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Why the poor 64bit performance compared to 32bit in Vegas 10?
Full res playback of SD on the timeline is fine in Vegas 10a 32bit (as it always has for me in previous Vegas versions). However, Vegas 10a 64bit can only manage 20fps with the same project. Anybody know why?
Also, a 1 minute mpeg2 test render had these results (default vbr settings):
10a 32bit: 0:58 sec
8c: 1:08 sec
8.1: 1:18 sec
10a 64bit: 1:36 secI skipped version 9 but something’s not right here. Other 64bit apps (AE, Sonar, Photoshop) do quite well on my system which has reasonably up-to-date hardware (Win7x64, AMD 8750×3, 8mb, Quadro FX570) and up-to-date drivers so I’m stumped as to the poor Vegas 64bit performance.
-pc
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2 Replies
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That’s weird. I noticed right away that Vegas 10 was faster at playback of at least AVCHD in 720p (I have some 1080p and 1080i projects on the way) than Vegas 9, and I’ve only bothered installing the 64-bit version so far.
One possibility … since you skipped Vegas 9, this is probably your first time using 64-bit Vegas, right. Any chance the CODEC for that video playback is different for 64-bit versus 32-bit? Since Vegas works from the native formats you’re using, it is at the mercy of some system level CODECs. Like other plug-ins, you need 64-bit versions of the video subsystem stuff, at least for optimal performance (not sure if it works at all, or just goes slower).
Your rendering performance in 64-bit stands to reason if your preview is slow. Usually, video decoding is not a significant overhead, but when it is, it obviously will add to the rendering time, since your input format must be decoded before any compositing or rendering can take place.
If this isn’t a common SD format, try transcoding it to something common, like DV, and see what Vegas 10a does with it.
-Dave
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Thanks for the response, Dave.
You were correct and the slowdown is with the 64bit version of the Lagarith codec. I think I’ll try the other lossless codecs to see if I can improve the decoding performance.
Cheers,
-Paul
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