Hi Sean, This ratio also seems a bit suspicious to me...
Could you try FFV1 without 2pass? Did you do a framemd5 comparison to check if nothing was lost during transcoding? Nice greetings, Peter On 09/05/2019 02:01, sean darcy wrote: > I've got a bunch of old movies I'm reencoding and archiving. They're > mpeg2 in mkv. So I ran 2 pass vp9 and ffv1 : > > 6432740173 Apr 30 17:46 my-movie.mkv > 718020678 May 8 19:30 my-movie.nut > 1119231613 May 1 00:30 my-movie-vp9.mp4 > > I've never used ffv1 before. Is this expected ? Is it really this > effective as a lossless encoder ? > > Or have I done something stupid ? > > sean > > vp9 cmd : > #!/bin/bash > > Infile=my-movie > > Options='-r 24000/1001 -c:v libvpx-vp9 -b:v 0 -crf 29 -row-mt 1 > -threads 8 -tile-columns 6 -frame-parallel 1' > > ffmpeg -i "$Infile".mkv $Options -pass 1 -speed 4 \ > -g 9999 -aq-mode 0 -an -f webm /dev/null -y > > ffmpeg -i "$Infile".mkv $Options -pass 2 -speed 1 \ > -auto-alt-ref 1 -lag-in-frames 25 \ > -g 9999 -aq-mode 0 -c:a copy "$Infile"-vp9.mp4 > > > ffv1 cmd: > > Infile="$1" > ffmpeg -i $Infile.mkv -c:v ffv1 -level 3 -threads 8 -coder -2 -context > 1 \ > -pass 1 -passlogfile ffv1_passlog \ > -an -f nut /dev/null -y -loglevel info > > ffmpeg -i $Infile.mkv -c:v ffv1 -level 3 -threads 8 -coder -2 -context > 1 \ > -pass 2 -passlogfile ffv1_passlog \ > -map 0:1 -map 0:2 -c:a copy "$Infile".nut -loglevel info > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
