROCEEDINGS OF INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, SANTA BARBARA, CA, USA, 26-29 OCT. 1997, 1997, Los Alamitos, CA, USA, IEEE Comput. Soc, USA, pages 73 - 76 vol.2, XP002124858, ISBN: 0-8186-8183-7 * |
GIROD B ET AL: "A scalable codec for Internet video streaming", 1997 13TH INTERNATIONAL CONFERENCE ON DIGITAL SIGNAL PROCESSING PROCEEDINGS. DSP 97 (CAT. NO.97TH8306), PROCEEDINGS OF 13TH INTERNATIONAL CONFERENCE ON DIGITAL SIGNAL PROCESSING, SANTORINI, GREECE, 2-4 JULY 1997, 1997, New York, NY, USA, IEEE, USA, pages 221 - 224 vol.1, XP002124860, ISBN: 0-7803-4137-6 * |
GIROD B ET AL: "Scalable codec architectures for Internet video-on-demand", CONFERENCE RECORD OF THE THIRTY-FIRST ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS (CAT. NO.97CB36136), CONFERENCE RECORD OF THE THIRTY-FIRST ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS (CAT. NO.97CB36163), PACIFIC GROVE, CA, USA,, 2 November 1997 (1997-11-02) - 5 November 1997 (1997-11-05), 1998, Los Alamitos, CA, USA, IEEE Comput. Soc, USA, pages 357 - 361 vol.1, XP002124859, ISBN: 0-8186-8316-3 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1233622A2 (en) * | 2000-12-07 | 2002-08-21 | Matsushita Electric Industrial Co., Ltd. | Transmission rate control method |
JP2002290974A (en) * | 2000-12-07 | 2002-10-04 | Matsushita Electric Ind Co Ltd | Transmission rate control method |
EP1233622A3 (en) * | 2000-12-07 | 2004-06-09 | Matsushita Electric Industrial Co., Ltd. | Transmission rate control method |
EP1298931A2 (en) * | 2001-09-20 | 2003-04-02 | Oplayo Oy | Adaptive media stream |
EP1298931A3 (en) * | 2001-09-20 | 2003-05-14 | Oplayo Oy | Adaptive media stream |
US8302144B2 (en) * | 2002-03-13 | 2012-10-30 | Cox Communications, Inc. | Distribution of content in an information distribution system |
Also Published As
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KR100682683B1 (en) | 2007-02-15 |
AU5695999A (en) | 2000-03-27 |
JP4508422B2 (en) | 2010-07-21 |
EP1099336A1 (en) | 2001-05-16 |
CA2342906C (en) | 2004-10-26 |
US20010055302A1 (en) | 2001-12-27 |
BR9914486A (en) | 2002-06-18 |
KR20010073119A (en) | 2001-07-31 |
JP2002524982A (en) | 2002-08-06 |
US6298071B1 (en) | 2001-10-02 |
US7167488B2 (en) | 2007-01-23 |
CA2342906A1 (en) | 2000-03-16 |
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