> > > Also the speed benefits are tiny overall, sub-1%. > > This claim is not supported by the statistics you posted >
For the overall decoding of MPEG-2 the VLC/dequant functions take up roughly 30% of decoding time. FAST vs normal is about 2% faster on the VLC/dequant functions, therefore the total speed benefit of FAST is sub-1% for MPEG-2. > > Removing it and some > > other small changes to the existing code will make the existing code run > at > > the same speed. > > its a long time since we had mpeg1/2 optimizations > iam very happy about this being speed up more. > If you manage to make it as fast as fast mode i surely would be happy > If you manage to make the difference shrink by half i too would be happy. > Faster decoding of mainstream codecs is a good thing. It has many > advantages ... > Part of the speed difference is the if(FLAGS2 & FAST) branch being gone on each macroblock. However, if you are not willing to remove FAST I don't see the point of continuing. You have free reign to "optimise" FAST to justify its existence as it doesn't have to conform to any spec. Kieran _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
