No video during encoding process

[JohnnyStar]

Hi,

Whenever VirtualDubMod is called from AutoGK I never see any video in either the input or the output video screens.

I've made sure that the "Display Input / Output" menu items are checked under the "Dub in Progress" dropdown menu but still I never see any video, just grey windows.

I'm encoding using XVID and although the projects work it would be nice to be able to see at what point in the movie the encoding has got to.

I've de-re-installed XVID 1.0.3 and still no joy.

Anybody any ideas?

Cheers,

J

[jggimi]

Hello, and welcome to the forum.

You won't see any video displayed by VdubMod. AGK and GK encode in Fast Recompress mode.

[JohnnyStar]

Thank you for the quick response and the friendly welcome.

Seeing as there were options to see input and output video I thought I was doing something wrong.

Ah well.

Cheers,

JS

[manono]

You can see the input and output only when using Full Processing (not Fast Recompress), but for various reasons that I won't go into, Full Processing is obsolete. Guess you'll just have to wait until the end to see what you got. :)

[chilled]

not entering that mysterious (for me) reasons, Id like to know if fast recompress mode is chosen by Len0x on AGK for speed-up reasons or it is also a best way than full processing mode or any other one (Note that I dont know the differences between them and Im not asking for them -guess there must be a faq somewhere...)

[manono]

Hi-

Nothing mysterious. I just didn't feel like explaining it. But since you asked, Fast Recompress is up to perhaps 30% faster, and doesn't require a color conversion to RGB. Keeping it in YV12 all the way (for DVD to AVI) theoretically results in better quality. It's not just len0x and AutoGK that uses Fast Recompress, but so does GKnot and anyone with any sense that does his own encoding. Q7 of the YV12 FAQ (http://forum.doom9.org/showthread.php?s=&threadid=37276) says pretty much the same thing.

[chilled]

ok thanks then. I think VDM gets non advanced users in confusion since the menu says something like
"-only streaming
-fast recompress
-other
-full processing mode"
which made me think that "full" would be a slower-but-better mode, as it is generally in other programs...

[jggimi]

Full processing mode in Vdub and its variants is done in RGB colorspace only. It is useful when using Vdub filters. But it typically requires two color conversions and causes loss of color information. Since GK/AGK filter with AviSynth, there is no need for Vdub filtering, and the color can remain in YV12 throughout the process.

Its faster, and there's no loss of color information.

[chilled]

thanks again
...and I know a little about avisynth filters but nothing about vdm filters, so gk rules... again.