Audio/Video sync problems

[hoops10]

I used CCE + Maestro to create a set of vobs. I used dvd2avi to demux the audio and then to frameserve to Avisynth to CCE. For some reason, I am getting sync problems and I've never had them before (the movie is Harry Potter). I noticed that when I loaded them (the .m2v and the .ac3 files) into Maestro, the video is 2:32:36.18 and audio is 2:37:17.11. That's a big difference but I don't know why it happened. I used dvd2avi to create a project file and demuxed the ac3 track. Then I used Avisynth to frameserve to CCE, used pulldown to bring it back to 29.97 fps, then loaded the .m2v and the .ac3 tracks into MAestro. Any help?

I also tried the AC3 Delay Corrector program from Doom9 but the audio is still out of sync. It is still ahead of the video. Please help. Thanks.

[kilroy]

did u take out FBI warnings or anything like that...if u didnt in the beginning of the movie i can see why your audio would be off.. i believe i had teh same problem with A Walk to Remember, WB movie :(. after getting all that nasty intro shit outta there it was fine :)...hope this helps

[jeff_jordan]

@kilroy:
I think this shouldn't be the problem. If so, the duration of the video file should be longer than the one of the audio file; but it's vice versa.

The v/a ratio is 0.97024921... which is a real weired ratio, it doesn't match to any of the known frameconversion or pulldown problems (or pal speedup or anything similar).

@hoops10:
What happens if you build a *.wav file from the *.ac3 (or use dvd2avi to generate the *.wav) ? Does it still keeps the same duration ?
Which is the exact number of frames from your genuine *.m2v file, and which is the one of the videostream produced by your avisynth->pulldown->CCE process ?

oops hoops10, another question:
Is your video file larger than 4 Gig ? I once noticed a similar problem with Maestro/DVDPerformer. It happened that a large video file (>4 Gig) just appeared as 14 second clip.
Don't know why (system here is win2k & ntfs (the DVDPerformer runs @ Win2k !)).

[gump_boy]

Like Kilroy said, you gotta remove all the unnecessary vob-ids before re-encoding.

[hoops10]

I have also tried muxing this with Senarist (the CCE+IFOEdit guide) and Senarist gave me an error about the bitrate being too high. I have talked with some very knowledgeable people who have told me that it's possible that CCE might have had peaks (min 0, max 9800, avg 3300), where the bitrate was real high and that might be causing the sync probs. I am re-encoding the video (min 0, max 8000, avg 3300) to see if that works. If it doesn't then, I am totally lost.

[dvdRENEGADE]

I did Harry Potter with just the movie and then later redid it keeping original menus etc. Anytime that I do just a movie, I move my VIDEO_TS folder to the root of my drive.
For example, c:\VIDEO_TS . I then run SmartRipper. It sees the c:\VIDEO_TS directory as being a DVD. I then only choose the main movie to rip and rip it to a directory by itself. Then, you can run DVD2AVI and create your project file without having to worry about sync problems. Then, just adjust your .ac3 for the amount of delay using AC3Corrector and you're all set. Good luck, dvdRENEGADE

[jeff_jordan]

@hoops10:
You've started with a minimum bitrate of "0", this might really cause problems.
I would recommend to start with at least 2 Mbit/s. If you'd set the max. bitrate to 6 Mbit/s (with an average of 3.3 Mbit/s), you'd receive a very good picture quality using 3 pass VBR. And you would avoid peaks in the change of bitrate.

[hoops10]

After re-encoding it with min 0, max 8000, and avg 3300, scenarist worked great. But there are still sync probs. I don't get it. The audio is like 6 or 7 secs ahead of the video. The ac3 delay was only -83 ms, which shouldn't matter any way becuase Scenarist would take care of that. I really dont get this, anyone please help.

[auenf]

using maestro, if you do the create sync audio, i think it stretches or shrinks the audio to the size of the video, try it and see.

Enf...

[klona]

Regarding audio sync trouble look other post i just did in Error Scene duration shall be more than 0.4 second .

Regarding video, just uncheck the "compliant DVD" in CCE options. It seems it forced the max to 9800.
Working OK probably if you encode audio in CCE but we don't...
This override the max setting you set in VBR settings.