On Tue, Jul 10, 2018 at 12:29 AM Baptiste Coudurier <baptiste.coudur...@gmail.com> wrote: > > Hi James, > > On Mon, Jul 9, 2018 at 11:26 AM, James Almer <jamr...@gmail.com> wrote: > > [...] > > > > @@ -5438,7 +5461,7 @@ int ff_mov_write_packet(AVFormatContext *s, > > AVPacket *pkt) > > av_log(s, AV_LOG_WARNING, "pts has no value\n"); > > pkt->pts = pkt->dts; > > } > > - if (pkt->dts != pkt->pts) > > + if (pkt->dts != pkt->pts && par->codec_id != AV_CODEC_ID_AV1) > > trk->flags |= MOV_TRACK_CTTS; > > trk->cluster[trk->entry].cts = pkt->pts - pkt->dts; > > trk->cluster[trk->entry].flags = 0; > > > > [...] > > Interesting, is there a spec document that would explicitly mention that > AV1 forbids "ctts" atom ? >
The draft spec does: https://aomediacodec.github.io/av1-isobmff/#sampleformat Unlike many video standards, AV1 does not distinguish the display order from the decoding order, but achieves similar effects by grouping multiple frames within a sample. Therefore, composition offsets are not used. In tracks using the AV1SampleEntry, the ctts box and composition offsets in movie fragments SHALL NOT be used. - Hendrik _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
