Chromakeying causing massive render slowdown!

VanLazarus wrote on 2/8/2011, 12:03 AM
Sigh... I'm trying to render a 480x270 24p MP4 video clip 13 minutes in length. I'm using Vegas 10.0c 64 bit on a Windows 7 64 bit system with 6gb of RAM.

The source material is two 1920x1080 24p MOV files with a noise filtered mono audio track.

I've applied one Chromakey VFX to each clip, and a Brightness/Contrast VFX to the track.

At first, Vegas renders the output file at a quick clip.... the estimated render time after 20 sec tops out at 8 minutes..... but steadily, the render rate contues to slow.... from about 20fps to about 2fps after 41 minutes!!!!

After 41 minutes, it was 40% done, and it said that it needed 57 minutes more to finish..... but as the rate is slowly getting worse and worse..... it think it will take many hours....

I aborted it.... and tried a few tests, but the same problem continued to happen... I now started it again and will leave it running through the night.

Is this a memory leak or some other such bug? Has anyone experienced this before?

Comments

VanLazarus wrote on 2/8/2011, 12:36 AM
Well.... found the problem.

In an effort to get BCC Motion Key motion tracking working, I was told to use the Dynamic RAM Preview... but it still was only tracking to a certain point, so I boosted the RAM Preview size to it's max of 5111mb.... still didn't work. But....

I guess Vegas doesn't handle limited RAM very well... and does a death spiral when rendering.

So, if you notice the behaviour I was having, reduce (or remove) your Dynamic RAM Cache.
Jean-Guy-Breton wrote on 2/12/2022, 1:34 PM

Tu fais ça comment ?

PROCESSEUR Intel® Core™ i5-4690 CPU @ 3.50GHz

GRAPHIQUES Intel® HD Graphics 4600

MÉMOIRE VIVE 12 GB

SYSTÈME D'EXPLOITATION Microsoft Windows 10 Famille (64 bits)

Version 21H2 (10.0.19044)

CARTES MÈRES HP Modèle 2B2C Version 1.01

BIOS Version A0.02 HP 550-149

Végas pro 19

 

Musicvid wrote on 2/12/2022, 2:23 PM

If you sequester 85% of your system RAM just to do the preview, how fast is everything else going to get done on less than 1 GB? Consider a hardware upgrade, then trial Vegas Pro 19.

RogerS wrote on 2/13/2022, 6:52 AM

Tu fais ça comment ?

@Jean-Guy-BretonDynamic ram preview is under preferences/video in Vegas. Reduce it back to 200MB (default) or 0MB if you are using the GPU to encode (render).