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wwdv  
#21 Posted : Monday, February 6, 2017 1:55:15 PM(UTC)
wwdv

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DWAM wrote:
Quote:

Vmix encoder settings underlies FFMPEG on CPU, it does not show options for GPU encoding


Do you mean all video settings include profile are useless for GPU encoding?
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DWAM  
#22 Posted : Monday, February 6, 2017 2:55:32 PM(UTC)
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I'm not sure...
I've got no time to check right now but it's possible to see how vMix translates FFMPEG settings for NVENC simply by checking the commandline it produces when streaming or recording... You can find it in the logfiles...
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wwdv  
#23 Posted : Monday, February 6, 2017 5:01:03 PM(UTC)
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This is the stream command with CPU encoding:

"C:\Program Files\vMix\streaming\ffmpeg.exe" -report -rtbufsize 256M -f dshow -i "video=vMix Video:audio=vMix Audio"
-codec:v libx264 -s:v 768x576 -pix_fmt:v yuv420p -threads 4 -bufsize:v 700k -g:v 100 -preset:v faster -profile:v main -level:v 3.1
-b:v 700k -maxrate:v 770k -codec:a libfaac -b:a 128k -strict -2 -rtmp_flashver "FMLE/3.0 (compatible; vMix/17.0.0.112)" -f flv rtmp://...


This is the stream command with GPU encoding: (the preset command is different and the level command is missing)

"C:\Program Files\vMix\streaming\ffmpeg.exe" -report -rtbufsize 256M -f dshow -i "video=vMix Video:audio=vMix Audio"
-codec:v nvenc -s:v 768x576 -pix_fmt:v yuv420p -threads 4 -bufsize:v 700k -g:v 100 -preset:v llhq -profile:v main
-b:v 700k -maxrate:v 770k -codec:a libfaac -b:a 128k -strict -2 -rtmp_flashver "FMLE/3.0 (compatible; vMix/17.0.0.112)" -f flv rtmp://...
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DWAM  
#24 Posted : Monday, February 6, 2017 5:41:01 PM(UTC)
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Thanks! It confirms the level parameter is not used for hardware encoder.
Also NVENC has different presets (than x264) which cannot be chosen thru vMix but it uses by default the Low Latency HQ preset which is optimized for realtime.
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