vMix Live Production Software Pro - Manual (Page 151)

vMix User Guide
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Quality
Select one of the built in compression profiles from the list or click the cog icon to customise the encoding
settings.
Video Codec
Select either H264 or HEVC as the video compression method.
Video Bandwidth / Audio Bandwidth
Specify the bandwidth in bits per second for Video and Audio. Example 2000000 = 2mbps and 128000 =
128kbps.
Audio bandwidth is total for all channels. For example for 8 channels, 384 = 48 kbps per channel.
Use Hardware Encoder
Use accelerated encoding where available on the graphics card. NVIDIA GeForce cards (and some low end
Quadro cards) are limited to 2 simultaneous encodes per system.
This includes the Streaming and Recording features in vMix, so care should be taken to ensure this tick box
is only enabled at two locations when using these types of cards.
(such as 1x Stream and 1x SRT)
Use Low Power Encoder
Some Intel Graphics drivers included support for "VDENC" which is a low power, high performance encoder
built in to some CPUs.
Tick this box to enable using this encoder where available.
Audio Channels
Specify the audio source for this output. A maximum of 8 channels of audio is supported by AAC.
Resolution
Optionally specify a resolution to downscale to. Only progressive formats are supported.
Alpha Channel
This setting must be set to None as alpha is not supported by the video codecs used by SRT.
Data Sources
Data Sources in vMix can be used to assign dynamic text and images to Titles from a variety of sources
including Google Sheets, Excel, CSV, XML and Text.