Next we have to transcode the video part of the file into a DVD Compliant Format (PAL used in this example). If your file doesn’t have audio – you can skip this bit! mplayer -ao pcm:fast:file=audio.wav -vo null -vc null yourIMM4.aviĪs a result we get a new Audio file, named here as audio.wav The first stage is to extract the audio into an interim format and container that can be later transcoded to AC3 for the Video DVD. It is not possible to deal with the video with FFmpeg due to the IMM4 Codec so from now on, Mplayer and Mencoder will help us out. This could be suitable for further analysis or clarification within other software. The resulting file will be a direct copy of the original audio with no transcoding. ffmpeg -i yourIMM4.avi -vn -c:a copy youraudiostream.wav The MediaInfo results of an IMM4 based AVI file with an audio streamĪlthough for most of the work we have to utilize Mencoder, as detailed in the original post, it is possible to extract the audio stream quickly using FFmpeg.
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