Long Re-rendering Times

vanceen wrote on 5/8/2003, 7:09 AM
I'm finding that VF takes a very long time to produce a DV output of a project made from DV clips. Can anyone suggest why?

I'm importing DV video from my camcorder, editing, then outputting as DV using "Make Movie". Since most of the video is already DV format, why should VF render it again?

Is there some setting that will tell VF not to re-render video that is already compliant with the output format?

Thanks!

Comments

IanG wrote on 5/8/2003, 8:17 AM
VF will re-render a clip if it has a transition in or out. If you split your clips just before and after the transitions the overall render time should go down.

Ian G.
vanceen wrote on 5/8/2003, 8:35 AM
Ian G.,

Thanks for the reply.

I'm finding that rendering is taking a long time even without transitions.

For example, I put on the timeline a clip I had previously rendered. I split it after the first three minutes and deleted the second part, i.e. I had left a three minute clip of already-rendered video with no changes.

It took about 10 minutes to render that back to DV format!

I'm using a 2.26 GHz P4 processor and a fast Firewire hard drive, so I don't believe I'm hardware limited.
IanG wrote on 5/8/2003, 5:49 PM
That sounds wrong! I've just tried the same thing and got rendering times slightly less than the length of the clip. I can think of 2 possibilities - have you got something else on the timeline that's being included? You could zoom way out and see if there's anything there. Or try selecting a few seconds of the clip and rendering the selected region only. Possibility 2 - are you sure the input and output formats are the same? What output format are you using?

Ian G.
vanceen wrote on 5/9/2003, 4:47 AM
I found the problem.

I was outputting to the standard PAL DV template that encodes audio at 48 kHz.

I noticed that the files captured from my camcorder contained audio at 32 kHz.

I changed the output template to match the input files, and hey presto, encoding is now about half of real-time.

It seems as if clicking "match media format" in "project properties" should have taken care of that, but it didn't.

Thanks!
IanG wrote on 5/9/2003, 4:57 AM
Good news!

Ian G.