Difference between revisions of "C920 Webcam"

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[[File:Logitech C920.jpg|400px]]
 
[[File:Logitech C920.jpg|400px]]
  
The Logitech C920 Webcam can be used with the Portsdown transmitter for both video and sound.  Note that the Webcam is used in native "uvcvideo" mode, and its on-board H264 encoder is not used; this is because the output bitrate of the H264 encoder cannot be directly controlled to match DATV symbol rates and FECs.
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The Logitech C920 Webcam can be used with the Portsdown transmitter for both video and sound.  It can be used in 3 modes: as a normal webcam providing images for MPEG-2 transmission with sound (either SD or 720p), as anormal webcam with H264 SD pictures (but no sound) being encoded by the Raspberry Pi, or using its internal H264 encoder to transmit pictures at SD, 720p or 1080p with sound. For the H264 with sound modes, the bitrate is fixed and the Portsdown MUST be selected to 2MS, 7/8 FEC for this to work.
 
 
===Constraints===
 
 
 
The C920 Webcam is used in place of the analog video capture dongle, which '''MUST''' be disconnected prior to booting up with the C920 connected.
 
 
 
The correct source to select is "Comp Vid"
 
 
 
The image size transmitted in MPEG2 mode is 800x600 pixels; in H264 mode it is the standard 704x576 pixels.
 
 
 
The audio source must be selected to "EasyCap".  Auto does not always work.
 

Revision as of 17:51, 19 March 2018

Using the C920 Webcam With the Portsdown

Logitech C920.jpg

The Logitech C920 Webcam can be used with the Portsdown transmitter for both video and sound. It can be used in 3 modes: as a normal webcam providing images for MPEG-2 transmission with sound (either SD or 720p), as anormal webcam with H264 SD pictures (but no sound) being encoded by the Raspberry Pi, or using its internal H264 encoder to transmit pictures at SD, 720p or 1080p with sound. For the H264 with sound modes, the bitrate is fixed and the Portsdown MUST be selected to 2MS, 7/8 FEC for this to work.