Audio out of synchronization after IVTC

[Anonymous344]

I have been trying to make a non-anamorphic MKV back up of a R1 NTSC movie DVD. This was my workflow.

1. The DVD was ripped to my hard drive with DVD Fab.
2. I used pgcdemux to demux video and audio streams.
3. Womble's GOP fixer was used on the video file, just to fix the time codes, not to do any re-encoding or GOP trimming.
4. DGIndex reported that the file was 70.10% Film, which is the lowest I have seen for a commercial movie DVD. I used honor pulldown flags and made a d2v.
5. I used TIVTC as part of the following script:

Mpeg2Source("whatever.d2v")
TFM(d2v="whatever.d2v")
TDecimate()
Crop(8,46,-8,-50)
Spline36Resize(704,316)
AddBorders(0,2,0,2)# to keep Mod16

Finally, I encoded with xvid4psp.

The audio seems to be a few frames out of sync all the way through. There is no gradual drifting. The audio seems to lag behind the video by a few frames. MediaInfo does not report a delay when used on the audio tracks.

Can anyone help?

[poisondeathray]

when you demux with dgindex, what is the reported delay value? (should be written in audio file name)

Since it's a constant delay, you can fix it with DelayAudio() and enter the value

You can also manually figure out what the delay is by playing an avs script (that includes audio) in in a media player, and using +/- to figure out the ms delay and use that value for the muxing or encoding if you are re-encoding the audio

[Anonymous344]

when you demux with dgindex, what is the reported delay value? (should be written in audio file name)

I don't know how to demux in DGIndex. I have always used Pgcdemux to demux and then taken the video into DGIndex. Are you saying you can use DGIndex to pull out the whole video stream from the VOBs as you do with PGCDemux?

Thank you.

EDIT: It seems that if I add all the VTS files for the movie to DGIndex they join together and both video and audio can be demuxed. This will come in handy as it means I no longer need to use PGDemux as a separate step, or Womble for that matter. The audio delay reads as 0ms though.

[poisondeathray]

Is it still out of sync with dgindex demuxing?

If it is a constant delay, you can still fix by using the suggestions above

[Anonymous344]

Is it still out of sync with dgindex demuxing?

If it is a constant delay, you can still fix by using the suggestions above

Yes; it is still out of sync. This really does baffle me. I do not see why an IVTC would take the audio out of sync, but there you go.

It seems like a constant delay, so I shall give the other methods a try. The audio is not greatly out of snyc, and I doubt most people would notice, but I tend to notice even small synchronization errors and find them distracting.

Thanks again!

[manono]

I do not see why an IVTC would take the audio out of sync...

It doesn't. The length after an IVTC is exactly the same as the original length (except a possible frame or 2 left over at the end, which won't affect the synch of the video earlier).

Did you check the synch when you originally demuxed using PGCDemux (hit the 'Check A/V delay' button)? Is this a newer movie using newer copy protection you may have decrypted improperly? Even DVDFab HD Decrypter isn't perfect and it's sometimes necessary to run the result through FixVTS.

A constant delay is easy to fix. Find out the amount of the delay and get rid of it entirely using DelayCut or adjust for that delay when muxing.

[Anonymous344]

Did you check the synch when you originally demuxed using PGCDemux (hit the 'Check A/V delay' button)? Is this a newer movie using newer copy protection you may have decrypted improperly? Even DVDFab HD Decrypter isn't perfect and it's sometimes necessary to run the result through FixVTS.

Yes; I tried PGCDemux's Check A/V delay button. It gives 0ms for all tracks.

The DVD is actually quite an old one. I shall try FixVTS. Thanks!

[manono]

If it's old then I'm not sure FixVTS is going to get the audio back in synch for you, but it's worth a try. It may be easiest just to fix the synch yourself. I've also run across a few for which I couldn't figure out why they were out of synch. Rather than waste too much time on them I just fix the synch myself by playing the resulting VOB (or AVI or whatever) in MPC-HC, using the +/- keys to put it back in synch, and then using that figure in milliseconds to fix the synch.