> On Dec 8, 2015, at 5:15 AM, Kieran O Leary <kieran.o.le...@gmail.com> wrote: > > On Thu, Nov 26, 2015 at 11:35 AM, Abhishek Prasad > <abhishek.pra...@efxmagic.com> wrote: > >> After encoding a dpx sequence to avi/mxf with FFv1. How does one >> decode/restore back to the dpx files? > >> ----- > > Did you say that you encoded ffv1 in an mxf wrapper? Is that even > possible, and if so, what was your command line output?
That is not possible yet. There were some discussions about it, but the effort would require registering a universal label and publishing a SMPTE document that documents the storage of FFV1 within MXF. > It is indeed possible to decode back to DPX- I've losslessly > compressed 10bit RGB DPX to FFV1.mkv and back with matching framemd5s > all the way. It's a beautiful thing. But it's some context loss. For instance if the source DPX is logarithmic I'd be skeptical that the ffv1.mkv rendition would present logarithmically. > I've included an audio argument > which is optional, just remove it if you're silent. IIRC, in ffmpeg options for non-existant tracks are ignored, so you may be able to leave the audio arguments in for media with no audio tracks. > I've added > framemd5s as well. I never losslessly compress/transcode without > running a diff on the framemd5s of the source and output. Replace your > startnumber and filename as applies to you. Right. Using framemd5s is recommend for verifying losslessness. It prevents finding images like this: https://twitter.com/dericed/status/483626811356893184 <https://twitter.com/dericed/status/483626811356893184>. Dave Rice > ffmpeg -i input.avi output06%d -f framemd5 -an framemd5.md5 > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
