Problem using LameMP3 with VirtualDubMod

[Mark53]

Hello,

I'm using VirtualDubMod 1.5.10 and I'm trying to recompress an AVI file. In the available streams window, I try to compress the audio stream with LameMP3 codec. I choose 48000Hz (320Kbps). Then, when I try to run the recompression, I get the following error message:
No audio decompressor could be found to decompress the source audio format

Why is that? Is that codec incompatible with VirtualDubMod?

Thanks in advance,
Mark

[jagabo]

The problem has nothing to do with encoding the audio. It's telling you it can't decode the source audio.

[Bernix]

Try this version, it should open everything Virtualdub Fork

Bernix

[pandy]

Install LAME ACM codec - this is common issue - missing ACM codec.
Btw you should avoid using VBR MP3 inside AVI container.
You can always encode audio track with ffmpeg (no video reencoding).

[Mark53]

@jagabo, I've decompressed the audio stream to a WAV file and that's this file I try to encode with the Lame MP3 filter. I guess VirtualDubMod should be able to read a WAV file...

@Bernix, thanks for the link, but that's a different version of VirtualDub, not VirtualDubMod. It seems the latter is more adapted to handle audio streams, am I wrong on that?

@pandy, it's precisely what I did, otherwise the Lame MP3 codec wouldn't appear in the list of audio codecs. I had ffmpeg codecs before, maybe I should reinstall it.

[Bernix]

Only thing I know it can open really every format I know. And audio too. So no problem for containers mkv mp4 etc. It open even H265 with HE2 AAC.

Bernix

[jagabo]

I've decompressed the audio stream to a WAV file

Are you sure it's decompressed? WAV can hold compressed audio just like AVI. If you simply remuxed a compressed stream into a WAV file it will still require an ACM decoder to decompress it. For example, if you open a video with compressed audio in VirtualDub and select File -> Save WAV, you will get compressed audio in the WAV file.

[pandy]

@pandy, it's precisely what I did, otherwise the Lame MP3 codec wouldn't appear in the list of audio codecs. I had ffmpeg codecs before, maybe I should reinstall it.

Microsoft offer some crippled ACM MP3 support but not for encoding - not sure also if all LAME ACM MP3 are capable to perform proper MP3 encode, perform "dry" test and try to encode PCM to MP3 using ACM codec.
http://www.rarewares.org/mp3-lame-dshow-acm.php