video playback - prerender

MarkusH wrote on 7/23/2001, 10:43 AM
Why is playback of a video thats just being loaded into the project (in vegas audio), so incredibly choppy, while when doing a pre-render of the video (with the very same settings as the previously loaded video was compiled), the project plays back smoothly after the re-compile? There is not a single filter/anything that affects the loaded video, its just the pure .avi file being played back, without any change of *anything*.
How do you force vegas to just *use* the loaded video *as is* if theres nothing being done with it?

thank you

-Markus

Comments

Ted_H wrote on 7/23/2001, 10:57 AM
When you pre-render, there is a temporary AVI file created in your Windows temp directory. Vegas is playing this rendered file, and it is no longer trying to play all of your effects and transitions on the fly, so playback is much smoother.

Ted
MarkusH wrote on 7/23/2001, 11:04 AM
well, the problem here is.. there is *ZERO* video effects in my project. still the original video plays back like ass.
I.e. there has to be a way to avoid this (vegas audio 2.0g, 2.0d didn't do this).

ideas?
MarkusH wrote on 7/23/2001, 1:07 PM
please? really need to get this working, any help is highly appreciated.

thanks a lot

-Markus
SonyEPM wrote on 7/23/2001, 1:36 PM
there were no changes in this area between 2.0d and 2.0g.

What is your source material? If it is DV, and you have a project using a DV project template, then you should get full framerate playback as long as all other parameters are set to their defaults (Ctrl+Shift on app startup resets all prefs).

If it is MPEG source material, you may need to pre-render it.

Post the source media and project settings here and we'll help you out.
MarkusH wrote on 7/23/2001, 1:53 PM
video rendered down to thumbnail from 640x352 (orig size) at 320x152 (new size, being used in vegas audio project). Codec used is divx beta4 at a data rate of 115kbit/s. fps is 29.97. The video track is imported and not touched from there, i.e. *really* nothing.
The project holds maybe 12 tracks with a few events and one stereo track with music. the thing is 44khz, 16bit all the way. No effects used yet.

Only way to get video playback smooth is to do a preview render, but that a) totally eludes me why since vegas can just play back the .avi from the HD *as is*, and b) because I'm losing video quality I need to see the smaller stuff going on in the video.

This wasn't necessary in 2.0d, since I've never had to do pre-renders to get the playback fluent. Is there a new option that might make this necessary? If so, where do I turn that off please?

thanks for the help

-Markus
SonyEPM wrote on 7/23/2001, 2:03 PM
As I said earlier, nothing changed in Vegas in that area, so it is likely some project setting changed if indeed the media and the codec are exactly the same as before.

Try using the "Match Media Settings" button (in project properties, top right) and choose one of the divx files to match the project to. Set Video preview quality to "Preview Quality" and display the video as 320x152. If that still doesn't get you full frame rate, pre-rendering (or re-rendering a proxy uncompressed avi at 350x152x29.97 to a new video track) may be the only option.
MarkusH wrote on 7/23/2001, 2:17 PM
match media settings did the trick... don't know which setting was different still, but it works like a charm now.

thanks for the help! its very much appreciated!

-Markus
MarkusH wrote on 7/23/2001, 3:05 PM
on another note... is there a way to hide the video track completely? updating the series of frames visible there seems to slow down zooming quite some, so I'd like to only have the preview window visible but not those many little frames in the video track. Any way to do this?

thanks

-Markus
SonyEPM wrote on 7/23/2001, 3:47 PM
you can minimize the video track, but you cannot hide it entirely.