The VideoLAN Forums

Hi everyone...

I have this .mkv file that gives me problems... the video is standard Xvid and VLC player has no problem displaying that... but as for the audio I get this error of codec not supported.

Trying to extract it with mkvextractor I get an error saying that particular codec is not supported. it says A_MS/ACM which I think is some kind of AAC.

Probably your answers will be something like "VLC does not support that, period", but nonetheless I'd like to know if someone might know a way to extract this strange file and process it in some form that VLC might be able to play.

Thanks in advance

Cheers

I'll ask the question before someone else does:

Which version of VLC are you using? 0.7.2, 0.8.0-test1, nightly build?

I did encounter some problems with matroska files myself, but this is ongoing developement.

I'm using 0.7.2 under Mac Os X 10.3.5

the problem it's this darn AAC file with the strange ID tag...

Cheers

/* This is the MS compatibility mode which stores a
* WAVEFORMATEX in the CodecPrivate. */

So this can be MP3 or AC3 for instance or even AAC.

Try the 0.8.0-test1 build, it might be supported now.
Please report back if that works for you.

Hi.. I tried the latest build like you said, but this particular codec is still not supported...

Still I'd ask again if anyone know of a way of demuxing it.. even on a Pc... since I really need to listen the audio to translate it... sadly it's for work...

Thanks anyway.

Try to look through the vlc log to see if you find the codec in use. should say something like "unable to find decoder module for fourcc xxxx".

A sample can be uploaded to ftp://streams.videolan.org/incoming

I resolved.. since it was a file from work I asked them to call the source and have them send it encoded in a more standard package.

We didn't find however what it was inside the audio... apparently it was an AAC file, the problem being the A_MS/ACM tag that cannot be read by anything... even under some PCs I've tried...

This was after all a problem reflecting the melting pot of options in encoding audio and video... people should stick to more "normal" codecs IMHO...

thanks for the help anyway...

Cheers