> Am 19.12.2019 um 22:46 schrieb Jun Li <junli1...@gmail.com>: > > On Thu, Dec 19, 2019 at 4:00 AM Daniel Oberhoff < > danieloberh...@googlemail.com> wrote: > >> Hello. >> >> I have been diving deep into the mp4 spec to understand fragmented mp4. >> From what I understand using moof atoms it is possible, given stream >> compatibility, to straight append to an mp4 file by appending moof+mdat >> pairs. Can ffmpeg or libavformat be somehow used to achieve that? > > > I use the command line like " ffmpeg -i test.mp4 -codec copy -f mp4 > -movflags empty_moov+frag_keyframe+skip_trailer out.mp4". > It generates fmp4 with atiom : ftyp+moov+[moof+mdata]*
Ok, yeah, and to really spend that to an existing file I’d have to filter out the ftyp/moov via a custom output callback. That was my idea too. Just hoped I could avoid the complex stream filtering , but I guess it’s the only way short of hacking libavformat. Best Daniel _______________________________________________ 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".
