[MPlayer-users] encoding at faster speed

[Nico Sabbi]

Il Monday 02 June 2008 08:48:57 Art ha scritto:
> I would like to encode a video lecture downloaded from the web to play
> at about 1.5 times the speed. The device I playback on has no way to
> change the speed of playback, as with mplayer -speed, which works
> perfectly for fast playback on my work desktop. Is there a way to do
> this with mencoder? Or other software? These lectures are painful to
> watch at regular speed.

mencoder -ofps N -af lavcresample=M ...
when N = fps*speed and M=original samplerate * speed
but be aware that basically very few  audio codecs accept
arbitrary sample rates (pcm being the only one I can think of)

> 
> Can someone also tell me how to increase the coding volume? I am new
> to this. The below is the encoding command I use:
> 
> mencoder -quiet -vf scale=320:240 $1 -o $2 -of avi -ofps 15 -ovc lavc
> -oac mp3lame -lavcopts
> vcodec=mpeg4:vbitrate=230:acodec=mp3:abitrate=64
> 
> Thanks,
> Art.

test -af volume=