Problem opening Avisynth files with VirtualDubMod

[fee3fow]

hey i am having problem opening Avisynth files with VirtualDubMod .When i try opening the file i got this error "Avisynth open failure: ACM failed to suggest a compatible PCM format." Does anyone know what is the cause of this problem?

[AlanHK]

A problem with the sound. Maybe use GSpot on the file to see what codecs you need.

But if you just want to edit or look at the video, you can add the "audio=false" option (you can abbreviate it to just "false") in your AVISource command, which means it ignores sound. I often get crashes in VDub with MP3 sound, so I generally use this option.

AVISource("movie.avi", false)

[fee3fow]

hey Recently i have trying using FitCD to create an AviSynth file but when i try opening it in VirtualDubMod i got this error "Avisynth open failure: No compatible ACM codec to decode 0x0055 audio stream to PCM" anyone know of any codec i can download to solve this problem?

[Pinstripes23]

Download the ac-3 acm codec and extract to vdubmod directory. Right-click on ac3acm.inf file and install.

http://fcchandler.home.comcast.net/AC3ACM/

[fee3fow]

i tried this method but the same error still appeared does it have something to do with the VirtualDubMod config? I was able to open AviSynth files using VirtualDubMod before formatting my com just can't remember how i did it

[jagabo]

Another solution:

Export (demux) the AC3 audio from your source With VirtualDubMod. In AVISynth add the "false" argument after the filename to disable the audio:

AVISource("filename.avi", false)

After opening the AVS script in VirtualDubMod add the AC3 file to your stream list.

[FulciLives]

It has to do with the way the sound was recorded. This happens sometimes although why ... I have no idea.

1.) Kill the audio as suggested in a post earlier in this thread

OR

2.) Re-do the audio as a PCM WAV file.

To do the 2nd point I would load the AVI file into GOLDWAVE and save the audio as a PCM WAV file. If you intend to convert to DVD video make sure you have a 16-bit 48k 2 channel PCM WAV file. Otherwise you can use 44.1k but 48k is the better option.

Then open the AVI file with VirtualDubMod. Go to the STREAMS option and "X" out the current audio (the original audio). Then add the PCM WAV file.

You can now save the AVI using DIRECT STREAM MODE and you end up with a new copy of the original AVI with untouched video (no re-encoding) along with a standard PCM WAV audio file.

Now use this file for use with AviSynth. Also you no longer need the original AVI and can delete it.

By the way ... when using GOLDWAVE you might as well make sure to normalize the audio. Sometimes it is best to normalize at -0.3db but othertimes you can get away with 0.0db and the normalize function in GOLDWAVE is under EFFECT ... VOLUME ... MAXIMIZE VOLUME.

There is a thread on here where one of our long term members wrote a "batch script/program" that does this for you ... it will take an AVI file and make a new AVI with PCM WAV audio. This can help you to "automate" the process I just described.

Here is a link to that thread ---> CLICK HERE

I would NOT suggest doing this if the original audio is AC-3 or DTS but only when it is MP3 etc.

- John "FulciLives" Coleman