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Big difference in FMLE cpu usage between vMix at 30 fps and at 60 fps
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Rehan  
#1 Posted : Thursday, July 10, 2014 4:30:00 PM(UTC)
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When I have vMix at NTSC 60i/30p and launch FMLE for streaming, the CPU usage stays around 10% for the duration of the broadcast (usually a couple hours).

When I have vMix at NTSC 60p, the CPU usage for FMLE starts off low but then rises to 50% or more within a minute and stays high. The only change is that vMix has been switched to NTSC 60p.

The PC has an i7-4770 processor and Nvidia GTX 660 video card. vMix Video Device output resolution is 854x480, which is the same as the FMLE streaming resolution.

What would be causing this big difference in CPU usage?
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richardgatarski  
#2 Posted : Thursday, July 10, 2014 5:22:39 PM(UTC)
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my guess is that going from 30p to 60p will indeed imply a significant increase in CPU usage. But perhaps not 40 percentage points.

Have you set the External frame rate (and resolution) to the same as vMix's general?
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Rehan  
#3 Posted : Friday, July 11, 2014 2:46:42 AM(UTC)
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richardgatarski wrote:
my guess is that going from 30p to 60p will indeed imply a significant increase in CPU usage. But perhaps not 40 percentage points.

Have you set the External frame rate (and resolution) to the same as vMix's general?

For external frame rate, I've tried both 30fps (to match FMLE) and 60fps (to match vMix system) and it didn't make much of a difference. In both cases, vMix still uses very little CPU -- typically around 5% or less. It's only FMLE's CPU usage that jumps up when I increase the frame rate in vMix.
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Maximus  
#4 Posted : Friday, July 11, 2014 8:12:44 PM(UTC)
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If you are inputting 60fps and outputting 30fps or any other frame rate, FMLE will have to do much more work and consume lots of CPU. If the input and output match, then FMLE consumes much less CPU. When I input 1080 and output 720, my CPU goes from around 35% to 90+%, If I input 720 and output 720, CPU stays around 30-35%.

That has been my observation.

Yours may vary
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