About: How Live Video Cloud handles metadata streams and what PIDs are being transcoded depends on the output type and whether stream mapping is configured or not.
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→ Learn how to configure stream mapping.
Passthrough and transcoded outputs
Passthrough outputs to not forward metadata streams when stream mapping is enabled.
Transcoded outputs process more audio streams when using stream mapping.
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Stream mapping disabled |
Stream mapping enabled |
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Passthrough |
Stream content is unchanged and distributed as ingested |
Metadata streams are dropped |
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Transcoding |
Only the first video and audio stream are being transcoded |
Up to 1 video and 8 audio streams are transcoded; metadata streams are dropped |
Protocol limitations
Protocols such as SRT or MPEG-TS via TCP are capable of carrying multiple video, audio, and metadata streams. Other protocols such as RTMP, HLS, and social destinations delivered via RTMP can only contain one audio and one video stream.
Relative "first"
Protocols like SRT or MPEG-TS via TCP are capable of carrying multiple video, audio, and metadata streams, while protocols like RTMP and HLS can only contain one audio and one video stream.
For protocols that can only contain one audio and video stream, the meaning of “first video” and “first audio” depends on whether an output level mapping has been set up or not.
If stream mapping is enabled and no override is configured, "first" as part of a destination or resource location refers to the outgoing elementary streams as defined in the stream mapping tab.
If stream mapping is enabled and an override is enabled, "first" as part of a destination or resource location refers to the incoming elementary streams since overrides ignore the stream mapping tab configuration. This is also true if stream mapping is disabled and only and override is used.
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Override disabled |
Override enabled |
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Stream mapping disabled |
– |
"first" refers to the PID structure of the ingested signal |
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Stream mapping enabled |
"first" refers to the outgoing PID configuration |
"first" refers to the PID structure of the ingested signal |