From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com (ext-mx04.extmail.prod.ext.phx2.redhat.com [10.5.110.8]) by int-mx04.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id nACDvKOo015415 for ; Thu, 12 Nov 2009 08:57:20 -0500 Received: from mail-gx0-f216.google.com (mail-gx0-f216.google.com [209.85.217.216]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id nACDv26h024533 for ; Thu, 12 Nov 2009 08:57:18 -0500 Received: by mail-gx0-f216.google.com with SMTP id 8so1997021gxk.11 for ; Thu, 12 Nov 2009 05:57:18 -0800 (PST) Message-ID: <4AFC127F.4070300@gmail.com> Date: Thu, 12 Nov 2009 14:49:51 +0100 From: Ryan Raasch MIME-Version: 1.0 To: Shun-Yu Chang References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: V4L-Linux Subject: Re: Camera preview, thin lines in the frames List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: video4linux-list-bounces@redhat.com Errors-To: video4linux-list-bounces@redhat.com List-ID: 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. Regards, Ryan > 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@redhat.com?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list