videotestsrc to generate rgb565 video stream failed

[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
>
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