Auto switch to fallback stream

The Auto Switch function can be used to replace an audio source that is no longer available - for example, as a fallback for a simulcast.


Create a new additional source for this channel with the right incoming bitrate and select the fallback master server.


When creating listener mounts transcoding should be “forced”. Otherwise transcoding will be skipped if the source and listener mount have the same spec (e.g. same bitrate/format). The fallback mechanism is part of our transcodings so it needs to be enabled.


A special setting for the channel has to be created in “Advanced Settings”. This is the place for all settings that don’t have an UI and is written in JSON.


Description Structure of the JSON document

  • parameters silence, noise and threshold are freely configurable

  • configuration per channel

  • transcoding feature necessary

    "fallback": {
        "url": "",
        "max_silence": "10",
        "min_noise": "10",
        "threshold": "-30"

fallback is the Key for the settings

url is the StreamURL of the fallback stream. You can just copy the URL of the source here. However, we have a special service that redirects to the source if a channelkey (our unique ID for a channel) is given. It auto-selects fallback mounts. The syntax is<channelkey> Just use the channelkey of the current channel here. You can find it under “Setup”

max_silence is the number of seconds that the stream has to be silent before switching to fallback

min_noise is the number of seconds without silence before switching back

threshold is the audio level in dB that is considered silence