Jun 062007
 

Mplayer can play 3gp movies created on my Sony Ericsson phone, but does not play the audio. The audio can be extracted using ffmpeg.
ffmpeg -i input.3gp -acodec mp2 -ar 22050 -f wav output.mp2
Once the audio is extracted, it can be recombined with the video using mencoder.
mencoder -audiofile audio.mp2 -o output.mpg -oac copy -ovc lavc -lavcopts vcodec=msmpeg4v2 movie.3gp
The resulting mgp file can be easily played in mplayer.

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