From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from galahad.ideasonboard.com ([185.26.127.97]:34106 "EHLO galahad.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750860AbaIJNl0 (ORCPT ); Wed, 10 Sep 2014 09:41:26 -0400 From: Laurent Pinchart To: Isaac Nickaein Cc: linux-media@vger.kernel.org Subject: Re: Framerate is consistently divided by 2.5 Date: Wed, 10 Sep 2014 16:41:28 +0300 Message-ID: <1918377.tBK2dPDOH0@avalon> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-media-owner@vger.kernel.org List-ID: Hi Isaac, On Saturday 06 September 2014 12:35:25 Isaac Nickaein wrote: > Hi, > > After patching the kernel, the rate that images are captured from the > camera reduce by a factor of 2.5. How have you patched the kernel ? If you have both a working and non-working version you could use git-bisect to find the commit that causes this breakage. > Here are a list of frame rates I have tried followed by the resulted frame- > rate: > > 10 fps --> 4 fps > 15 fps --> 6 fps > 25 fps --> 10 fps > 30 fps --> 12 fps > > Note that all of the rates are consistently divided by 2.5. This seems > to be a clocking issue to me. Is there any multipliers in V4L2 (or > UVC?) code in framerate calculation which depends on the hardware and > be cause of this? -- Regards, Laurent Pinchart