Streaming

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Setting up a QuickTime stream

These are basic guidelines for setting up a stream. Tweak as necessary. Before proceeding, make sure you've downloaded and installed QuickTime Broadcaster and hooked up your camera to your computer via Firewire or USB.

1. Launch QuickTime Broadcaster

2. Video settings:

  • check "Enable Video Stream" if using video
  • Size: 320x240 or 240x180
  • Compressor: Sorenson Video 3 or H.264
  • Quality: High or Best
  • fps: 15
  • keyframe: every 150 frames
  • Limit Data Rate to: 150 kbits/sec

Image:Qtbroad_vid.jpg

3. Audio settings:

  • check "Enable Audio Stream" if using audio
  • un-check "Play-through speaker" (this is to prevent feedback. check it if you want to be sure you have an audio signal coming in.)
  • Compressor: MPEG-4 Audio
  • Rate: 44.100 kHz
  • Size: 16 bit
  • Use: Mono (or if the bandwidth is available - stereo)

Image:Qtbroad_aud.jpg

4. Network settings:

  • Transmission: Automatic Unicast
  • Host name: 128.238.56.13 (IDMI) or qt2.waag.org (the Waag)
  • File: (enter a name for your stream)
  • username: USERNAME
  • password: PASSWORD

Image:Qtbroad_netwk.jpg

Note: IDMI's QTS server is available to worthy causes. Contact Hans Christoph-Steiner at hsteiner at poly dot edu.

5. Preferences

  • Select "Preferences" from the QuickTime Broadcaster menu and set the path to which you want the stream recorded.
  • Check "Hint for Streaming Server"
  • (The Presets Directory is optional. See Live Broadcast via QTSS for more info on setting up Presets.

Image:Qtbroad_pref.jpg

6. Broadcast

  • Check the "Record to disk" box, if you'd like to record the stream (recommended).
  • then click "Broadcast" and you are streaming!  :-) The address will show up under "Location" under the Preview window area. It will have "rtsp" as a prefix, as in "rtsp://128.238.56.13/kcny.sdp".

Note: if you are using IDMI's server and people are having trouble playing your stream, try adding the port number to the end of the server, like so: "rtsp://128.238.56.13:80/kcny.sdp".
Image:Qtbroad_broad.jpg

Troubleshooting: if you stop broadcasting, wait at least 10 seconds before starting to broadcast again. If you don't, you may get an error. (It has something to do with the server needing a few seconds to reset the filename).

If you're interested in reducing latency (lag), start with this blog post on Quicktime latency by a QTSS expert. For more information on streaming in general, check the Wikipedia's Streaming media page.

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