Turning the Beaglebone into a high definition IP camera

Few weeks ago I posted some notes about using the Logitech HD Pro Webcam C920 with Gstreamer. I have since ported the setup to the Beaglebone, effectively turning my Beaglebone into a streaming IP camera that can deliver constant bitrate H.264 video at full 1920x1080p30 resolution without breaking a sweat.

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Using the Logitech C920 webcam with Gstreamer

Logitech HD Webcam C920You may already know about my existing enthusiasm for Logitech webcams, which is due to the combination of relatively good image quality, high resolution and easy to use UVC interface. I was therefore very happy to learn about their newest camera, the HD Pro Webcam C920, which in addition to the standard HD webcam stuff we already know from the C910, also provides hardware encoded H.264 video stream! This is rather new and there isn’t much software that can take advantage of it; however, with a little tweaking and hacking we can get the H.264 stream into Gstreamer, where after we can do pretty much whatever we want.

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Rocket integration

Wednesday evening the Logitech Webcam Pro 9000 UVC camera and the Gumstix Overo Fire based video recorder have been integrated into the rocket. I will not have access to them before the launch day on Sunday. Shown below is the camera and video recorder integrated into the rocket.

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Webcam pixel formats and Gstreamer caps filters

Up until now I have been using the standard (link) YUV 4:2:2 pixel format with my Logitech Webcam Pro 9000. This format is good for most cases; however, the framerate is limited to 15/2 fps at 1280×720 resolution, while the other supported formats (MJPG, RGB3, BGR3, YU12, YV12) support this reolution with up to 30 fps! So it was time for me to figure it out.

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Simple DVB with Gstreamer and GNU Radio

I have had this idea of using my webcam for digital video transmission for quite some time now. Capturing and processing video from UVC webcams has been a routine for a long time and I have had great success with Logitech webcams (the 9000 series) that have great UVC support. I still had a problem though with finding a good way to interface the GNU Radio transmitter and receiver to the video processing pipeline implemented in Gstreamer.

An idea for a DVB setup using a webcam, a laptop with Gstreamer and GNU Radio and the USRP

In my experiment with receiving packet radio from the ISS I used a named pipe to create a real time interface between the GNU Radio receiver and the packet decoder multimon. I decided to try this trick for sending video in to and out of GNU Radio and it works! The following experiments were implemented and executed on the 27th and 28th of July with some minimal preparation on the 26th.

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