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Sony Vegas Preview Lag

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Michael PeceSony Vegas Preview Lag
by on Mar 4, 2012 at 3:09:21 am

Using Sony Vegas Pro 11.

When previewing a clip in the preview window that has no effects, it runs at 30FPS+, but if that clip has effects, i.e. is crossfading with another clip, when the preview reaches that point it drops to below 1FPS until the effect is over.

I have tried ALL preview modes.

I'm on Windows 7. 4GB ram, 3.06 GHz intel core 2 duo processor.

What can fix this?

P.S. I know about the render preview thing.


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John BeanRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 4:29:51 am

More RAM, a QUAD Core CPU, and an OpenCL capable GPU video graphics card that has lots of RAM!

OR ...

Have faith that Vegas will do what you want it to do.

If you want re-assurance, then just rendered out a test of the desired region in your project. You don't need to render out all of your project. If you keep your selected region to a few seconds, the render shouldn't be too long.


As well, if your source media files uses a video codec that is very CPU intensive to decode, you should re-encode it to some more expedient video codec that Vegas can more easily work with if you want better quality real-time preview.

For example, AVCHD (H264) is a highly compressed codec that requires a lot of CPU work to decode. But if you re-encode to some intermediate codec that is less compressed, it will give Vegas more time to focus on transitions and effects instead of decoding.


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Michael PeceRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 4:50:31 am

The files are wmv format. Also, when it's playing that part of the clip, the RAM is only using about 1GB, so I don't think it's that. So it's the processor or graphics card?


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+1


John BeanRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 8:53:58 am

Upgrading your computer will improve things, but if you have a lot effects and transitions, it is still going to be very poor preview.

It is still just a PREVIEW window!

You can step through your timeline manually (using mouse and keyboard) to see how each frame looks in the PREVIEW window. But even still, with a lot effects and transitions, the PREVIEW is still just a PREVIEW and will still be quite different from what the actual rendered-as output will be.


So for very intense sections of your project, you will need to render it out if you want to see a more accurate view.


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Mike KujbidaRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 12:51:13 pm

[Michael Pece] "The files are wmv format."

A core 2 duo is not the fastest computer around and WMV is a mastering format, not an editing format which helps explain why it's so sluggish.
Out of curiosity, why WMV and not an easier format to edit?


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Michael PeceRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 4:28:06 pm

My clips are from Call of Duty, and they are captured in some weird format, and my HD PVR comes with a converter that converts them to wmv. What would be a better format?


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Michael PeceRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 4:51:20 pm

Oh wow, turns out it WAS caused by wmv! So much stress. THANKS MICROSOFT ¬_¬

Thanks for your help guys!

P.S. My converter has the option to convert to MP4, and that works fine =)


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Mike KujbidaRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 5:23:59 pm

Glad you got it sorted out :)


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Michael PeceRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 6:16:58 pm

Ugh, the quality is bad on the MP4 format :(


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Mike KujbidaRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 6:20:04 pm

What other options do you have as far as video formats are concerned?


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Michael PeceRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 6:22:46 pm

The converter can convert to .MOV format.

I am going to try and render a .wmv clip as .avi, then re-render that as a .wmv again to see if .avi has the problem too.


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Mike KujbidaRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 6:26:26 pm

What's the make and model of your HD PVR?


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Michael PeceRe: Sony Vegas Preview Lag
by on Mar 4, 2012 at 6:29:46 pm

Not sure but, I've sorted it:

HD PVR records footage in to .M2TS format
I convert it to .wmv or .mp4 = problems

BUT, I tried importing the raw un-converted .M2TS file in to Vegas, and it works PERFECTLY!

Even better because, I won't have to wait an hour for the conversion!


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Mike KujbidaRe: Sony Vegas Preview Lag
by on Mar 5, 2012 at 12:10:06 am

.m2ts was going to be my next suggestion but you already figured it out for yourself.
Happy editing !!


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