Slow preview/playback

HeavyMetal wrote on 10/27/2018, 2:18 AM

My preview playback performance is very unimpressive. When playing back at Best (Full), its stuttery and basically unusable, even is the case in Preview (half) depending on what the footage is.

I am editing off a NAS that sees 400-500MB/s writing so that cant be the bottleneck. I have tried it on an internal SSD with the same results just as a test.
In Task Manager whilst playing back, GPU is at 10-15%% and CPU does not climb above 55%, and memory is at 30 or so GB out of 64 max.

I cant think of any way to narrow this down, anyone have any ideas? I can watch RED .r3d footage back on Full quality in REDCINE-X without any issue or buffering problems, but in Vegas it is unplayable at maybe 1-3 FPS on Best (Full). I have tried with GPU accel on, and off.

Intel® Core™ i7-5820K Processor @3.30ghz
Vegas 15 (Build 321)
MSI AMD Radeon HD 7970 3GB GDDR5 Overclocked Edition PCI Express 3.0 
Windows 10 64bit
64GB of RAM

Comments

NickHope wrote on 10/27/2018, 2:35 AM

Update to build 387 then go through this: https://www.vegascreativesoftware.info/us/forum/faq-how-can-i-make-my-video-preview-play-smoothly-in-vegas-pro--104624/

I can imagine RED .r3d footage is a challenge. I think there has been barely any feedback on this forum about performance of that format in Vegas.

HeavyMetal wrote on 10/27/2018, 2:16 PM

Guessing it is a Vegas inefficiency in that case. Bummer. I know how to make footage play black cleanly by downgrading previews and pre-rendering and everything else I have set up is in line with that page, however with my system playing back RED in full quality is not an issue unless in Vegas, which basically defeats the purpose of a built 4k editing machine. Upgrading my computer doesnt seem to make sense, as nothing hardware-wise is being taxed while playing back. It is strange that Vegas doesnt have better support for RED considering its popularity in professional applications.

I am not excited about upgrading to Vegas 16 without any way of knowing if it helps, which I assume it does not