Re: Camera preview, thin lines in the frames
|[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]|
Shun-Yu Chang wrote:
Hello, list: I am new to v4l2. I am working on integrating a usb camera device on the beagleboard(Omap3530 dev board). Now I met a camera preview issue that is there are thin lines coming out in the frames. I still have no idea how to describe this exactly. It's like the images shows here, http://0xlab.org/~jeremy/camera_preview.html
I have two guesses. One is the jpeg compression ,or is it jpeg? Try saving in raw RGB or Ycbcr format and viewing with imagemagick.
Does this happen in live preview? Maybe write data from camera directly to screen to see if happening there.
The second would be the FIFO (hadn't worked with omap before) levels of the data lines to the processor in the kernel.
Look at the system processor (top) usage to see how much cpu% is being used. USB has high overhead.
I modified capture.c sample to save the frames to picture files. So in my guess, the problem is not in userspace. And this is not happen on my laptop with the usb camera. Could anybody give me a clue ? Any one would be thankful.
-- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list
[Linux Media] [Older V4L] [Linux DVB] [Video Disk Recorder] [Linux Kernel] [Asterisk] [Photo] [DCCP] [Netdev] [Xorg] [Util Linux NG] [Xfree86] [Free Photo Albums] [Fedora Users] [Fedora Women] [ALSA Users] [ALSA Devel] [SSH] [DVB Maintainers] [Linux USB] [Yosemite Information]