Minor audio issues [Archive]

Cyberia

24th August 2003, 23:32

I get this error trying to use AVISource to open an avi containing AC3 audio: "ACM failed to suggest a compatible PCM format". However, DirectShowSource opens it fine. Is this normal?

Could an option be added to DirectShowSource to NOT include the audio? (Like AVISource has?)

Could the documentation be updated for DirctShowSource? Specifically I would like to see the "Seek" parameter doc'd.

Wilbert

24th August 2003, 23:47

Could the documentation be updated for DirctShowSource? Specifically I would like to see the "Seek" parameter doc'd.
I think this is pretty much updated, at least on avisynth.org.

I get this error trying to use AVISource to open an avi containing AC3 audio: "ACM failed to suggest a compatible PCM format". However, DirectShowSource opens it fine. Is this normal?

Yes. There is no ACM AC3 codec. DirectShowSource uses directshow filters to load files.

Bidoche

25th August 2003, 02:24

Did you try using KillAudio() just after DirectShowSource ?

Cyberia

25th August 2003, 17:44

OK I see... The doc is updated on the website...

For consistency I would think you'd want DirectShowSource and AVISource to be as similar as possible. AVISource can discard the audio, so I figure DSS should also. I'm sure KillAudio() will work, but why have an audio parameter in AVISource either?

Bidoche

25th August 2003, 18:07

Probably because not handling audio is less work for Avisource, who directly read from the avi.
And that is not the case with DirectShow, if you can't tell him to ignore audio.

sh0dan

27th August 2003, 12:56

but why have an audio parameter in AVISource either?
Because AviSource will fail if it is unable to open the audio (if any is present) - whether you use killaudio or not.

DSS will just deliver the video without audio, if it cannot open it. If there is problems reading the audio, killaudio fixes that problem.

Cyberia

28th August 2003, 03:27

@Shodan: That was the explaination I was looking for. It all makes sense now. Thanks.

fccHandler

1st September 2003, 20:20

Originally posted by Wilbert
There is no ACM AC3 codec.
http://fcchandler.home.comcast.net/AC3ACM (beta)

Wilbert

2nd September 2003, 22:23

Thanks for the correction! I actually knew you were working on this. But when reading about it in the unofficial Virtualdub forum, I thought it still had some issues?

fccHandler

3rd September 2003, 00:41

I only know of the issue with CCE; the audio skips or decodes as gibberish. But CCE also has issues with the Fraunhofer MP3 codec, and I don't think it's something I can fix.

AFAIK version 0.4 is working fine with every other app I've tested, but I welcome any bug reports. (Not involving CCE, that is) :p