[MPlayer-users] Problems coding to 3gp

[Carl Eugen Hoyos]

Sebastián Lacuesta <sebastianlacuesta <at> gmail.com> writes:

> mencoder AnInputFile.ext -o TheOutputFile.3gp -of lavf -oac lavc -ovc lavc
> -srate 8000 -vf scale=176:144 -ofps 12 -channels 1 -lavcopts
> vcodec=h263:acodec=libopencore_amrnb:abitrate=12200

Did you try FFmpeg?
ffmpeg -i AnInputFile.ext -acodec libopencore_amrnb -s 176x144 -ac 1 -ar 8000
-ab 12.2k TheOutputFile.3gp

To downmix, you need -af channels=1, not -channels 1 (see man mplayer).

Carl Eugen