One episode really out of synic for some reason...

[tonemgub]

I've compiling an episodic DVD from AVI files. I have done this many times in the past using this method. The source AVI are usually NTSC, I convert to PAL by upping the framerate to 25 using AVIsynth and resizing and ripping the audio using virtualdub. I then correct the audio using Sony Soundforge's time stretch. I then use BeSweet to convert the WAV to AC3 then use Ulead DVD workshop to convert the edited AVI to MPEG2. I then compile it with DVD Maestro. I have made many DVDs successfully in the past with this method, however this one DVD, I'm making, I'm having trouble with the 3rd episode. For some reason the audio is really out of sync. Both the audio track and video are the exact same length and I used the same converting methods as the other episodes which are perfect. I even tried re-converting and re-encoding the problem episode to no avail. Help?

[Krispy Kritter]

sync issues are a pain and usually end up being very time consuming. There are guides on fixing out of sync issues...or try a search as this problem occurs all the time.

[tonemgub]

I've found a few guides, only problem is they're designed to fix the source video. In my case, the source video (the original AVI) is perfectly in sync. However it falls out of sync after I've converted and encoded it as described in my first post. Where am I going wrong?

[thegeeman]

There seems to be a lot going on and there is a great deal of opportunity for something to go wrong here. I think the issue may lie with the NTSC to PAL side-i'm no expert but this happened to me before and i tried to simplify things;

Perhaps consider converting video and audio together when encoding to PAL Mpeg2; Demux separate streams; now convert audio to AC3 (presumably you're doing 5.1) and then re-author back. This worked for me but you have to go with what you're more comfortable with.

[tonemgub]

Ah, that's a good idea, I'll try that. Yes, I'm encoding the audio with AC3, but I'm only using stereo sound.

[thegeeman]

Tonemgub

If only using stereo sound (2ch) then do not bother encoding and/or demuxing the audio and consider getting TDA for example with AC3 plug-in. This will then automatically output AC3 2ch. So just need to encode to Mpeg2 and then DVD author-that's it.

[lordsmurf]

Using source you did not create, and then re-encoding it, usually ends up in these kinds of unsavory problems. "AVI files", unless you captured them yourself and used a low compression or uncompressed codec, make for horrid DVD source.

[tonemgub]

lordsmurf: That's true, but if you get a good high resolution video that's been encoded well, the results do look quite nice.

Well, I've tried keeping the edited AVI together with it's audio track and converted both at the same time with Ulead. A strange popping sound has been introduced to the start of the track but perhaps this will force the audio ahead. I also notice that the audio track and video track of the encoded video are the same length. This shouldn't be, as the original video was sped up. But the audio does sound higher pitched, so it looks like Ulead has sped up the audio to match the video. I guess funny sounding audio is better then it being out of sync, I'll try creating a DVD out of these two files and see how it goes. And hope that I never come across another one of these videos again :P

*EDIT* Well, I've just tested the DVD I burnt, the episode is now in sync, if a tiny bit higher pitched and with that popping sound at the start. Hopefully this will be the only one (recall in my first post that all other episodes encoded with this methord turned out perfectly). Thanks for all your help guys! I'll post again if anouther problem shows up!