Audio/Video sync problems

[DapsyD002]

I recently made some data cds of avi video files I'd downloaded to play on my lite-on DD-A100 dvd player. There was 2 different sets of video files I downloaded. The first set worked fine on my computer and on the player once I'd made them into data cds. The second set worked fine on my computer but when I burned them as data cds the audio was badly out of sync with the video, the video being a couple of seconds behind the audio. The video would sometimes seem to almost catch up with the audio by playing really fast but then it would begin to lag again soon after, doing this a few times on each file.

I used the same burner, same cds, etc. I kept everything the same except for the files I was burning obviously.

Any idea what could be causing this and any suggestions on how to fix it would be appreciated.

[Ai Haibara]

You might try running the videos through a utility like GSpot, to see if there's anything about them that your player may not like. It could be VBR audio, for example. Do the videos play without any problems from the same discs on your computer?

[DapsyD002]

Got it in one mate thanks. Used Gspot (nice name btw and the files that didn't play correctly had VBR whereas the ones that did play right had CBR. Is there a tool I can use to convert the VBR to CBR?

[DapsyD002]

Anyone?

I've been searching the site/google all day and had no luck. Even downloaded a few converters that looked like they might have the option to convert the VBR to CBR. Is it even possible?

[Baldrick]

Strip out the audio to uncompressed wav, www.videohelp.com/virtualdubaudio
Add the new wav in the avi using virtualdub, Audio->wav audio and select the wav audio. Select audio->compression and choose mp3. Select video->direct stream copy and last save as a new avi.

You could also use ffmpeg to do this in one step, it is a command line tool like ffmpeg input.avi output.avi some settings that I don't remember.

[Ai Haibara]

What Baldrick said.

Alternately, if you want to use VirtualDubMod, you can try the (slightly different) method mentioned in this post: https://forum.videohelp.com/viewtopic.php?p=1577383#1577383

Yes, there certainly is more than one way to do it. I even did a conversion this evening by demuxing the audio, converting the MP3 to CBR, then opening VirtualDubMod and swapping the existing audio stream for the CBR MP3. (Some people claim that method may cause sync loss as well. I don't know about that, but the resulting MP3 was a handful of seconds shorter than the original VBR stream. The video didn't seem to have any sync problems, though. Just to be safe, always check your entire video.)

[DapsyD002]

I tried all 3 methods and the one that worked for me was the one usinf virtualdubmod but thanks to both of you for your help. I now have another problem, virtualdubmod doesn't seem to like certain files, I get to the stage where I am saving the wav and I get the error message

"No audio decompressor could be found to decompress the source audio format"

The error only happens with certain types of files and not others (both are avi xvid) Any idea what I can do to correct this problem?

[Ai Haibara]

I tried all 3 methods and the one that worked for me was the one usinf virtualdubmod but thanks to both of you for your help. I now have another problem, virtualdubmod doesn't seem to like certain files, I get to the stage where I am saving the wav and I get the error message

"No audio decompressor could be found to decompress the source audio format"

VirtualDub and its variants requires Video for Windows (VfW) codecs, and not DirectShow filters. Use GSpot on the videos that give you that message, and note which audio codec was used for those videos. Chances are, it's probably AC3 audio.

The error only happens with XOR releases and not with LOL (am I allowed to talk about that here?). Any idea what I can do to correct this problem?

Yes, that's venturing a bit close to breaking the forum rules. Baldrick would be a better judge of that than I, though.

[DapsyD002]

So do I need to download and install some codecs or something to get it to work in virtualdubmod?

Sorry about the lack of knowledge, it's the first time I've done this.

[Abond]

AC3ACM