videotestsrc to generate rgb565 video stream failed

[Peter Xu]

hi, all,

I have found that videotestsrc plugin seems support rgb565 (by gst-inspect). So I tried to generate rgb565 stream with that and check it with ximagesink.

firstly, I tried this which worked:
$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1 ! ximagesink

however, this won't:
$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1,bpp=16 ! ximagesink
and the returned error is:
gstbasesrc.c(2755): gst_base_src_start (): /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
Check your filtered caps, if any

then, I think the bpp=16 is not confirm enough, so I tried this:
$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1,bpp=16,red_mask=31744,green_mask=992,blue_mask=31 ! ximagesink
also failed with the same error on the cap:
gstbasesrc.c(2755): gst_base_src_start (): /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
Check your filtered caps, if any

Can anyone tell me what's the matter? and how to generate rgb565 video stream with videotestsrc?

Peter

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[David Schleef-2]

On Fri, Jun 10, 2011 at 10:02:25PM +0800, Peter Xu wrote:

> hi, all,
>
> I have found that videotestsrc plugin seems support rgb565 (by
> gst-inspect). So I tried to generate rgb565 stream with that and
> check it with ximagesink.
>
> firstly, I tried this which worked:
> *$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1 ! ximagesink*
>
> however, this won't:
> *$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1,bpp=16 !
> ximagesink*
> and the returned error is:
> *gstbasesrc.c(2755): gst_base_src_start ():
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
> Check your filtered caps, if any*

Your ximagesink doesn't support 16-bit video.

  gst-launch-0.10 -v videotestsrc ! video/x-raw-rgb,bpp=16 ! fakesink



David

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[Peter Xu]

On 2011年06月11日 02:28, David Schleef wrote:

> On Fri, Jun 10, 2011 at 10:02:25PM +0800, Peter Xu wrote:
>> hi, all,
>>
>> I have found that videotestsrc plugin seems support rgb565 (by
>> gst-inspect). So I tried to generate rgb565 stream with that and
>> check it with ximagesink.
>>
>> firstly, I tried this which worked:
>> *$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1 ! ximagesink*
>>
>> however, this won't:
>> *$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1,bpp=16 !
>> ximagesink*
>> and the returned error is:
>> *gstbasesrc.c(2755): gst_base_src_start ():
>> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
>> Check your filtered caps, if any*
> Your ximagesink doesn't support 16-bit video.
>
>    gst-launch-0.10 -v videotestsrc ! video/x-raw-rgb,bpp=16 ! fakesink

Hi, david,

it's true that my ximagesink doesn't support bpp=16, and this worked for me:
gst-launch videotestsrc !
video/x-raw-rgb,bpp=16,red_mask=63488,green_mask=2016,blue_mask=31,depth=16
! ffmpegcolorspace ! video/x-raw-rgb,bpp=32 ! ximagesink

I have gst-inspect ximagesink, and got this cap:
...
Pad Templates:
SINK template: 'sink'
Availability: Always
Capabilities:
video/x-raw-rgb
framerate: [ 0/1, 2147483647/1 ]
width: [ 1, 2147483647 ]
height: [ 1, 2147483647 ]
...
I think the bpp requirement should be mentioned here, however, there
seems not.

Thanks.

Peter

>
>
> David
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>

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[Stefan Sauer]

On 06/11/2011 01:38 PM, Peter Xu wrote:

> On 2011年06月11日 02:28, David Schleef wrote:
>> On Fri, Jun 10, 2011 at 10:02:25PM +0800, Peter Xu wrote:
>>> hi, all,
>>>
>>> I have found that videotestsrc plugin seems support rgb565 (by
>>> gst-inspect). So I tried to generate rgb565 stream with that and
>>> check it with ximagesink.
>>>
>>> firstly, I tried this which worked:
>>> *$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1 !
>>> ximagesink*
>>>
>>> however, this won't:
>>> *$ gst-launch videotestsrc ! video/x-raw-rgb,framerate=5/1,bpp=16 !
>>> ximagesink*
>>> and the returned error is:
>>> *gstbasesrc.c(2755): gst_base_src_start ():
>>> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
>>> Check your filtered caps, if any*
>> Your ximagesink doesn't support 16-bit video.
>>
>>    gst-launch-0.10 -v videotestsrc ! video/x-raw-rgb,bpp=16 ! fakesink
> Hi, david,
>
> it's true that my ximagesink doesn't support bpp=16, and this worked
> for me:
> gst-launch videotestsrc !
> video/x-raw-rgb,bpp=16,red_mask=63488,green_mask=2016,blue_mask=31,depth=16
> ! ffmpegcolorspace ! video/x-raw-rgb,bpp=32 ! ximagesink
>
> I have gst-inspect ximagesink, and got this cap:
> ...
> Pad Templates:
> SINK template: 'sink'
> Availability: Always
> Capabilities:
> video/x-raw-rgb
> framerate: [ 0/1, 2147483647/1 ]
> width: [ 1, 2147483647 ]
> height: [ 1, 2147483647 ]
> ...
> I think the bpp requirement should be mentioned here, however, there
> seems not.

No, it cannot. What you see there are the template caps. The actual
capabilities of hardware related elements are known, once the element is
in READY state.

Stefan

>
> Thanks.
>
> Peter
>
>>
>>
>> David
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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