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From: Gregor Jasny <gjasny@googlemail.com>
To: Andreas Weber <andy.weber.aw@gmail.com>, linux-media@vger.kernel.org
Subject: Re: How to tell libv4l2 which src_fmt should be prefered?
Date: Sat, 18 Jan 2014 23:34:19 +0100	[thread overview]
Message-ID: <52DB016B.5040108@googlemail.com> (raw)
In-Reply-To: <52DA5ABA.7070003@gmail.com>

Hi,

On 18/01/14 11:43, Andreas Weber wrote:
> Is there a way to tell libv4l2 which native source format it should
> prefer to convert from? For example my uvcvideo webcam supports natively
> YUYV and MJPG (see output below)
> ...
>
> So it picks up YUYV as source format. I had a look at
> v4lconvert_try_format but can see no way how to do this.

If I understand the source correctly the table at [1] is the brain of 
the conversion. MJPEG has a rank of 7, YUYV has a rank of 5. So YUYV is 
chosen. The function that picks the conversion path is at [2].

Currently there is no way to influence the decision. Why do you want to 
do this?

Thanks,
Gregor

[1] 
http://git.linuxtv.org/v4l-utils.git/blob/HEAD:/lib/libv4lconvert/libv4lconvert.c#l75
[2] 
http://git.linuxtv.org/v4l-utils.git/blob/HEAD:/lib/libv4lconvert/libv4lconvert.c#l379


      reply	other threads:[~2014-01-18 22:34 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-18 10:43 How to tell libv4l2 which src_fmt should be prefered? Andreas Weber
2014-01-18 22:34 ` Gregor Jasny [this message]

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