A/V sync problem with VDub and DotCrawlComb filter

[saggitarius]

I have been doing a whole lot of Video8 caps recently and am currently running into a A/V sync problem.

The process chain

Sony TR517 Hi8 camcorder (w TBC and DNR)
Sima Colour Corrector PRO series (older model with knob adjustments for tint,colour,sharpness,contrast,rgb)
Canon ZR700 (AV/DV passthrough)
20 band graphic equalizer for audio enhancement

I am using WinDV to do the caps as if I was capturing miniDV so I have an uncompressed AVI to work with, which is in accordance to what I have researched about video restoration.
I am using the type 1 AVS file in WinDV. I know that type 2 is the recommendation for doing caps with this program, and while this setting worked fine when I was capping with my Panasonic miniDV camera, my caps lacked any audio when doing same caps with the Canon.

Now, when I load my AVI file into VirtualDub and then filter using DotCrawlComb, my audio ends up getting ahead of the video a few minutes into it, by at least a 10-15 second margin. You can see the video has a jerkiness to it as well.

I am using the default settings with DotCrawlComb. I was intent on using this particular filter to remove the speckled noise from the background on my videos.

TIA

[vhelp]

Last: Mar 20, 2007 21:13p

Evening saggitarius,

Normally, whenever you use a Spacial/Temporal filter solution you run the risk
of audio becoming out of sync. This is because of the way the frames are
buffered during filter processing for this type of NR filter.

Otherwise.. Maybe try this. Next time you load your Type 1 into vdub, do an
extra step of turning off audio, under:

** menu\audio\[x] no_audio

Then, do your filtering, and frameserve to your MPEG encoder as usual.
(in a second function, you would extract the audio from the Type 1 avi)
In your encoder (ie, TMPGenc) you would point your audio source to the
extractd Type 1 avi file that you saved as a WAV file.

Now, if that does not work, then my only other solution for your situation is
to just encode the video source (ie, .m2v) and later, create a WAV -> AC3
and combine them during the DVD authoring process to VOB. Course, your
mileage may vary should you include any cuts/edits during the encoding.

-vhelp 4232

[Soopafresh]

You're saying the sync issue doesn't happen if you don't apply the filter? As vhelp mentioned, processing the audio and video separately is the way to go on this.

[saggitarius]

OK, thanks. I think I understand the frameserver part, but how do I go about extracting the audio part? Do I use MPEG Tools (from TMPGEnc) and demux the streams or do I just load the file and save it as ES (audio only) mp2 file?

Thanks for the tips

[Soopafresh]

1) VirtualDubMod



2) Save the audio as WAV



3) Once You've Saved the Audio as WAV, Turn off the Track

[saggitarius]

OK Thanks for the tips Soopafresh and vhelp

I don't have virtualdubmod, but i do have virtualdub, so I had to figure out where the settings you mentioned resided.


1) VirtualDub, select File then Save WAV



2) Name and Save file somewhere on your machine



3) Disable Audio

[Soopafresh]

Why not download VirtualDubMod ?

https://www.videohelp.com/tools?tool=VirtualdubMOD

[saggitarius]

What advantages does vdubmod have over the version I already have installed?