audio stream lost [possibly file size problem]

[Nematocyst]

I've been editing with VirtualDub and VirtualDubMod for years and
never seen this before. At first I thought it was an Avisynth issue, but it's VirtualDub.

Anyway, I captured a marathon last night of about 7 hours using the PicVideo codec and PCM audio creating a 91 GB file. That file plays fine, both audio and video in mediaplayer.

But after 49 minutes 37 seconds, the audio disappears in both vdub and vdubmod. The audio disappears in the same place if I open the AVI directly, or if I open an AviSynth script with that source. I have no idea what to do at this point. I'm not even positive filesize is the problem, but I can't think of anything else different other than this file being so large.

Are there any other tools I can use to split out sections from the source and try those in VirtualDub?

Any other suggestions? I couldn't find any reference to this sort of problem in the FAQ.

[Nematocyst]

I did a search and found some avi splitting utilities, but I didn't find any free ones. So I just used the evaluation on them to see if that fixed my problem. And one of them did just what I needed.

(boilsoft) AVI Splitter & MPEG Splitter 1.22 behaved just like Vdub-- the audio disappeared at the same spot. That's sorta wierd to have the exact same bug.

Fx Joiner and Trimmer didn't really split it, but rather attempted to re-encode using whatever codec you want. But it did work and so did the audio. Also, it added it's own logo because it was in the trial period.

I didn't try Media4PC's AVI Splitter since it clearly says it doesn't support files over 2 GB.

But Easy Video Splitter (ezsplitter) worked best for me and I stopped searching at that point. There is no logo, but the trial version lasts only 7 days. It took a while to do the jobs, and it limited chunks to 4 GB, but that's a snap to get reconnected with AviSynth, so it was no big issue.

Anyway, it's clear VirtualDub has some bug with very large files that makes the audio stream disappear. Using ezsplitter, I was able to extract the segments I wanted, and then work on them in VirtualDubMod with the audio working.

[Dmitry Vergheles]

Try to do it by SolveigMM AVI Trimmer.
http://www.solveigmm.com/?Products&p=AVITrimmer