[gst-devel] video scaling elemen in application

[René Stadler]

Am Donnerstag, den 04.10.2007, 14:15 -0700 schrieb Pete Nam:
> Hi,
> I have a simple yet unsolved question:
> let says i have the command line:
> gst-launch filesrc location=myfile.avi ! decodebin !
> video/x-raw-rgb,width=1200 ! ffmpegcolorspace ! directdrawsink
> 
> This works fine, and I'm able to rescale the video to desired width.
> 
> Now I want to have the same in my application. I am able to create and
> link together all elements (filesrc, decodebin, ffmpegcolorspace and
> directdrawsink), and it displays my video as well. But how to make the
> "video/x-raw-rgb,width=1200" part into an element to create? If I look
> at the videoscale plugin for ex, I don't see any property to set for
> video dimensions....
> Can anyone tell me what I should use for this purpose?
> Regards, 
> Pete

When gst-launch sees a caps string, it creates a capsfilter element.
The capsfilter element has a "caps" property, which is set to the result
of running gst_caps_from_string on the provided caps string.  You can
replicate that easily, creating the capsfilter element just like any
other element, adding it to the pipeline and linking it in.

-- 
Regards,
  René Stadler