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Hardware encoding / streaming quality adjustments/improvements
Rank: Member
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Joined: 4/22/2017(UTC)
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Location: Los Angeles, CA
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Apologies if this has already been addressed I've searched all over....
I am using Nvidia GTX 1060 6gb GPU.
I am encoding 1080p 60 to Facebook (special permission to encode at 12mb).
I am using hardware encoder instead of CPU...simple taking a single feed and encoding to Facebook at 12mb. When I encode with my CPU I get flashing orange/red on streaming etc so I am sticking to GPU.
My point is when using GPU to stream my render time never jumps above 3ms MAYBE 4ms which leads me to believe I have much more headroom to improve the quality even more! Is that render time info just for inputs and not outputs like streaming? How much headroom do I really have?
Anytime I pause my encode and change encoding settings (level, preset, threads, etc) nothing changes when using GPU. So is the Hardware encoder just a single setting? Anyway to change the quality settings on hardware encoding, or its kind of a "pass through" no settings kind of deal? When I encode using CPU changing these settings definitely affects things, but not really on GPU. I am using FFMPEG2 setting
I am trying to fix pixelation on things like smoke, fast moving frames, etc and GPU doesn't seem to have any extra quality settings.
Thanks All!
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Joined: 8/21/2015(UTC) Posts: 324   Location: Cornwall, Ontario, Canada Thanks: 18 times
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Facebook doesn't support anything above 720p at the moment. As quote Per Facebook Live Video Specifications Video Format Video maximum resolution: 720p (1280 x 720) at 30 frames per second, or 1 keyframe every 2 seconds Keyframe: at least once every two seconds throughout the stream Recommended max bit rate:4000 Kbps Titles: must be less than 255 characters Live API: H264 encoded video and AAC encoded audio only Video Length 240 minute maximum length, with the exception of continuous live 240 minute maximum length for preview streams (either through Live dialog or publisher tools); after 240 minutes, a new stream key must be generated Advanced Settings Pixel Aspect Ratio: Square Frame Types: Progressive Scan Audio Sample Rate: 44.1 KHz Audio Bitrate: 128 Kbps stereo Bitrate Encoding: CBR https://www.facebook.com/help/publisher/162540111070395tsulls wrote:Apologies if this has already been addressed I've searched all over....
I am using Nvidia GTX 1060 6gb GPU.
I am encoding 1080p 60 to Facebook (special permission to encode at 12mb).
I am using hardware encoder instead of CPU...simple taking a single feed and encoding to Facebook at 12mb. When I encode with my CPU I get flashing orange/red on streaming etc so I am sticking to GPU.
My point is when using GPU to stream my render time never jumps above 3ms MAYBE 4ms which leads me to believe I have much more headroom to improve the quality even more! Is that render time info just for inputs and not outputs like streaming? How much headroom do I really have?
Anytime I pause my encode and change encoding settings (level, preset, threads, etc) nothing changes when using GPU. So is the Hardware encoder just a single setting? Anyway to change the quality settings on hardware encoding, or its kind of a "pass through" no settings kind of deal? When I encode using CPU changing these settings definitely affects things, but not really on GPU. I am using FFMPEG2 setting
I am trying to fix pixelation on things like smoke, fast moving frames, etc and GPU doesn't seem to have any extra quality settings.
Thanks All!
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Rank: Member
Groups: Registered
Joined: 4/22/2017(UTC)
Posts: 12
Location: Los Angeles, CA
Thanks: 7 times
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Desmar I appreciate the reply but as stated in my original message I have special access from Facebook internally to encode 1080p 60 at 12mb. Regardless of platform - the vMix settings in streaming do not seem to affect anything when hardware encoding is checked off.
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Rank: Administration
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Joined: 1/13/2010(UTC) Posts: 5,214 Location: Gold Coast, Australia Was thanked: 4301 time(s) in 1523 post(s)
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Hi,
The only setting that impacts hardware encoding at this time is the Profile.
Selecting Main or High should improve quality a little from Baseline.
vMix uses the NVIDIA "Low Latency HQ" option internally, so this should be the highest possible quality
from the encoder for low latency purposes like streaming.
As for render time impact. NVIDIA cards have a separate dedicated hardware encoding logic separate from the rest of the GPU,
so it's not really an indicator that the encoder could be pushed further to improve quality.
(That is without doing an offline multi-pass encode which is not suitable for streaming).
Hope this helps.
Regards,
Martin
vMix
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 4 users thanked admin for this useful post.
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Rank: Advanced Member
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Joined: 4/16/2017(UTC)
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Location: jamaica
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I wish that the vMix team would look at implementing features to use ATI cards, as I find that their drivers are very stable, and work very well, even with vMix...All my systems, and systems that I have built for persons use ATI cards, as they are more popular here, and they work very well....I find also that their cards are very sturdy as well, especially the Sapphire brand cards.....
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