From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Isaac Nickaein <nickaein.i@gmail.com>
Cc: linux-media@vger.kernel.org
Subject: Re: Framerate is consistently divided by 2.5
Date: Wed, 10 Sep 2014 16:41:28 +0300 [thread overview]
Message-ID: <1918377.tBK2dPDOH0@avalon> (raw)
In-Reply-To: <CA+NJmkdrRWHvSwHQ248qHqaaGBu8N=4aY7XaPQ4WUeD3QrhjMA@mail.gmail.com>
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
next prev parent reply other threads:[~2014-09-10 13:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-06 8:05 Framerate is consistently divided by 2.5 Isaac Nickaein
2014-09-10 13:41 ` Laurent Pinchart [this message]
2014-09-13 21:27 ` Isaac Nickaein
2014-09-16 12:38 ` Laurent Pinchart
2014-09-20 13:14 ` Isaac Nickaein
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