vMix Live Production Software Pro - Manual (Page 94)

vMix User Guide
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MP4
Bit Rate: 25 Mbps (HD) or 8 Mbps (SD)
Audio Bit Rate: 192 Kbps
Pros: Files can be played anywhere and can be easily uploaded to most web sites
Cons: Provides good video quality for file size, but may not be suitable for high quality post
production video editing.
Setup
Click the Cog Button next to Record from the Main Window to bring up the Recording Setup window.
These settings will need to be configured before starting a recording.
Some video formats do not support partial recordings in the event of a power outage or system failure.
Read about Fault Tolerant recordings here
vMix AVI
For more information on the vMix AVI recording format, see the vMix Video Codec section of this help file.
AVI