2 usb cameras not working with opencv

The typical reason for 2+ USB cameras to not work together (still they might be working fine separately) is that USB bandwidth is insufficient for them both to run simultaneously. There is a bandwidth limit, which is rather low: The maximum throughput of an isochronous pipe (which is usually used for video) is 24MB/s.

More on this issue:

  • Implications of using many USB web cameras
  • How many USB cameras can be accessed by one PC
  • Not able to capture video using 2 webcamera simulteneously
  • Two webcams on one usb hub – bandwidth issues

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