Hi Ben! 2018-12-07 19:23 GMT+01:00, Benjamin Turkus <[email protected]>:
> I've been transcoding a bunch of v210/pcm quicktime files to ffv1/pcm mkv, > and I keep receiving "Non-monotonous DTS in output stream 0:1" messages, > and sometimes even "DTS out of order" warnings. I can't find any reason why > the errors are occurring when they do, but I'm assuming there's something > funky is going on in the originals. I've dug through the list-serv, but > most of the advice that I've found seems to focus on concat-related DTS > issues. > > While there doesn't seem to be anything wrong with the resulting mkvs, I'm > wondering if there might be a better way to smooth out whatever's going on > during the transcode. I've played around with things like "-fflags > +genpts+igndts," but haven't noticed any improvement. > And when I add in a > "-af aresample=async=1," it does seem to get rid the "non-monotonous" > message, but I still get a "DTS out of order." This cannot have much effect because of "-acodec copy". > Any advice or thoughts—about what's going on with these files, or a > different transcoding approach—would be appreciated. Rights issues could > make sharing samples a little tricky, but I might be able to make it happen. > Without async > (is there such a thing as too uncut? Apologies): No! (In reality: Of course, but users can only be flamed for too cut, not too uncut.) > pamis-iMac:dts pamiaudio$ ffmpeg -i mao_212027_v01_pm.mov -map 0 -dn -c:v > ffv1 -level 3 -coder 1 -context 1 -g 1 -slicecrc 1 -slices 24 -field_order > bt -vf setfield=bff,setdar=4/3 -color_primaries smpte170m -color_range tv > -color_trc bt709 -colorspace smpte170m -c:a copy mao_212027_v01_pm.mkv You can test "-acodec pcm_s24le" instead of "-acodec copy". This does not affect the quality and should not have a speed impact. I wonder what the issue is though, ffprobe (and ffmpeg -debug_ts) allow to check the input timestamps, maybe the file is a little strange. Sorry for the late answer! Carl Eugen _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
