Sorting out audio sync problems in a DivX...

[Cobra]

Hi

I have ripped one of my DVDs to convert it to a VCD, but for some reason I am getting terrible audio sync problems. The movie starts off fine but slowly slips out of sync until the audio is about a second ahead of the video. This is happening under two different DivX encoders.

Does anyone have any suggestions as to how I can fix the problem?

Thanks

CobraDMX

[banjazzer]

What stages do you go through to get from DVD to VCD?

[Cobra]

I go from DVD to DivX, which basically acts as a temporal smoother and makes for a very high quality encoding from TMPGEnc, which I create a PAL VCD from. D2V is brilliant for SCVD, but doesn't seem to work well at all for VCD.

I have discovered that it was the rip I made of the DVD causing problems, not the encoder. Which means I wasted about 60 hours of encoding using different settings etc. Why didn't I try a different DVD?!

Why do you ask what stages I use?

CobraDMX

[banjazzer]

Why do you ask what stages I use?

Because you asked for suggestions how to fix the problem you are getting! Without knowing the details of how you converted to VCD it was impossible to offer any advice.

[Cobra]

Oh, go on then, I'll let you in on my secret!

I'm a bit busy just now, but I'll put it all up in 20 minutes or so!

Thanks,

CobraDMX

[Donny661]

Is your source an film movie (23.976fps)? if it is you can read this guide to help you convert it to PAL. http://www.vcdhelp.com/forum/userguides/78178.php

[Cobra]

Hi (again)

Right, here's what I do. It's a roundabout route but it works well for me.

Firstly, I rip the DVD using SmartRipper. This seems to make the nicest and most reliable job of it.

Then, I use Vidomi to convert the .VOB files to a DivX. I use the DivX 5 Pro codec. The settings I use are:

- 0-10Mb bitrate, two-pass, first pass, min quant. = 2 max quant. = 4, bidirectional encoding, GMC, light psychovisual, light pre-process source, performance/quality set to slowest, YV12 colour space

- Process audio, one pass normalize, 192Kbps, 44100Hz

- Enhanced AVI features disabled

It is in this stage that the problem is happening. However, I have managed to create a flawless DivX from another DVD so I think it may have been the rip. It was suggested on the Vidomi forum that I try using an Adaptive IVTC, which helped a lot but the audio still slips out of sync by about 1/2 second by the end. It also makes the video lower quality too, but this may be because I'm applying an IVTC to a PAL disc.

I have tried just creating a DivX with no sound, and ripping the audio into a .WAV separately, but it didn't help. Exactly the same problem.

I wouldn't worry too much about it just now. I'm going to try a few more of my DVDs and see how it goes, to se if it is the rip. I think it might be because I used a different ripper before SmartRipper and it may have screwed something up.

Thanks in advance for any advice!

CobraDMX