On Mon, 7 Jan 2019 13:44:56 +0100 Michael Niedermayer <mich...@niedermayer.cc> wrote:
> > The modern approaches, DCT, FFT, wavelets and such transforms, are all > > likely too slow to decode. > > you said it can do mpeg1 and xvid, these are DCT based > have you tried H.264 ? (i imagine that might with asm optimizations > and avoidance of more complex features like CABAC and the loop filter > work maybe, maybe not) > also if h.264 with everything disabled works maybe some features can > be turned on sometimes like the loop filter for key frames, that > might then help compression ... > > and beating an existing codec, while certainly possible might be hard According to a 2010 comparison https://keyj.emphy.de/video-encoder-comparison/ x264 constrained baseline (everything off) takes something like 30% longer to decode vs xvid at the same rate. Probably more because that site used xvid's full features, while I used it "everything off". The issue with xvid simple and mpeg1 were that they were slightly too slow, and looked too bad. The platform does not have any SIMD, so I doubt asm optimizations will help much. Cinepak is almost 30 years old, surely it should be possible to match the decoding & quality, but at a 5x lower bitrate :P - Lauri _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel