TMPEGEnc causes audio delay

[Wolverine_Ecks]

I separated the audio and video because I know TMPEGEnc doesn't handle that well. Everything goes fine but then the audio goes out of sync within 5 minutes. Just to make sure it wasn't the video I burned the avi straight through nero using its encoder and everything worked fine. Anyone know the problem? Thanks

[Poppa_Meth]

change in frame rate perhaps? have you checked the framerate of your AVI in Virtual Dub? just load the file in it and click on file menu and the file information option to see your framerate. now if you are converting to say DVD which in the US requires 29.97 framerate and the AVI is a different framerate then your video will be adjusted which will change the length of the video, but if you extracted the audio seperately the audio will still be the same length as the video was at the original framerate, which will throw them out of sync. to get around this I just extract the audio to WAV format and process it with the video in TMPGEnc. I've never had a problem doing this. I just run Video from the AVI and the audio from the WAV source and output to individual streams. Going straight from WAV to LPCM on the audio has never effected it in my experience, but it does serve to adjust the audio speed to match the new video framerate.

[mats.hogberg]

If it starts off fine, but then suddenly goes out of sync, there's a 99.9% chance that the AVI contains bad/undecodable frames at that point. That you can play it without problems doesn't say anything about it being error free. Scan the AVI for bad frames using VirtualDub MP3 Freeze.
If it gradually gets out of sync, then a frame rate conversion is the probable cause, just like Poppa_Meth suggests.

/Mats

[Wolverine_Ecks]

Nah, I set it up through the wizard with the correct frame rate. I believe it's like 23.9 something. I checked it and it gradually goes out of sync not all of a sudden. Could someone explain with more detail with the correction of this, I'm not too familiar with all of TMPEGEnc functions. Thanks

[Poppa_Meth]

so you are encoding to FILM framerate, but is the original AVI teh same framerate? you still need to check in in VDub and see what the original framerate is.

another thing that could be a problem. you say you seperated the audio and video but you didn't say how. Its possible that the original audio with encoded in VBR instead of CBR which can throw it out of sync as well. to get around this you have to extract the audio to WAV format and re-encode. Once again open it in VDub to find out. as soon as you open it VDub will give you a warning message if the audio is VBR.

[Wolverine_Ecks]

I went under file --> file information and under video it said fps = 23.976, I extracted the audio through vdub mp3 freeze program. I did run it through the original vdub and it did say that it detected an improper VBR audio encoding. So is there a way to work around this or am I limited to Nero's encoder .. which worked fine oddly

[Poppa_Meth]

its easy to work around. extract it to WAV and re-encode it in whatever format you need for your final project, just make sure to use a CBR encoding method when doing so. I've extracted files like this sever times and use FFMpeg GUI to encode to AC3 and never had sync problems.

You can do this in V Dub despite the warning. just go to audio menu and choose full processing mode. set compression to uncompressed. set conversion to your target settings. if DVD use 48000 16 bit stereo. then go to file and save wave.

[Wolverine_Ecks]

I think whoever ripped it messed up royally because nothing seems to be working. I've had problems like this before and fixed them so it has to be the video.