Discussion:
[linux-uvc-devel] Still image while streaming compressed stream
Matthew Lai
2014-01-01 20:17:44 UTC
Permalink
Hello!

I am currently streaming 1280x720 H.264 streams from 3 webcams (Logitech
C920) at the same time using a custom application, and that's working
great - thanks!

Just wondering if it's possible to get low resolution (160x120 would be
great) uncompressed images once in a while without stopping the stream?
This is a low powered embedded system (Gumstix, ARM Cortex-A8 @ 600
MHz), so decoding the H.264 stream is not really an option.

Alternatively, is there another way to do auto exposure/gain across all
3 cameras? I need all of them to have the same exposure/gain/shutter
because the video streams need to be stitched together afterwards. I'm
currently planning to get low res images from all 3, and basically do my
own AE/G.

Many thanks!
Matthew
Adrian Pardini
2014-01-01 20:57:17 UTC
Permalink
Post by Matthew Lai
Hello!
I am currently streaming 1280x720 H.264 streams from 3 webcams (Logitech
C920) at the same time using a custom application, and that's working
great - thanks!
Just wondering if it's possible to get low resolution (160x120 would be
great) uncompressed images once in a while without stopping the stream?
MHz), so decoding the H.264 stream is not really an option.
Hi Matthew, the uvch264src element of GStreamer does that (provide
both an H264 full resolution and a small preview). Sources are
available from http://cgit.freedesktop.org/gstreamer/gst-plugins-bad/
.

Best regards.
Matthew Lai
2014-01-02 01:05:34 UTC
Permalink
Hi Adrian,

I'll have a look.

Thanks!
Matthew
Post by Adrian Pardini
Post by Matthew Lai
Hello!
I am currently streaming 1280x720 H.264 streams from 3 webcams (Logitech
C920) at the same time using a custom application, and that's working
great - thanks!
Just wondering if it's possible to get low resolution (160x120 would be
great) uncompressed images once in a while without stopping the stream?
MHz), so decoding the H.264 stream is not really an option.
Hi Matthew, the uvch264src element of GStreamer does that (provide
both an H264 full resolution and a small preview). Sources are
available from http://cgit.freedesktop.org/gstreamer/gst-plugins-bad/
.
Best regards.
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