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Packing bitstream on-the-fly with delayed context updates
Produce the token partitions on-the-fly, while processing each MB. Context is updated at the beginning of each frame based on the previoud frame's counters. Optimally encoder outputs partitions in separate buffers. For frame based output, partitions are concatenated internally. Limitations: - enabled just in combination with realtime-only mode - number of encoding threads has to be equal or less than the number of token partitions. For this reason, by default the encoder will do 8 token partitions. - vpxenc supports partition output (-P) just in combination with IVF output format (--ivf) Performance: - Realtime encoder can be up to 13% faster (ARM) depending on the number of threads and bitrate settings. Constant gain over the 5-16 speed range. - Token buffer reduced from one frame to 8 MBs Quality: - quality is affected by the delayed context updates. This again dependents on input material, speed and bitrate settings. For VC style input the loss seen is up to 0.2dB. If error-resilient=2 mode is used than the effect of this change is negligible. Example: ./configure --enable-realtime-only --enable-onthefly-bitpacking ./vpxenc --rt --end-usage=1 --fps=30000/1000 -w 640 -h 480 --target-bitrate=1000 --token-parts=3 --static-thresh=2000 --ivf -P -t 4 -o strm.ivf tanya_640x480.yuv Change-Id: I127295cb85b835fc287e1c0201a67e378d025d76
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Attila Nagy
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Yunqing Wang
committed
Feb 29, 2012
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