This is a really quick post about how to convert vbr (variable bit rate) mp4 video files (such as those that come out of phone cameras/iphones) to mpg format. In order to do this, I have used three different pieces of software - mplayer, ffmpeg and avidemux.

Opening a vbr mp4 file in avidemux appears to kick up the following error: "No audio decoder found for this file. Save (A+V) will generate bad AVI. Save audio will work". The first thing that I did was to extract the audio:

This will dump out a wav file called audiodump.wav.

Now, open avidemux, open the original mp4 file and click past the error - "No audio decoder found for this file. Save (A+V) will generate bad AVI. Save audio will work". Go to audio -> main track -> audio source -> external wav -> select the audiodump.wav. You may need to tweak the sync to get the audio to match the video. Save the new file as temp.mp4.

Now, convert the temp file to a mpg file.

Finally, some of the videos that I converted were sideways, mencoder can fix this little problem as seen on this site:
http://www.yolinux.com/TUTORIALS/LinuxTutorialVideo.html

As usual, if you break your files using these instructions you get to keep all of the pieces.

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