Threaded Compression In VirtualDub

[Soopafresh]

It's news to me at least. I don't when this feature was added to Vdub, but you can find it under

Options---->Preferences

[guns1inger]

Goes back to at least 1.8.4 (the version I am currently running)

[Soopafresh]

Well, sometimes I'm the last to know

[guns1inger]

I only know it goes back that far because I saw your post and checked. It is not something that has been advertised well at all.

[DarrellS]

It was added in Build 29808 (version 1.8.1)

[jagabo]

In practice, about the only time you see a significant difference from that setting is when you are using an inefficient (not well multithreaded) encoder and a moderate amount of filtering.

[SatStorm]

If you use CPU intensive tasks, multithread helps. Example: Neatvideo filtering and x264 encoding.

[jagabo]

A multithreaded encoder will run multithreaded regardless of the threading setting in VirtualDub. What that setting does is run the filter chain in a thread separate from the encoder. That allows filtering to overlap with encoding. But if you have a well multithreaded encoder like x264 running another concurrent thread will not result in improved performance because the encoder is already using all the CPU it can get.

[SatStorm]

In my case I have a boost. Around 30%
my CPU is a C2D6600 and I use winxp

[jagabo]

I find Xvid can only use about 75 percent of a dual core CPU. That leaves 25 percent available for filtering. So using the Threading option in VirtualDub should increase the speed when using Xvid -- depending on how much filtering you're doing.

[SatStorm]

Filtering? neatvideo... (need to say more?)
And the boost I have remains with x264 encoding.

[PuzZLeR]

Alot depends on the actual codec in the VFW list - what it itself, independent of the umbrella app VirtualDub, supports with multi-threading plays a role.

Then again, haven't experimented much with it myself. I've been more fascinated with yet another, not very well advertised, VirtualDub "new feature" - smart rendering. Now you can actually cut/edit DivX/Xvid files the way you want them, frame-accurate cutting, without having to settle for cuts at key-frames only. Works great! But that's another thread probably...

[DarrellS]

Alot depends on the actual codec in the VFW list - what it itself, independent of the umbrella app VirtualDub, supports with multi-threading plays a role.

Then again, haven't experimented much with it myself. I've been more fascinated with yet another, not very well advertised, VirtualDub "new feature" - smart rendering. Now you can actually cut/edit DivX/Xvid files the way you want them, frame-accurate cutting, without having to settle for cuts at key-frames only. Works great! But that's another thread probably...

That was the first thing I learned with the newer versions of Virtualdub. What bums me out is that none of the newer capture cards will save to Divx AVI which I was doing with my old ATI AIW VE card. I do have a screen capture device that saves divx avi and there are plenty of divx/xvid files to download so not all is lost.

Another great funtion along with Smart Rendering is making transitions using certain filters in Blend mode and using the Curve Editor. Again, only having to recode small sections using Smart Rendering where with VirtualdubMod or old versions, you'd have to recode the whole clip.

[PuzZLeR]

Another great funtion along with Smart Rendering is making transitions using certain filters in Blend mode and using the Curve Editor. Again, only having to recode small sections using Smart Rendering where with VirtualdubMod or old versions, you'd have to recode the whole clip.

Yes indeed. I did notice this in the brand new "View" menu myself and played around with it. It's neat! (However, didn't want to sabotage this thread too much... then again... too late :P) I do consider myself an editor first-and-foremost in this hobby and, being a DivX fan for years, have been thrilled this year that VirtualDub is pretty much the dedicated DivX/Xvid editor we've been looking for in years.

It's nice to see a long-time app like VirtualDub not stay complacent even in its established state.

[RogerTango]

Thanks, I didnt know that was there either.. Ill have to check my ver!

I use VDub quite often.

Andrew