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Why is vMix easily maxing out our fast PC ?
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Kelvin  
#21 Posted : Saturday, July 25, 2020 12:41:53 PM(UTC)
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What Codec are you using under FFMPEG? The MP4 NVENC AAC codec uses the GPU. The others seem to use only the CPU. I didn't try all of them, but the one I tried did use the CPU and not the GPU.
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ProSonas  
#22 Posted : Saturday, July 25, 2020 5:04:24 PM(UTC)
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Originally Posted by: Kelvin Go to Quoted Post
What Codec are you using under FFMPEG? The MP4 NVENC AAC codec uses the GPU. The others seem to use only the CPU. I didn't try all of them, but the one I tried did use the CPU and not the GPU.


ProRes :)
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nottooloud  
#23 Posted : Tuesday, July 28, 2020 3:37:48 AM(UTC)
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Originally Posted by: ProSonas Go to Quoted Post
We've been setting up the recording part using FFMPEG and I tried MP4 instead.

When doing the exact same thing (4k 50fps project, recording in 4k 50fps) the FFMPEG completely maxes out the PC where as a similar recording in MP4 reaches 5-10% of CPU.


Try vMix AVI. Should be even less.
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sherifwassef  
#24 Posted : Saturday, January 30, 2021 9:20:31 AM(UTC)
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Simple Answer [Conclusion]
When you encode 4K video you must make sure that Hardware encoding is enabled and working. You should never encode 4k video on the CPU.
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gzifcak  
#25 Posted : Monday, February 8, 2021 4:23:37 AM(UTC)
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Pro Res uses CPU, try H264 if you want to use GPU instead
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Paul_WCP  
#26 Posted : Thursday, February 25, 2021 8:12:01 PM(UTC)
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Some good hints in this thread already. Here are my two cents.

Enable High Performance Input Mode in settings.
Make sure to not Encode more than 3 times with your GPU. (Usually thats enough. 1x Recording Cleanfeed 1x Record Dirty 1x Stream for example)

Your GPU has a turing chip that supports up to 3 encodes with its SoC NVENC.
https://developer.nvidia...e-gpu-support-matrix-new

NVENC only supports h264 and h265. Prores will use FFMPEG Encoding on your CPU.
https://developer.nvidia...m/nvidia-video-codec-sdk



Your system should easily handle your load.
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