User's Manual
Table Of Contents
- Introduction and Features
- Getting Started
- Presets
- Video Controls
- Fullscreen
- Transitions
- Production Clocks
- Categories
- Fade Bar
- Pause Inputs
- Overlays
- Right Click Menus
- Settings
- Inputs
- Input Settings
- Audio
- Recording
- Live Streaming
- External Output
- Keyboard, MIDI and Controller Shortcuts
- Activators - MIDI Lights and Faders
- vMix Control Surface
- Web Controller
- Instant Replay
- PTZ - Pan Tilt Zoom
- NDI - Network Device Interface
- SRT - Secure Reliable Transport
- Data Sources
- vMix Call
- GT Title Designer
- vMix Title Designer (Legacy)
- PlayList
- MultiCorder
- Tally Lights
- Interlaced Support
- Statistics
- Snapshot
- Padlock
- Scripting and Automation
- Developer Information
- Shortcut Function Reference
- Safe Areas
- Undo Button
- Waveform and Vectorscope Monitor
vMix User Guide
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Set the audio encoding bit rate in kbps. A minimum of 96 is supported for MP4 and a minimum of 64 is
supported for AAC.
128 provides good near CD quality audio for both MP3 and AAC.
Video
Source
Select either Output 1 or Output 2 as the source for the stream in vMix 4K and Pro.
In all other editions Output 1 will be used and this dropdown will not appear here.
To configure what is sent to Output 2, refer to the Settings - Outputs section.
Profile
Select the H264 encoding profile to use. Baseline is lower quality, but uses less CPU. Main is higher quality
at the expense of higher CPU usage.
Level
This is an advanced setting for users wishing to specify a particular encoding level to match the capabilities
of an end point decoder.
Preset
This is an advanced setting for users who wish to fine tune the FFMPEG encoder (x264)
veryfast is the recommended setting which provides the best balance of CPU usage and quality
Aspect Ratio / Crop
The stream can be cropped to a custom aspect ratio such as Square (1:1) and Vertical (9:16) to suite
specialised streaming workflows.
The video is cropped to fit this aspect ratio by cutting the sides off the image.
To easily see the viewable area of the image from within the vMix production use Safe Areas to enable the
Square or Vertical lines.
Keyframe Frequency
Select the number of seconds between each keyframe in the video stream. Higher numbers generally result
in better video quality. 2 seconds is recommended
by some streaming providers and is the default here.
Threads
Specify the number of threads to use when encoding video and audio with FFMPEG as the Application.
4 is the default and is recommended. For 4K streaming, extra threads may provide better performance.
Network Buffer
This is the maximum number of seconds vMix can keep buffered at any time and reflects the maximum
streaming latency
from vMix. (Note that streaming servers and players add their own buffers on to this time)
Increase the Network Buffer if the maximum network speed available is unreliable.
Strict CBR