I frames

auggybendoggy wrote on 12/29/2007, 3:41 PM

Guys,
is this only available in mpg?
When I set to render to avi I don't see it.

I simply want markers to be set in vegas to create a scene selection menu in Arc. However I perfer not to mpg the file from vegas as there seems to be a motion smoothness change.

Aug

Comments

Chienworks wrote on 12/29/2007, 3:55 PM

I frames only exist when there is temporal compression, that is, when partial frames are used and supplemented with data from previous frames. MPEG and WMV use this type of compression. DV and uncompressed AVI do not. Every frame is complete on it's own so you won't find I frames in those formats. Or, looking at it another way, in DV and uncompressed every frame is an I frame.

baysidebas wrote on 12/29/2007, 4:16 PM

"I perfer not to mpg the file from vegas as there seems to be a motion smoothness change."

Can you elucidate on this? Conventional wisdom calls for rendering to mpeg in Vegas rather than DVDA.

auggybendoggy wrote on 12/29/2007, 6:06 PM

I realize it's a bit backwards to let DVD do the job but I find that if I render from vegas to AVI (always remaining uncompressed)
and then allow DVD to render it's much cleaner than if I allow Vegas to MPG and then DVD arc to burn.

Now perhaps it's my lack of knowledge because when I take a MPG into DVD Arc it seems to re-compress all the files used in the project. You know how before preparing the project it shows you which items will need to be recompressed or not. Mine always need to be re-compressed.

But still yet, The AVI vegas to DVD seems cleaner to me than MPG vegas to DVD.

Aug

Former user wrote on 12/29/2007, 6:23 PM

If it is recompressing, then it would make sense that it is not as clean as importing the AVI, and the only compressing it once.

You need to determine why it is always recompressing your video.

Dave T2

auggybendoggy wrote on 12/29/2007, 7:05 PM

Dave,
I'll try to figure it out. I'll post up what I find.

Aug

baysidebas wrote on 12/30/2007, 6:57 AM

Indeed, you want to avoid re-compressing at all costs. The question is why you are recompressing at all. I produce about 50 hour and a half disks a year and have, so far, never had DVDA recompress a Vegas mpeg. Is it possible that your files are too big at the default quality settings? I have found that the default creates an mpeg that just about fills a single layer DVD with 90 minutes worth of video, I would have expected two hours to fit.