strange AAC in .mkv file

[andhaka]

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

[vokiel]

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.

[andhaka]

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

[The DJ]

/* 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.

[andhaka]

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.

[Sigmund]

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".

[The DJ]

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

[andhaka]

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