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Video TIPS
Getting INFO
avprobe <file>
Convert to webm
ffmpeg -i input.video -threads 4 -b:v 1M -crf 10 output.webm
Repair index
mencoder -idx input.video -ovc copy -oac copy -o output.video
MKV
convert to mkv
mkvmerge -o output.mkv <inputfile>
convert to mkv and downgrade quality
avconv -i <inputfile> -map 0 -c:v libx264 -crf 20 -c:a copy <outfile>.mkv
concatenate all *.mp4 files to output.mkv
mkvmerge -o output.mkv $(echo *.mp4 | sed "s| | +|g")