HON’s Wiki # Open Broadcaster Software (OBS)

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• Info
• Plugins
  • OBS NDI Plugin

Info

• Color format:
  • NV12 means Y’UV/Y’CbCr 4:2:0 chroma subsampling (chroma resolution halved in both dimensions), which is what OBS always uses for streaming output (see issue #3517).
  • RGB provides the most detailed colors, but with overhead. It’s pointless to use for streaming.
  • GPU offloading might support only some formats (I think it supports NV12 but not e.g. RGB).
• Color space:
  • Use BT.709, it’s newer than BT.601.
• Color range:
  • “Full” is a little better, but mostly pointless for streaming. Use “partial”.
• Make sure to set the color format, color space and color range both in the OBS advanced settings and for sources, and try to keep them consistent.

Plugins

OBS NDI Plugin

• Setup (Windows):
  1. Download the obs-ndi-*-Windows.zip archive: Download
  2. Copy the files into the OBS installation directory (merge with existing directories).
  3. Start OBS.
  4. If you haven’t installed NDI or NDI Tools, a warning should appear with a download link. Install it and restart OBS.
  5. Make sure NDI sources are available from the “new source” list.
• Info:
  • It uses “raw” NDI, not NDI|HX (compressed), meaning a 1920x1080 60Hz stream could use up to 132Mb/s (throughput from an NDI whitepaper).
• Issues (the ones I’ve faced):
  • Growing latency over time (1s delay after ~30m): https://github.com/Palakis/obs-ndi/issues/667
    • Maybe low latency mode (async OBS output) fixes this? Might introduce stutter tho.

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