Audio synch problem and NOTHING is working...

[angelleye]

I've been having horrible problems with audio synch in with my avi captures. I've been capturing 640x480 Huffy with my ATI AIW 9700.

When I use gordian knot to do DVD rips everything works great. and gordian knot uses virtual dub right? or vdub mod. either way I've tried both and I CANNOT get it to work.

Anytime I have a capture that I try and encode to divx with virtual dub or vdubmod I always get the audio synch problems. If I don't have any comercials to edit out then I can use Dr. Divx and they come out great. Again, though I can never get it to work with Virtual Dub.

I've read though many different guides and I follow them exact...which isn't too difficult...but it just doesn't work out.

I currently have a video file (already encoded to divx) and an audio file (wav) which I'm trying to mux in the audio. I've used Virtual Dub and set audio to full processing and tried to encode to mp3 and mux in that way. I end up with audio that sounds like it's been stretched and decibels dropped way low...and it's way out of synch.

I've also tried to encode to mp3 using cool edit pro and then mux in the already compressed audio using VDubMod and I get normal sounding audio but just slightly out of synch. probably half a second or right at a second.

I've also tried using AVI-Mux with similar results.

Any information on what I may be doing wrong to make this happen would be greatly appreciated. Again, I've followed guides at doom9, vcdhelp, and divx.com step by step. Please help!

Thanks!

[darth rosenberg]

Do you lose frames, i.e. do you get dropped frames while capturing?

[angelleye]

dropped frames....usually no. The most I EVER get is 1% dropped and it might say that if I open up my email or something while I'm recording but it never goes any higher than that.

For this particular capture I don't think I even got that.

[darth rosenberg]

1%, that would be about 100x more than what you need to lose sync if you capture longer movies to AVI with a bad driver...

The issue is: if you lose a frame, the audio will run ahead 40 ms. Each time. If you capture driver does not compensate for this, the sync is screwed up.

Since you used different muxing tools, and got the same result, it must be the source which is bad.

[angelleye]

the source files that I try and do this with are always fine. Even with the 1% frame drop that I see at times the original NEVER has audio synch problems. And again, anytime I use Dr. Divx to encode they come out great.

The problem comes when I want to edit out commercials. Dr. Divx doesn't have this feature so I'm forced to use Virtual Dub (or something.)

If my audio had run ahead wouldn't it have a different duration on it? They're both EXACTLY the same time of 44:28.