On 7/9/2018 7:23 PM, Baptiste Coudurier 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 ? > > Thanks!
Yes, 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. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2." _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
