Video Transcoding Speed?

BillyBoy wrote on 4/3/2005, 1:45 PM
Maybe what follows are just a few dumb questions, but I'm curious. For a long time I've recommended if you need a AVI and MPEG version of the same project once one is finished, close down, start a new project with the finished file as the source for the second and then watch the render fly along.

I have always thought (someone correct me if I'm wrong) that transcoding is just converting from one file format to another. While I have gotten good speeds before, typically close to 1 to 1 ratio (roughly 3.0 Ghz CPU) when transcoding a AVI to MPEG, lately without me changing anything on my system, some but not all files process much faster then they ever did before. Like the one I just did. Typical AVI DV file with a length of 33 minutes just transcoded in a blazing 17 minutes 21 minutes. The frame counter is going so fast its almost a blur. Not that I'm complaining, just wondering what's going on? Frames in project = 59,437 so if my math is right that's 575.6 frames rendered per minute.

What gives? Others seeing similar speeds? Why do some transcoded files take longer? Like I said, maybe just dumb questions, but it seems odd to me that there should be such a variance since all were talking about is transcoding. All the real work was already done in the first render.

Anybody know?


Chienworks wrote on 4/3/2005, 5:30 PM
You may have used fewer transitions or whatever this time around. When i do straight DV->DV with no rendering i'll get about 5:1 speed on my 866MHz P3. I can copy an hour of DV to DV in about 10 to 15 minutes.
PeterXI wrote on 4/3/2005, 6:31 PM
Billy Boy,

I think it was you who recommended rendering my projects to a single AVI before printing to tape or rendering to MPEG1/2/WMV. I've been doing that for years now and the speed is amazing, especially with a dual processor 3.2(?). Also the AVIs are great for Main Concept standalone batch rendering overnight.

I thank you again, especially for the print to tape tip

BillyBoy wrote on 4/3/2005, 8:33 PM
Glad it saved you some time. I just stumbled on it by accident. I don't think its mentioned in the manual anywhere.