[gst-devel] Another GstAppSrc Question

[John Stowers]

On Fri, Dec 3, 2010 at 1:11 AM, ved kpl <ved.kpl at gmail.com> wrote:
> On Thu, Dec 2, 2010 at 4:24 PM, John Stowers
> <john.stowers.lists at gmail.com> wrote:
>> On Thu, Dec 2, 2010 at 10:52 PM, Prabhulinga Swamy B S
>> <prabhulingaswamy.bs at globaledgesoft.com> wrote:
>>> Hi John,
>>>
>>> You can just leave out the filter you are doing between 'appsrc' and
>>> 'ffmpegcolorspace'.
>>> That is not required since you are setting the caps of appsrc, that fine.
>>> Have you tried like this?
>>
>> Yeah. The solution was to add a videoparse filter (noted in another reply).
>
>   Also, u need not set any caps on appsrc.

Is this the recommended way of doing things? It feels like it breaks
abstraction / the point of caps. I mean I wanted to support streaming
multiple video types by only setting different caps on the appsrc and
letting ffmpegcolorspace convert to what was necessary.

So I suspect the root cause of why those caps failed to work remains
unknown. It does not matter even if I set all the rgb caps, still no
success.

Do you know how I might solve this while maintaining the abstraction
of video type through only the setting of caps?

Full code is here;
https://gist.github.com/725122

Thanks,

John

>>
>> Thanks,
>>
>> John
>
>
>
>>>
>>> app->pipeline = gst_parse_launch("appsrc name=mysource ! "
>>>        " ffmpegcolorspace ! videoscale method=1 ! theoraenc bitrate=150 ! udpsink "
>>>        " host=127.0.0.1 port=1234", NULL);
>>>
>>>
>>> Prabhu
>>>
>>>
>>>
>>> On 12/02/2010 11:28 AM, John Stowers wrote:
>>>> Hi All,
>>>>
>>>> I see quite a few similar questions to these on the gst-devel mailing
>>>> list, but none of them allowed me to get past my problem.
>>>>
>>>> I'm building a streaming video thing using gstreamer, the prototype
>>>> (works fine) is
>>>>
>>>> sender:
>>>> gst-launch -v videotestsrc !
>>>> video/x-raw-rgb,width=640,height=480,bpp=24,depth=24 !
>>>> ffmpegcolorspace ! videoscale method=1 ! theoraenc bitrate=150 ! udpsink
>>>> host=127.0.0.1 port=1234
>>>>
>>>> viewer:
>>>> gst-launch -v udpsrc port=1234 ! theoradec ! autovideosink
>>>>
>>>> I have been translating it to C starting with the appsrc-stream example.
>>>> I can't get it to negotiate the caps I set properly. The relevant
>>>> warning messages are;
>>>>
>>>> basetransform
>>>> gstbasetransform.c:1047:gst_base_transform_acceptcaps:<videoscale0>
>>>> transform could not transform video/x-raw-rgb, bpp=(int)24,
>>>> depth=(int)24, width=(int)640, height=(int)480 in anything we support
>>>> 0:00:00.178133697 10789  0x829a8d0 WARN           basetransform
>>>> gstbasetransform.c:1144:gst_base_transform_setcaps:<ffmpegcsp0>  FAILED
>>>> to configure caps<ffmpegcsp0:src>  to accept video/x-raw-yuv,
>>>> format=(fourcc)I420, framerate=(fraction)1/2147483647, width=(int)640,
>>>> height=(int)480
>>>>
>>>> The relevant code is;
>>>>
>>>> app->pipeline = gst_parse_launch("appsrc name=mysource !
>>>> video/x-raw-rgb,width=640,height=480,bpp=24,depth=24 !
>>>> ffmpegcolorspace ! videoscale method=1 ! theoraenc bitrate=150 ! udpsink
>>>> host=127.0.0.1 port=1234", NULL);
>>>>
>>>> <snip>
>>>>
>>>> caps = gst_caps_new_simple ("video/x-raw-rgb",
>>>>      "bpp",G_TYPE_INT,24,
>>>>      "depth",G_TYPE_INT,24,
>>>>       "width", G_TYPE_INT, 640,
>>>>       "height", G_TYPE_INT, 480,
>>>>       NULL);
>>>> gst_app_src_set_caps(GST_APP_SRC(app->appsrc), caps);
>>>>
>>>> Full source code is here
>>>> http://pastebin.com/PJuGVJLC
>>>>
>>>> Any pointers?
>>>>
>>>> John
>>>>
>>>>
>>>>
>>>
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>>
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>
> ------------------------------------------------------------------------------
> Increase Visibility of Your 3D Game App & Earn a Chance To Win $500!
> Tap into the largest installed PC base & get more eyes on your game by
> optimizing for Intel(R) Graphics Technology. Get started today with the
> Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs.
> http://p.sf.net/sfu/intelisp-dev2dev
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