Excess bitrate distribution based on quality gain in sabr server
A method provides for delivering video content from a server to a plurality of media devices is disclosed that distributes accurately excess bandwidth. The method includes: determining, by the server, the bandwidth to allocate to each of the plurality of media devices using a hypertext transfer protocol-based live streaming client model or a need parameter vector and/or measured bandwidth limitations associated with each of the plurality of media devices and providing the allocated bandwidth to each of the plurality of media devices, wherein the video content is transmitted in a plurality of segments from the server, and wherein each segment is transmitted at a bitrate that may vary from segment to segment.
1. A method for providing video content comprising:
providing a HyperText Transfer Protocol-based live streaming client model (“HCM′), determining a bandwidth to allocate to a plurality of media devices using the HCM that is made up of a state-based HCM that is constructed for each of the plurality of media devices;
determining bandwidth constraints associated with each of said plurality of media devices;
determining a number of active media devices associated with the plurality of media devices to allocate the determined bandwidth;
for each respective one of the plurality of active media devices, determining a need parameter vector (“NPV”) and assigning a fraction of the bandwidth to each respective active media device in the plurality of media devices based, at least in part, on: (i) said bandwidth constraints associated with each respective active media device; (ii) measured rates at which video luma Peak Signal to Noise Ratio (PSNR) changes as a function of video bitrate for content delivered to each respective active media device; and (iii) the NPV varied by a scalar quality value for each respective active media device using the HCM construct for each active media device.
2. The method of claim 1 wherein the NPV is based or one or more of the following: video complexity, device profile, service priority level, and codec profile.
3. The method of claim 2 wherein video complexity is derived from video content as an estimation of a complexity of the video content.
4. The method of claim 1 wherein the NPV is computed based on a complexity of video content for each segment.
5. The method of claim 2 wherein the NPV is based on device profile.
6. The method of claim 5 wherein the device profile indicates that an active device is undergoing a transition period requiring a modification to the bandwidth assigned to the active device.
7. The method of claim 6 wherein the transition period is one or more of the following: a channel change, a pause or resume, a seek, a complete, and a join.
8. The method of claim 1 further comprising:
determining an adjustment factor for assigning the fraction of the bandwidth to each active media device.
9. The method of claim 8 wherein the adjustment factor is based on one or more of the following: the NPV for an active media device is over budget, the NPV for an active media device is under budget, an active media device completes playback, and a bottleneck occurs at an active media device.
10. The method of claim 1 wherein the HCM provides an estimate of a fullness of a media-device buffer.
11. The method of claim 1 wherein the determined bandwidth to allocate to each of the plurality of media devices prevents a media device from buffering content already received from a server.