An automated Vegas 24p workflow..

[Ajit Bikram]

Anyway I think I should tell you guys that I am very new to this kind of videoprocessing. My knowledge of video processing was just regular cuts, color and gamma corrections (inherited from my still photography) and transitions.
And I learnt a lot in this few days from you guys and also through reading.
Thanks a lot!

[Ajit Bikram]

Originally Posted by Mike Dulay

Ajit,
When DGIndex runs it demuxes the audio track into an mpa (MPEG Audio file). The filename contains the delay value and that is what we (Steve's exe and my original PERL) read and recode into the Delayaudio() line of the avs script.

well thats precisely what I think is going on in my case too. I do have the mpa files created (when using steve's exe) and that also included one delayAudio term in the avs script files. (different values for different file).

So I thought when I open this avs scriptfile in VirtualDub/DubMod I should find the duration of video and audio are exactly the same. But that is not happening. Can you check that with one of your avs files?

[Steve Szudzik]

Ajit, I'm quite new to this as well. I've done some basic video modifications in the past with my old analog cam & pinnacle studio. I've only been in the "digital" world for a few months myself and boy o' boy was there a wealth of stuff to learn! Ok, I could still just stick with the basics and not worry about all of that stuff, but I'm a geek at heart and am trying to soak up as much as I can. Working on little projects like this helps because it forces me to start digging into these apps to see how they tick..

--Steve

[Ajit Bikram]

same here ;-)

But my problem are more as I stopped coding about 7 years ago since my job does not require coding anymore! But I do work with scripts in linux/unix sometime.
So I find I need to read a lot more when it comes to windows!

[Steve Szudzik]

I haven't done any C or C++ in a while so I'm pretty rust at that. We switched over to using C# at my job about 6 or 7 years ago and I just haven't had the need to use C++ since then. I can work my way through the VDub C code fairly well, so I at least know what's going on. Translating that all back into C#, that would take me a bit longer which is why I haven't done the compressor dialog yet!

Linux & Unix, yeah I'd be totally out of my element there! No opportunity to work with those at my job, they kind of dislike the philosophy from what I can tell ; )

--Steve

[Steve Szudzik]

BTW, my cable modem appears to be on the fritz, so if you have a problem downloading the application, try again later. Service tech is supposed to be out on Wed. I'll put it up at an alternate site tomorrow though...

Steve

[Mike Dulay]

Originally Posted by Ajit Bikram

well thats precisely what I think is going on in my case too. I do have the mpa files created (when using steve's exe) and that also included one delayAudio term in the avs script files. (different values for different file).

So I thought when I open this avs scriptfile in VirtualDub/DubMod I should find the duration of video and audio are exactly the same. But that is not happening. Can you check that with one of your avs files?

LOL, we're a bunch doctors trying to fix an engine. :-) My programming skills are rarely used as well.

I've checked my audio vs video and their lengths are not exactly the same. 47.23 seconds of m2t vs 46.26 seconds of demuxed mpa. Could it be a measurement error due to MPEG-Audio compression? I had clips that are several minutes long but the talkies were in synch for my ears. Somehow they've stayed in synch via audiodub(). It's probably smart enough to do the temporal adjustments when you change the framerate.

What if you try something like this:

DirectShowSource("capture01-0064.m2t", fps=29.97, convertfps=true) # or fps=23.976

There are some notes about problems with DirectShowSource and synch:
http://forum.digital-digest.com/showthread.php?p=530584
http://www.videohelp.com/forum/archi...e-t323397.html

[Ajit Bikram]

Hmm.. you are probably right mike. This little difference might be due to compression. And in my case also I am finding them to be completely in sync to my ear!
But I have only converted small clips. So cannot tell what would happen if you have a longer (say about 10 min) clips. I would presume if its due to compression the differences will go smaller and smaller with larger clips. If not then there is something to worry about.
I am wondering can we forcefully speed up audio a little bit to match the video. Is that possible?
I am afraid I cannot devote time in video learning before the weekend!

[Ajit Bikram]

Originally Posted by Steve Szudzik

Linux & Unix, yeah I'd be totally out of my element there! No opportunity to work with those at my job, they kind of dislike the philosophy from what I can tell ; )

--Steve

I understand that! Well I personally like the GNU philosophy and most of the software tools I use in my work only run in linux/unix! So could not have helped it even if I disliked! ;-)

[Steve Szudzik]

Ok, I've published a new version of the standalone application. Updated binary and instructions are at:

http://www.szudzik.net/vegas/scripts/HV20Pulldown.html

What changed:
Not too much. I made the compressor templates more customizable so that you can create a new one (or delete existing ones) and they will get saved to disk to be re-used later. This pretty much only affects the Script Editor window and the "compressor" drop down list on the main dialog.

--Steve

[Victor Horz]

Used NewTek's SpeedHQ codec with:

VirtualDub.video.SetCompression(0x32716873,0,10000,0);

yielded a very impressive clip. I'll need to do some more in-dept comparison in the future.

[Victor Woo]

Originally Posted by Steve Szudzik

I put together a Vegas script DLL that further automates the process so you really don't have to do a whole lot of anything to remove the pulldown. The script will ask for a working directory (should be a clean directory that you don't mind the script to delete or copy things to) and the paths to the DGIndex and VirtualDubMod applications as well as the AVI Synth template.

--Steve

I've downloaded all programs listed in "http://www.szudzik.net/vegas/scripts/HV20Pulldown.html" except the "Template.avs.". It was a bad link. So I can't start processing now without this template file.
Could you post this file in this forum so I can download it?

[Steve Szudzik]

Below is the template that I have been using.


v=MPEG2Source("__vid__")
a=MPASource("__aud__")
audiodub(v,a)
TFM(d2v="__vid__")
tdecimate()

--Steve

[Duane Steiner]

I downloaded all the files needed but I getting an error when VirturalDub launches: AVisysth open failure/Script error: syntax error. I have checked all the files to make sure they are where they should be. Any idea of what I am doing wrong? Thanks.

[Ajit Bikram]

Are you trying to use VirtualDub instead of VirtualDubMod? That does give a syntax error.