Optimal RTMP Encoder Settings

RTMP publishing requires a stream key. For instructions on how to find your stream key, see How do I find my stream key?

Base URL: rtmp://ingest.phenixrts.com:80/ingest/

Streamkey Structure: <streamkey><separator><Phenix RTMP Ingest Options>

where the separator can be either be a semicolon ; or a pipe |. See RTMP Ingest Options for additional details.

Typical Example: rtmp://ingest.phenixrts.com:80/ingest/KK7rLBnoTaReAlvaLidStreAmkeYQCE1wRl;capabilities=hd,multi-bitrate;tags=myStreamTag

Common Capabilities:

• Set desired highest quality layer with sd (standard definition), hd (high definition), or fhd (full high definition)
• Include the multi-bitrate capability to automatically transcode to multiple quality layers for ABR delivery
• Include streaming capability to create HLS and DASH formatted streams available if applicable

Related Documentation:

• RTMP Ingest Options
• Complete List of capabilities

In OBS, the recommended settings will look like the following:

If you choose not to specify any capabilities, the following default capabilities will be used: fhd,multi-bitrate,playout-buffer=PT0.23S,high-fidelity

If some capabilities are specified, but quality layer is not, then the sd quality layer will be used.

• Set bitrate output higher than the Phenix target bitrate for your desired quality level from the supported quality capabilities. Examples:

  • When sd capability is set in the stream key, Phenix targets 830kbps, so the RTMP encoder should be set to output 1,500kbps
  • When hd capability is set in the stream key, Phenix targets 1,600kbps, so the RTMP encoder should be set to output 2,500kbps.

• Frame rate  → set to 30

  • Certain video encoding/decoding pipelines will buffer a certain number of frames

• Keyframe interval → set to 1 second

• For x264 encoding, CPU Usage Preset → set to veryfast

• Profile → set to baseline

• Tune

  • OBS → set to zerolatency
  • Wirecast , set x264 command line options → -tune zerolatency

In OBS, these recommended settings will look like the following: