long mpeg-4 file on timeline slows things down?

essami wrote on 9/14/2007, 11:07 AM
Hi people!

I have a project that has one video track and 4 audio tracks. The videotrack is 1h 20min long mpeg-4 file on the timeline.

As long as I dont zoom in or out the video plays back without a moments hesitation on 25fps in the preview window. But as soon as I zoom in or out to edit it starts redrawing the frames of the video track. The size of the mp4 is 700MB. If I press play at any time after zooming it takes 5-20sec for the preview window to catch up to 25fps.

So my question is why is this?

Reason I'm asking is that normally I can have multiple 1-4GB avi files (ranging from 1 min to 30 minutes per clip) on multiple video tracks with 20 audio tracks and I can play back without any problem no matter if I zoom in or out even during playback. There's no lag whatsoever. With the avi files it just plays without any hesitation always at 25fps. I just tried having both the projects open and the other with the mpeg-4 file is just a pain to edit and the other with 20 times more tracks and 6GB more video plays without any lag in the redrawing of the frames. No matter if I choose draft or preview quality.

Is it because the file is so long and it has more frames to redraw on the timeline each time I zoom in or out? Can I do something to help the situtation? Even temporarily? What Im doing is just fitting temp music on a video track for an editor to place the music correctly later on.

Im using Vegas 7. PC with 3GB memory, WinXPhome SP2, Intel dual core 6400@2.13GHz.

Thanks in advance!!

Sami

Comments

xberk wrote on 9/14/2007, 11:18 AM
Just to be clear is this one continuous clip of 1h 20min in Mpeg-4 format?

One option is to render this to a standard AVI for editing if not other solution can be found. I use MP4 files without this problem but my projects are never over 30 min on the timeline total.


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essami wrote on 9/14/2007, 11:26 AM
Yes its one 700MB, 1h 20min long MPEG-4 file.

Im rendering it into an avi file now and lets see if that helps. I tried avoiding this since its a 50 minute render and Im on a tight schedule but if it helps it'll be worth it :) One hour less sleep never hurt anyone. Thanks for the advice!

Sami
TheHappyFriar wrote on 9/14/2007, 11:26 AM
it's because it's a mp4 file. if you render it out to an avi then it won't be a problem (ie use "render to new track").
essami wrote on 9/14/2007, 11:28 AM

ok, perfect, good to have confirmation. Just rendering! Thanks so much for the help!!!

Sami
essami wrote on 9/14/2007, 11:31 AM

Also on a barely related note a friend of mine showed me that if you disable preview in After Effects it will speed up the render time in After Effects noticably. Should one render with preview window closed in Vegas as well or does it have any difference?

40 minutes free time to surf the forum now :)

Sami
essami wrote on 9/14/2007, 12:23 PM

Just finished rendering to avi and runs smooth and perfect :)

Thanks for the help!

Sami