On Tue, Jul 25, 2023 at 7:18 AM Thilo Borgmann <thilo.borgm...@mail.de> wrote: > > Am 25.07.23 um 14:24 schrieb Tomas Härdin: > >> + // Extremely simplified key frame detection: > >> + // - the first frame (containing headers) is marked as a key > >> frame > >> + // - other frames are marked as non-key frames > > > > Is there a more proper way of doing this? > > All frames (except the ANMF chunks) are INTRA, and all of them have a WEBP > tag. > Whereas all ANMF chunks are in the same WEBP chunk as their reference frame. > So it should really be as simple as it is to mark all WEBP frames as key > frames as the code does. > What more dedicated do you have in mind? > > The logic as-is works with all samples I have, animated and not. > Seems to also align well with their example file layouts. > You have a more weird one? > > > > Looking briefly at the spec > > one wonders why they didn't just use regular VP* inter frames.. > > I assume the whole canvas idea could be more beneficial than vp8 inter - but > otoh I don't know about vp8 compositing capabilities, if any.. >
This was more in alignment with gif and allowed for a simpler reference structure. WebP also supports lossless and mixing lossy/lossless so this method makes the behavior consistent between VP8 and VP8L. _______________________________________________ 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".