AW: Displaying camera not working

[Iñigo Huguet]

I don't have playbin2, but I do have playbin.

It doesn't work right now, I think it is because the driver doesn't 
report correctly its available framesizes (width X height). That's why I 
had to specify them with video/x-raw width=720,height=576

There is any way to specify the framesize with playbin? If not, I will 
try to fix the driver.


El 24/04/18 a las 12:45, Bernhard Graaf escribió:
> Have you try to use playbin2 instead?
> Something like 'gst-launch-1.0 playbin2 uri=v4l2:///dev/video1'.
> If its works, have a look into the log and see what playbin2 had done.
>
> Bernhard
>
> -----Ursprüngliche Nachricht-----
> Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org]
> Im Auftrag von Iñigo Huguet
> Gesendet: Dienstag, 24. April 2018 11:13
> An: Antonio Ospite; gstreamer-devel at lists.freedesktop.org
> Betreff: Re: Displaying camera not working
>
> Hi.
>
> I have gotten one frame as you told me
>
> gst-launch-1.0 v4l2src num-buffers=1 device=/dev/video1 !
> video/x-raw,format=NV12,width=720,height=576 ! filesink
> location=raw_frame.bin
>
> Then, in my computer, I converted it to png:
>
> gst-launch-1.0 -v filesrc location=raw_frame.bin ! videoparse width=720
> height=576 format=GST_VIDEO_FORMAT_NV12 ! videoconvert ! pngenc !
> filesink location=raw_frame.png
>
> I can see the .png image correctly, so it seems that the driver outputs
> NV12. What can I try now? Maybe I need any additional plugin? (I'm using
> a custom build using Buildroot so I don't have all plugins installed)
>
> El 23/04/18 a las 17:09, Antonio Ospite escribió:
>> On Mon, 23 Apr 2018 16:26:42 +0200
>> Iñigo Huguet <inigohuguet at fanamoel.com> wrote:
>>
>>> I have managed to solve a problem: it seems that the sprite was not well
>>> reported by the driver (it said it was 1080 instead of 720). Now I think
>>> it gives the correct values for a 720x576px NV12 frame: sprite 720, size
>>> 622080
>>>
>>> However, I still doesn't have a good output, and I don't know what to do
>>> to find what's wrong (I have no previous experience with video nor
>>> gstreamer).
>>>
>>> With this pipeline: gst-launch-1.0 v4l2src device=/dev/video1 !
>>> video/x-raw,format=NV12,width=720,
>>> height=576 ! videoconvert ! xvimagesink sync=false
>>>
>>> I only get an output with very colorful lines (almost horizontal lines).
>>>
>>> I attach the output of the driver and gstreamer with
>>> GST_DEBUG=*videosink*:6,*imagesink*:6,*v4l2*:6
>>>
>>> Any hint? Thanks!
>>>
>> If you cannot trust the driver to report the correct data format (I am
>> thinking to the pixelformat in particular), then GStreamer videoconvert
>> won't be able to use the caps in any meaningful way.
>>
>> You could analyze a raw frame to confirm that it's actually NV12.
>>
>> A sample pipeline which (hopefully) dumps one frame is:
>>
>>     gst-launch-1.0 v4l2src num-buffers=1 device=/dev/video1 ! filesink
> location=raw_frame.bin
>> Upload the raw data somewhere and maybe someone will take a look
>> if they have time.
>>
>> Ciao,
>>      Antonio
>>
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