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We will be using 3 tools: transcode, mplayer’s mencoder and ffmpeg — all commandline tools. Anybody who has been keeping track of this journal should by now be aware that if I can, I avoid GUI point-n-click apps like the plague. Lastly, this mini howto is by no means exhaustive.
Basics mencoder -ovc codec for video output -oac codec for audio output -o outfile.avi mencoder infile.avi -ovc lavc -oac lavc -o outfile.avi transcode -i input_filename.mpg -y codec for audio/video output -o output_filename.avi transcode -i infile.mpg -o outfile.avi -y divx ffmpeg ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg Video CD ffmpeg -i infile.avi -target ntsc-vcd outfile.mpg Flash Videos ffmpeg -i infile.mpg -ab 256 outfile.flv *note: Use the “-ab” switch to control the sound quality. 64 is okay for home vidoes. For music you want something higher like 256. XviD First, something about video bitrates. Crummy youtube-like video is around 80-150. VCD quality is around 400-500. DVD quality is approx 800. Default bitrate for mencoder is 687kbps. mencoder infile.avi -ovc xvid -oac mp3lame -xvidencopts bitrate=687 -o outfile.avi *notes: If you want the outfile to have an estimated size (like 700mb), set a negative bitrate and replace the bitrate value with the expected size of the outfile like: -bitrate=-700000 - will give you a ~700mb avi file. Two-pass encodings will give a nicer video but will take longer to convert: mencoder infile.wmv -ofps 23.976 -oac mp3lame -lameopts abr:br=92 -ovc xvid -xvidencopts pass=2:bitrate=150 -o audiofix-150bit-xvid.avi Audio quality can be set via the -lameopts switch if you’re using mp3lame (-oac mp3lame) for the audio format: mencoder infile.avi -ovc xvid -oac mp3lame -lameopts abr:br=256 -xvidencopts bitrate=800 -o outfile.avi Microsoft media files (*.wmv, *.asf, *.wmx) Just follow the howto for Xvid and replace the infile.avi with any M$.wmv file you have. There’s an issue regarding some players (Xine) not being able to play wmv->xvid files converted using mencoder. Just use the -ofps 23.976 switch for that. DivX transcode -i infile.mpg -o outfile.avi -y divx DVD ffmpeg -i infile.avi -target ntsc-dvd dvd.mpg |
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