Difference between revisions of "Video conversion"

From Linuxintro
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| '''-oac''' (output audio codec) || '''lavc''' (libavcodec); '''libmp3lame'''; '''x264'''
 
| '''-oac''' (output audio codec) || '''lavc''' (libavcodec); '''libmp3lame'''; '''x264'''
 
|-
 
|-
 +
| '''-ovc''' (output video codec) || list with mencoder -ovc help
 
|}
 
|}
  

Revision as of 07:39, 2 November 2011

convert dv video to avi

dv videos come e.g. from a camcorder.

mencoder test.dv -o test.avi -vf yadif,harddup <html><acronym title="output audio codec comes from libavcodec">-oac lavc</acronym></html> <html><acronym title="output video codec comes from libavcodec">-ovc lavc</acronym></html>
key possible values
-vf yadif,harddup (deinterlace using yadiff, eliminate duplicate frames); pp=ci (cubic interpolation)
-oac (output audio codec) lavc (libavcodec); libmp3lame; x264
-ovc (output video codec) list with mencoder -ovc help

convert video to 3gp

3gp videos come e.g. from a mobile phone.

mencoder INPUTFILE -nosound -ovc lavc -lavcopts vcodec=mpeg4 -vop expand=176:144,scale=176:-2 -o movie.avi -ofps 12
mplayer -vo null -ao pcm -af resample=8000,volume=+4db:sc INPUTFILE
ffmpeg -i movie.avi -i audiodump.wav -b 48 -ac 1 -ab 12 -map 0.0 -map 1.0 OUTPUTFILE

convert 3gp-Video to DivX

mencoder -ovc divx4 vid.3gp -o vid.avi

convert video for Palm

mencoder source.mpg -ofps 15 -srate 24000 -oac mp3lame -lameopts cbr:br=32:vol=5:mode=3 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=96:vhq: \
keyint=300 -vop scale=480:320 -o target.avi

or

mencoder source.mpg -srate 24000 -oac mp3lame -lameopts cbr:br=32:vol5:mode=3\
-fps 30 -ofps 30 -ovc lavc -vop scale=320:240 -o target.avi

Convert a DVD to a file

mencoder dvd://1 -oac mp3lame -lameopts br=192 -ovc lavc -lavcopts vcodec=mpeg4:vhq -o output.avi

TroubleShooting

Sound is out of sync

If you convert a video and sound is out of sync after the conversion, you need to look at

  • the video player
  • the converter

For example I got when starting mplayer

Requested audio codec family [mpg123] (afm=mpg123) not available.
Enable it at compilation.


See also