Recompression not needed

marcel-vossen wrote on 1/8/2015, 7:38 AM

Hi,

I'm rendering a pretty large project with of 6 hours of footage into WMV and I just needed to add a little intro to it at the front.

So i put the already rendered WMV file in the timeline again, added a 5 second intro and a layer on top with only a piece of text during the first 5 seconds.

What I notice is that it takes a long time to render it again, even though the output format is exactly the same as the footage format (for 99,9% of the video)
I remember that with past projects, in the render window a white notice would appear on a black background during rendering that said 'recompression not needed' , and that the rendering went very fast.

Does anyone know why this fast rendering does not happen in my current project? Is it because I have added another layer on top of the footage layer with an intro, even though this layer does not contain any information after the first 5 seconds?

Marcel

Comments

musicvid10 wrote on 1/8/2015, 8:30 AM

I've not heard that smart rendering is possible with wmv.

marcel-vossen wrote on 1/8/2015, 8:36 AM

Aha, so it depends on the format that you render in, if its possible to smart render?

musicvid10 wrote on 1/8/2015, 9:19 AM

Some avi and mpeg-2, that's about it.

riredale wrote on 1/8/2015, 11:39 AM

These for Vegas12, for example.

In the past I was stuck doing a big overnight render to a project if I found a misspelling or something. Now, it takes a matter of a few minutes to "re-render" a big project using the method of first rendering into mpg, then putting that file at the top, then cutting it open at the point where changes were needed. Wished I'd known about this years ago. My experience won't the same as yours--I'm working with V9 and HDV (mpeg2).

astar wrote on 1/8/2015, 8:05 PM

I think what you are looking for is WMV splitter/trimmer utility. MS used to include one in the WMV encoder 9 package, but there are other utilities out there too. Basically create your new inclusion at the exact same format as the original, then use the trimmer function on the original. Next use the join function to combine the new inclusion to the trimmed original. The problems I can see with this process, is the issue of matching the original WMV encoder settings. If they used a standard setting you should be able to pull this off. If not you may just need to re-encode the original with new changes. MS encoder 4 should be able to do this as well, as long as it recognizes the original file format settings, and allows that output setting.

Chienworks wrote on 1/9/2015, 9:41 AM

I've seen MS Encoder touted for just this use often.

What annoyed me the couple of times i tried it way back in the day was that it asked me to manually enter all the encode parameters, and if they didn't match the original file it would tell me i was wrong. If it knew the right values why didn't it just use them automatically?