ffmpeg -i Zx9r-170316.mkv -strict experimental -c:a aac Zx9r-170316.mp4

MKV to MP4
ffmpeg -i input.mkv -strict experimental -c:v copy -c:a aac -b:a 192k

Mach aus MP4 ein kleineres MKV
avconv -i ZX9R_Angasen_Maerz_2017.MP4 -c:v libx264 -profile:v baseline -crf 23 ZX9R_Angasen_Maerz_2017.MKV

avconv -i input.mp4 -c:v libx264 -s:v 640×480 -profile:v baseline -crf 23 -c:a libvo_aacenc output.mp4

avconv -i quickfox.mkv -c:v libx264 -crf 28 -c:a aac -b:a 256k -strict experimental quickfox.mp4

Quality of the video is set with the -crf flag and quality of the audio is set with the -b:a option. The -crf option accepts a value from 0 to 51 where 0 is lossless, 23 is default, and 51 is total rubbish. A value of 18-28 is considered “sane” with 18 being “visually lossless”. The -b:a option accepts a bitrate value. Bitrate is a bit outside the scope of this tutorial, but suffice it to say that 128k, 256k, and 320k are considered low, medium, and high quality respectively. See what I mean about conversion quality being confusing? That’s not even the worst of it.

avconv -i input.mp4 -c:v libvpx -qmax 42 -s:v vga -qmin 10 -b:v 1M -c:a libvorbis -q:a 4 -f webm output.webm

avconv -i video.mp4 -c:v libtheora -q:v 4 -c:a libvorbis -q:a 4 output.ogg
avconv -i video.mp4 -c:v libtheora -c:a libvorbis -q:v 6 -q:a 5 video.ogg

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