[Sugar-devel] libflashplayer.so and WebCam issue

[Gustavo Duarte]

Hey James,

Thanks you very much for you detailed and clear explanation of what is
happening.

I checked your points:

1) The camera is siv121c

2) Doing the gst-launch tests, both cases works like you mention

3) Record Activity work fine.

4) Fedora version is F20

5) Kernel version is 3.5.7_xo4-20150205.0332.olpc.8a4cfb6


So if i understood well, my problem is, flashplugin is expected RBG
video but the driver is giving YUV video signal, is something like
that ?

Is there some fix or workaround for this ?

Thanks in advance

Gustavo.


On Tue, Jun 9, 2015 at 5:16 AM, James Cameron <quozl at laptop.org> wrote:
> On Mon, Jun 08, 2015 at 07:39:51PM -0300, Gustavo Duarte wrote:
>> Hi guys,
>>
>> I'm having troubles using the webcam of a XO 4.0 with sugar 0.104.0
>
> There is XO-4, but no XO-4.0.
>
>> The problem happens when i want use the webcam on sites like
>> http://webcamtoy.com/es or http://webcamoio.com/es, these kind of
>> sites use plugin video flash player for access to the XO resources,
>> webcam and mic.
>>
>> The image showed by the webcam is very ugly, as you can see on
>> https://plus.google.com/102144018413535329430/posts/8otWagVC4JZ.
>
> Your image shows classic high quantity of green pixels, which happens
> when a program expects RGB data but the camera supplies YUV data.
>
> It does not happen with the ov7670 camera.
>
> It does happen with the siv121c camera.
>
> You can check the camera in use by typing "lsmod" command, look for
> ov7670, siv120d, siv121c, or siv121d.  These kernel modules are for
> different cameras used by XO laptops.
>
>> I wonder if the problem is on the flash driver or how the sites are
>> using the plugins.
>
> Your problem is likely to be with either the Flash plugin, GStreamer,
> or the kernel.  It will have nothing to do with Sugar.
>
> You can isolate, or exclude, the Flash plugin and Sugar by using this
> test at Terminal:
>
>         $ gst-launch v4l2src ! video/x-raw-rgb ! xvimagesink
>
> When this test is run on an XO-4 with ov7670, no problem.
>
> When this test is run on an XO-4 with siv121c camera, lots of green
> pixels and corrupt image.
>
> By removing the format request the problem can be avoided:
>
>         $ gst-launch v4l2src ! xvimagesink
>
> The same sort of problem can also occur with broken cable or
> connector.  You can test the camera and cable using Open Firmware:
>
>         ok test /camera:yuv
>         ok test /camera
>
>> I have understand that OLPC ask to Marvell the development of flash
>> player, so there are something we can do to try this works ?
>>
>> Some configuration to change ?
>
> I don't know which camera you have, nor which version of Fedora, so I
> cannot recommend any plan.
>
> When I wrote the kernel driver for siv121c about a year ago, the RGB
> format feature did not work, and so it was left out.  The driver does
> not advertise RGB format.  The driver was tested with Sugar's Record
> activity and GStreamer.  You can find the details in ticket #12785.
>
> --
> James Cameron
> http://quozl.linux.org.au/