From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]:5162 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752194Ab0LXOfT (ORCPT ); Fri, 24 Dec 2010 09:35:19 -0500 Message-ID: <4D14B106.2000502@redhat.com> Date: Fri, 24 Dec 2010 15:41:10 +0100 From: Hans de Goede MIME-Version: 1.0 To: Hans Verkuil CC: Mauro Carvalho Chehab , Linux Media Mailing List Subject: Re: nasty bug at qv4l2 References: <4D11E170.6050500@redhat.com> <4D14ABEE.40206@redhat.com> <201012241520.01460.hverkuil@xs4all.nl> In-Reply-To: <201012241520.01460.hverkuil@xs4all.nl> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-ID: Sender: Mauro Carvalho Chehab Hi, On 12/24/2010 03:20 PM, Hans Verkuil wrote: > On Friday, December 24, 2010 15:19:26 Hans de Goede wrote: >> Hi, >> >> On 12/22/2010 12:30 PM, Mauro Carvalho Chehab wrote: >>> Hans V/Hans G, >>> >>> There's a nasty bug at qv4l2 or at libv4l: it is not properly updating >>> all info, if you change the video device. On my tests with uvcvideo (video0) >>> and a gspca camera (pac7302, video1), it was showing the supported formats >>> for the uvcvideo camera when I changed from video0 to video1. >>> >>> The net result is that the image were handled with the wrong decoder >>> (instead of using fourcc V4L2_PIX_FMT_PJPG, it were using BGR3), producing >>> a wrong decoding. >>> >>> Could you please take a look on it? >> >> I'm pretty sure this is not a libv4l issue (other apps which allows witching >> the source work fine), but rather a qv4l2 problem, esp. as it uses libv4lconvert >> directly rather then going through libv4l (iirc). > > And I'm pretty sure it isn't a qv4l2 issue :-) > > For the record: qv4l2 can open a device node either in 'raw' mode bypassing libv4l > and using v4lconvert to convert unsupported pixformats, or in 'wrapped' mode where > libv4l is used for all device node accesses. > Interesting, how does it switch between the modes? Mauro were you using wrapped mode or raw mode when you saw this ? Regards, hans