Broadcasting

Configuration and scripts for the live video broadcast rig.

Video Tour from September 2017:

Not sure if anyone else will find this stuff useful, it's here mostly as a backup / archive for my own use. The repository is organized by physical machine:

colorburst is the main broadcast and sound machine
- Local storage for recording only, shared with smb
- Quad Intel i7, NVidia, Windows 10
- Main Video
  - Black Magic Decklink 4x SDI card (Microscope, DSLR viewfinder, Cat camera, Oscilloscope)
  - Magewell USB 3.0 HDMI capture dongle (to 4x1 switcher for demos)
  - AVermedia USB analog video capture dongle (analog wireless rx)
  - Logitech C920 webcam (desk cam)
  - Runs obs-studio and airserver
  - Encodes 12000kbit h.264 in hardware, streams to spacer
- Tuco Flyer Video
  - Black Magic Mini Recorder PCI card, 1x SDI input
  - Additional copy of obs-studio
  - Computer vision running on an Nvidia GTX 1080
  - Encoding 1080p30 at 2500kBps in software with x264
- Local Audio
  - On-board sound playback (general shop utility, playing music)
  - Line-In is the broadcast audio, via OBS.
  - This could all be replaced by software, but I had problems with both VB-Cable and Virtual Audio Cable
- Multi-channel Audio
  - Ableton Live for mixing, filtering, and recording
  - ASIO drivers, small buffer size for low latency
  - Generates a rough audio mix in real-time for the stream and video recorders
  - Unprocessed multi-channel recordings for later edits
  - All connections to other computer inputs/outputs made via audio transformers, to avoid hearing ground loop currents caused by digital communications between the same computers.
  - Shotgun microphone: Rode NTG-1
  - Portable headset microphone: Shure WH20XLR
  - 4-channel headphone amp for distributing the rough mix to video recorders
  - 4-channel passive mixer for combining the various shop computers (except for fishbowl) into a single Aux input for recording
spacer is a Linux transcode server
- Dual Intel, NVidia, Ubuntu
- Nginx rtmp server relays video from colorburst to YouTube and Twitch
- Runs real-time transcode for Twitch
- Off-line transcodes for time lapses
- Also a good place to run the status display.
fishbowl is the demo machine
- It's a Mac Mini. No special software needed for broadcast there.
- 4x HDMI switch for sharing this input with other demo objects is fishplex.
- This HDMI input is split to a monitor, HD60 recorder on cylindroid, and a USB3.0 HDMI grabber on colorburst.
cylindroid used to be my main editing workstation, now it's mostly file management
- Mac Pro, local thunderbolt RAID
- Backups
- Direct recording for oscilloscope (BlackMagic+OBS) and fishplex (HD60).
brassica is the CAD and editing workstation
- Adobe Premiere and After Effects
- Rhino license is stuck on this box
- Nice GPU here
- Direct recording for the microscope (HD60+OBS).
Other Hardware
- LED panel lights: Fovitec dual temperature
- Light C stands (for mounting of various stuff)
- SLR mounted on a variable friction arm

scanlime / broadcasting

Broadcasting

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