Video processing system and transcoder for use with layered video coding and methods for use therewith
A video processing system includes a video transcoder that receives a independent video layer stream and a first dependent video layer stream that requires the independent video layer for decoding, the video transcoder generating a transcoded video signal based at least one of the independent video stream and the dependent video layer stream.
1. A video processing system comprising:
a transceiver configured to transmit a video signal to a receiving device via one or more RF channels; and
a control module, coupled to the transceiver, configured to detect a channel characteristic indicative of an ability of the one or more RF channels to deliver the video signal to the receiving device; and
a video selection module communicatively coupled to the transceiver to select, in accordance with the channel characteristic, a first digital format of the video signal to be transmitted by the transceiver to the receiving device;
wherein the video signal is generated in the first digital format by transcoding from a second digital format wherein the second digital format includes a plurality of video streams including a base layer stream and at least one additional layer stream that enhances the base layer stream and wherein the transcoding includes synchronizing and combining selected ones of the plurality of video streams.
2. The system of claim 1 , wherein the channel characteristic comprises at least one of: signal-to-noise ratio, signal strength, signal-to-noise and interference ratio, or a reception parameter.
3. The system of claim 1 , wherein the channel characteristic comprises at least one of: bit error rate, packet error rate, throughput, or packet retransmission rate.
4. The system of claim 1 , wherein the control module is configured to select a transmission parameter for transmitting the video signal in accordance with the detected channel characteristic.
5. The system of claim 4 , wherein the transmission parameter comprises at least one of: modulation spectral densities, data rate, or forward error correction code.
6. The system of claim 4 , wherein the transmission parameter comprises a multi-input multi-output (MIMO) transmission parameter.
7. The system of claim 1 , wherein the transceiver comprises a multi-input multi-output (MIMO) transceiver.
8. The system of claim 7 , wherein the MIMO transceiver is configured to select a subset of MIMO channels for transmitting the video.
9. The system of claim 1 , wherein the base layer stream comprises most significant bits of motion vector data; and the at least one additional layer stream comprises least significant bits of the motion vectors.
10. The system of claim 1 , wherein the base layer stream comprises grayscale data; and the at least one additional layer stream comprises color data referenced to the grayscale data.
11. The system of claim 1 , wherein the base layer stream comprises a low resolution signal; and the at least one additional layer stream comprises data to enhance the low resolution signal.
12. A method performed by a video processing system comprising:
receiving a video signal that includes input video streams, wherein the input video streams include a base layer stream and at least one additional layer stream that enhances the base layer stream;
detecting a channel characteristic indicative of an ability of one or more RF channels to deliver the video signal to a receiving device;
selecting a first digital video format for the video signal based on the channel characteristic;
wherein a plurality of input video streams include a base layer stream and at least one additional layer stream that enhances the base layer stream;
wherein a transcoded video signal is generated from the plurality of input video streams by synchronizing and combining selected ones of the plurality of input video streams to generate the transcoded video signal in the first digital video format; and
wherein the transcoded video signal is transmitted from a transceiver to the receiving device.
13. The method of claim 12 , wherein the at least one additional layer stream includes a plurality of additional layer streams and generating the transcoded video signal further comprises:
combining the base layer stream and the plurality of additional layer streams.
14. The method of claim 13 , further comprising:
modifying at least one of the base layer stream and the at least one additional layer stream prior to combining the base layer stream and the at least one additional layer stream.
15. The method of claim 12 , wherein the base layer stream includes an integer portion of motion vector data and the at least one additional layer stream includes a fractional portion of the motion vector data.
16. The method of claim 12 , wherein generating the transcoded video signal further comprises:
transcoding the input video streams to change at least one of frame rate, resolution, and color scale.
17. A wireless access device comprising:
a transceiver configured to communicate with a receiving device by performing operations comprising:
connecting the receiving device to a network;
transmitting a video signal over one or more radio frequency (RF) channels to the receiving device;
a control module, coupled to the transceiver, configured to detect a channel characteristic indicative of an ability of the one or more RF channels to deliver the video signal to the receiving device; and
a video selection module coupled to the transceiver to select, in accordance with the channel characteristic, a first digital format of the video signal to be transmitted by the transceiver to the receiving device;
wherein the video signal is generated in the first digital format by transcoding from a second digital format wherein the second digital format includes a plurality of video streams including a base layer stream and at least one additional layer stream that enhances the base layer stream and wherein the transcoding includes synchronizing and combining selected ones of the plurality of video streams.
18. The wireless access device of claim 17 , wherein the transceiver is configured to communicate with the receiving device over a cellular network or a wireless local area network.
19. The wireless access device of claim 17 , wherein the at least one additional layer stream includes a plurality of additional layer streams and generating the video signal further comprises:
combining the base layer stream and the plurality of additional layer streams.
20. The wireless access device of claim 17 , further comprising:
modifying at least one of the base layer stream and the at least one additional layer stream prior to combining the base layer stream and the at least one additional layer stream.