Followed "how-to" guide, but sound is still out of sync...

[tastypoison]

I followed the how-to guide for making a vcd by first splitting the sound into a wav file and then re-combining the audio and video - but the end product still gets out of sync after about 5 minutes. The original video does NOT lose sync while playing on my computer.

My source is a DivX 3.11 avi video (185 Meg). Nero 5.5.2.3 will automatically convert the format before burning - so that's what I did first - and the video works fine, but the sound gets out of sync on the VCD (not by much...but definately noticable).

Next I used TMPGEng 2.02.31.119 to convert the avi to MPEG1 prior to burning. The process completed fine, but when I play the mpg on my computer - the sync still gets messed up. Once I saw the sound out of sync, I didn't bother to burn it to disk.

Then, I followed the directions on this site for splitting out the audio using VirtualDub 1.3c, and recombining and converting - again, all the steps worked, and the final mpg would play on my computer...but again the sound gets out of sync.

I am brand new to this, and it is very frustrating...I can play the original avi side by side with the mpg - the avi is fine, but the mpg sound loses sync no mater what I try.

Any help would be appreciated...Thanks.

[Truman]

Sounds like a framerate conversion. What is the source framerate and what are you aiming for?

[Redhawk]

This has worked for me, so hope this helps. In the past I used VirtualDub with it's normal settings and that usually worked fine. I've found that when I have problems (exactly the same as you described) I can get around that by going into the "Audio" menu of VirtualDub and choosing "Full processing mode" instead of "direct stream copy". This seems to rip the audio from the divx file while removing any compression. The file is much larger than normal (say 220MB for about 20min) but it encodes perfectly into VCD using TMPG. My guess is that TMPG chokes on the audio compression of the original divx.

[tastypoison]

Well Truman, I followed the directions and used VirtualDub to check the avi properties first...

Frame Size, fps (us per frame): 448x336, 29.970 fps (33367us)
# of frames (time): 47250 (26:16)

After the wav was built, I loaded the VideoCD (NTSC).mcf configuration in TMPGEng (as per the "how-to" based on the 29.970 fps). The instructions went on to talk about spanning multiple CD's...but my file is small enough, so I skipped that part.

and Redhawk...the "how-to" instructions told me to select "full processing mode", so that is the procedure I already used...

Am I making a stoopid Noobie mistake?

[jan_hut]

Maybe a stupid answer. But do you actually select the wav file you extracted with virtual dub as the audio source in tmpgenc? By default tmpgenc will select your original avi as the audio source and that get's you sync problems. It's something you easy overlook

[tastypoison]

Yup...I even stored the wav file in a different directory, so I had to browse to the new directory first.

Do audio sync problems have anything to do with the length of a vid? I've been playing with multiple shorter vids, and havent seen any problems so far...

Or, could it have anything to do with joining of multiple vids together into 1 big file? This troublesome file was broken into some 300 tiny parts for download, which I then joined with Peck's avi joiner...

[kjmacke]

The only time I have had this problem is when I have a bad frame or frames. In v-dub I manually run the key frame button over and over thru the whole movie until I run into the bad frame or frames then I remove them.

[kjmacke]

The only time I have had this problem is when I have a bad frame or frames. In v-dub I manually run the key frame button over and over thru the whole movie until I run into the bad frame or frames then I remove them.

[kjmacke]

The only time I have had this problem is when I have a bad frame or frames. In v-dub I manually run the key frame button over and over thru the whole movie until I run into the bad frame or frames then I remove them.

[tastypoison]

Ok, I can try that...but how will I know if the keyframe is bad? Will virtualdub tell me, or is there something specific I need to look for in the frame?

Thanks...