How to change colorspace on the fly

[AlannY-2]

Hi there.

I have a dummy question. I need video in video/x-raw-rgb, but
<videotestsrc> generates video in video/x-raw-yuv format. How to convert
it? I found ffmpegcolorspace element, but really not understand how to
use it ;-)

Thank you.

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[Thijs Vermeir-2]

Hi,

AlannY wrote:
> Hi there.
>
> I have a dummy question. I need video in video/x-raw-rgb, but
> <videotestsrc> generates video in video/x-raw-yuv format. How to convert
> it? I found ffmpegcolorspace element, but really not understand how to
> use it ;-)
>  
You can use ffmpegcolorspace like this:
gst-launch -v videotestsrc ! ffmpegcolorspace ! video/x-raw-rgb ! fakesink

But you don't need ffmpegcolorspace because the videotestsrc can
also output video in rgb. (Try gst-inspect videotestsrc)

To force videotestsrc to use rgb use something like this:
gst-launch -v videotestsrc ! video/x-raw-rgb ! fakesink

Gr,
Thijs

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[AlannY-2]

Thijs Vermeir wrote:
 > Hi,
 >
 > You can use ffmpegcolorspace like this:
 > gst-launch -v videotestsrc ! ffmpegcolorspace ! video/x-raw-rgb !
fakesink
 >
 > But you don't need ffmpegcolorspace because the videotestsrc can
 > also output video in rgb. (Try gst-inspect videotestsrc)
 >
 > To force videotestsrc to use rgb use something like this:
 > gst-launch -v videotestsrc ! video/x-raw-rgb ! fakesink
 >
 > Gr,
 > Thijs
 >

And how to do it programmaly? I'm trying, but everything I get
video/x-raw-yuv ;-(

(example)
source = gst_element_factory_make("videotestsrc", "source");
colorspace = gst_element_factory_make("ffmpegcolorspace", "colorspace");
myplugin = gst_element_factory_make("myplugin", "myplugin");
video_sink = gst_element_factory_make("xvimagesink", "video_sink");

gst_bin_add_many(GST_BIN(pipeline), source, colorspace, libass,
video_sink, NULL);

caps = gst_caps_new_simple("video/x-raw-rgb", NULL);
gst_element_link_filtered(source, colorspace, caps);
gst_caps_unref(caps);

gst_element_link(colorspace, myplugin);
gst_element_link(mypluin, video_sink);

Nothing works. Myplugin still receives video/x-raw-yuv

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[Julien Isorce]

replace xvimagesink by ximagesink.

ffmpegcolorspace is there not really needed because videotestsrc can output rgb.

You forgot to add myplugin into the bin. (libass)

Julien

2008/4/11, AlannY <[hidden email]>:

Thijs Vermeir wrote:
  > Hi,

>
  > You can use ffmpegcolorspace like this:
  > gst-launch -v videotestsrc ! ffmpegcolorspace ! video/x-raw-rgb !
fakesink
  >
  > But you don't need ffmpegcolorspace because the videotestsrc can
  > also output video in rgb. (Try gst-inspect videotestsrc)
  >
  > To force videotestsrc to use rgb use something like this:
  > gst-launch -v videotestsrc ! video/x-raw-rgb ! fakesink
  >
  > Gr,
  > Thijs
  >


And how to do it programmaly? I'm trying, but everything I get
video/x-raw-yuv ;-(

(example)
source = gst_element_factory_make("videotestsrc", "source");
colorspace = gst_element_factory_make("ffmpegcolorspace", "colorspace");
myplugin = gst_element_factory_make("myplugin", "myplugin");
video_sink = gst_element_factory_make("xvimagesink", "video_sink");

gst_bin_add_many(GST_BIN(pipeline), source, colorspace, libass,
video_sink, NULL);

caps = gst_caps_new_simple("video/x-raw-rgb", NULL);
gst_element_link_filtered(source, colorspace, caps);
gst_caps_unref(caps);

gst_element_link(colorspace, myplugin);
gst_element_link(mypluin, video_sink);

Nothing works. Myplugin still receives video/x-raw-yuv


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