AVISynth+ deinterlacing out of sync?

[Greenieman]

I've been trying to figure out how to use AVISynth for a while now, but my main problem this whole time was that audio wasn't synced up. My workflow is capturing with AmarecTV with Lagarith Lossless Codec, deinterlacing with AVISynth, and capturing and rendering with VirtualDub64.

The script I'm using:

SetFilterMTMode("QTGMC", 2)
AVISource("nuttybuddy.avi")
ConvertToYV12()
AssumeTFF()
QTGMC(preset="Slower", Edithreads=7)
BilinearResize(720,540)
Prefetch(26)

The audio is in sync for a bit, but then goes out of sync later on. How can I fix this issue, or any others that may be in the script?

[Aya_Rei]

Is the audio in sync for the raw file?

Hm, maybe try to QTGMC code Hushpower gave in this thread

QTGMC(Preset="Fast", FPSDivisor=1, EdiThreads=2) #FPSDivisor default is 1 gives double framerate; 2 gives orig FR

[Greenieman]

Yes, in the interlaced version it is, also that didn't seem to change it. Also, I'm not sure if this is it, but the video is being rendered at ~58-60 fps, but the video says it's 59.365 fps? I thought it was supposed to be 59.94 fps.

[mts1]

Greenieman, how did you know the original file was properly synced?
Did you use VirtualDub to play it back?

[Greenieman]

The original interlaced video was synced and I checked by looking through the video and it always stayed in sync with the audio, the issue starts when I watch the AVISynth preview, and after, when I export using VirtualDub, it is out of sync the same way the AVISynth preview was.

[mts1]

Could you elaborate, what exactly does it mean "checked by looking through the video"?

[Greenieman]

The original interlaced video that I got from AmarecTV before trying to deinterlace it with AVISynth, has it's audio in sync the whole time, no matter where in the video, it is in sync. But the deinterlaced version of the footage from AVISynth starts in sync, but gradually becomes out of sync.

[mts1]

Quote:

Originally Posted by Greenieman

The original interlaced video that I got from AmarecTV before trying to deinterlace it with AVISynth, has it's audio in sync the whole time, no matter where in the video, it is in sync. But the deinterlaced version of the footage from AVISynth starts in sync, but gradually becomes out of sync.

Greenieman, how about you try script with just one line:

AVISource("nuttybuddy.avi")

If the result will be out of sync, then your original capture file is out of sync.

[vwestlife]

Use MediaInfo to make sure the original file is 29.97 or 59.94 fixed frame rate, not variable frame rate. If it is variable frame rate, then you probably dropped frames during the capture.

[Greenieman]

I apologise for the wait, I've been busy, but yeah it says nothing about variable framerate from Mediainfo for the original interlaced file. Also, are you THE vwestlife?

[lordsmurf]

Quote:

Originally Posted by mts1

Greenieman, how about you try script with just one line:

AVISource("nuttybuddy.avi")

If the result will be out of sync, then your original capture file is out of sync.

Yes, do this.

Quote:

Originally Posted by Greenieman

Also, are you THE vwestlife?

Yep.

[Greenieman]

I think it's still dropping frames, just in the interlaced version it's less noticable. I haven't tried capturing with VirtualDub yet so I might try that.