Re: nasty bug at qv4l2

[Hans de Goede <hdegoede@redhat.com>]

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