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  1. When trying to convert a video in VirtualDubMod, I get the following error:

    VirtualDub Error
    No audio decompressor could be found to decompress the source audio format.

    Media Player Classic says the audio is WAVE_FORMAT_EXTENSIBLE. When I play the video, the sound is handled by ffdshow, so I'd say I do have the right decompressor?

    I want to turn the audio stream into MP3, or maybe a similarly-compressed format that can be played back by ffdshow. It would be nice if it were still multichannel, but that's not a must-have.
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  2. What codec does the audio use? Use MediaInfo or GSpot to find out. My guess is AC3. In which case you need AC3ACM.
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  3. GSpot says

    Codec: 0xfffe (Extensible wave format)
    Info: 48000Hz 4608 kb/s tot (6 chnls)
    Stat: Codec NOT Installed
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  4. Use FFmpeg - re-mux A/V (it change audio codec id).
    Code:
    FFmpeg -i name_file.avi -vcodec copy -acodec copy new_name_file.avi
    Or demux audio and use Audacity (when export, downmix to stereo).
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  5. FFmpeg did change the codec ID, but then VirtualDubMod created a file with no audio even though I had the stream set to Full Processing, Compression - Lame MP3.

    I had to demux it, which I was hoping to avoid, but oh well.

    Thank you.
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  6. Originally Posted by MrFriendly
    FFmpeg did change the codec ID, but then VirtualDubMod created a file with no audio even though I had the stream set to Full Processing, Compression - Lame MP3.
    ...
    With or without Conversion... (change channels to stereo)...?

    If want multichannel audio, use AC3 codec.
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