For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
After creating your live stream, save these values from the response. You will need them to configure vMix:
streamKey - Your unique stream key for RTMP streaming
srtSecret - Your passphrase for SRT streaming
streamId - Your stream ID for SRT streaming
playbackIds - IDs for viewing your stream
Note: Keep these credentials secure and don’t share them publicly.
Stream with RTMPS
RTMPS provides secure streaming over RTMP.
In vMix, click Settings > Stream > gear icon.
Select Custom RTMP.
Set Protocol to RTMPS.
Enter the FMS URL: rtmps://live.fastpix.io:443/live
Enter your FastPix stream key.
Configure encoder settings:
Resolution: Match your FastPix maxResolution (for example, 1080p)
Bitrate: 4000 Kbps or as needed
Encoder: NVENC (recommended) or FFmpeg
Click OK.
Click Stream to start streaming.
Stream with SRT
SRT provides low-latency streaming with error correction, ideal for unreliable networks.
Click Settings (gear icon, top-right).
Select Outputs / NDI / SRT from the left sidebar.
Click the gear icon next to Output 1.
Configure these settings:
Resolution: Choose your output quality (for example, “H264 2mbps AAC 128kbps”)
Audio Channels: Master
Alpha Channel: None
Check Enable SRT.
Set Type to Caller.
Enter the Hostname:live.fastpix.io
Enter the Port (for example, 778).
Set Latency to 200 milliseconds (increase if you experience network issues).
Enter your FastPix SRT secret in the Passphrase field.
Set Key Length to 32.
Enter your Stream ID from the FastPix API response.
Click OK on both dialog boxes.
Start or Stop SRT streaming
In the control bar of vMix, click External to start streaming (the button turns green whens streaming is active), and click it again to stop the stream.
View your stream
To view your stream, you can use the HLS playback URL or SRT playback URL. Refer to the HLS playback guide or the SRT playback guide for details.
When you stream with SRT on FastPix, you automatically get both SRT and HLS playback.
Troubleshoot common issues
No video input appears
Solution: Check that your camera or video source is connected and not being used by another app. Verify permissions in Windows Settings > Privacy > Camera.
Test your internet upload speed (need at least 2 Mbps)
Check that your firewall allows outbound connections on ports 35000–35500
Reduce your streaming bitrate
Click the gear icon next to the Stream button
Select a lower quality preset (for example, 720p instead of 1080p) or customize the bitrate to match your upload speed. See the vMix Streaming Quality guide
SRT stream won’t connect
Solutions:
Verify the hostname and port are correct
Check firewall settings on both your computer and network
Increase latency to 500–2000 milliseconds
Go to Settings > Outputs / NDI / SRT
Click the gear icon next to Output 1
Increase the Latency value, higher latency helps with difficult network conditions. See the vMix SRT configuration guide
Confirm your passphrase matches your FastPix SRT secret
Advanced features
Monitor performance
Enable statistics to check for dropped frames or high CPU/GPU usage:
Go to Settings > Options.
Enable Statistics.
Monitor the stats overlay while streaming or recording.
Use keyboard shortcuts
Assign keyboard shortcuts for quick actions:
Go to Settings > Shortcuts.
Assign keys to transitions, recording, or other functions.
