AppSink, GstBuffer and GdkPixbuf inside it.

[Tim-Philipp Müller]

On Wed, 2011-12-07 at 16:08 -0500, Erick Pérez Castellanos wrote:

> I'm having some little trouble with an app I'm coding. Here it is:
> The application put together a simple pipeline:
> -------------                 -------------
> | playbin2  |        ------>  | appsink   |
> -------------                 -------------
> I'm looping at gst_app_sink_pull_buffer method, and processing the
> GstBuffer message one by one. The problem is the when I got one message
> and extract build a GdkPixbuf from there, the ppixbuf I'm getting is the
> size of frame but the picture is comprised three times in it, I mean the
> pixbuf I got have the frame of the video but strecthed and three times
> repeated by the x axis.
> Don't know if I made myself clear, but, feel free to ask. The big
> question here is cause I'm doing the extraction the same way it does on
> GstGdkPixbufSink plugin. And there something escaping me.
> Did anyone have any ideas why is that happening ?
> 
> PS: When I disconnect the playbin2 element from the appsink, and
> playbin2 uses autovidesink, the video shows fine, so I think it's
> something on the extraction, I just can't get what's wrong there.

You're probably getting the video in the wrong format (e.g.
video/x-raw-yuv,format=I420) and not the RGB format/layout required.
Force appsink's caps to the same caps as gdkpixbufsink has on its
template and it should be fine.

(But really, why not use gdkpixbufsink?)

Cheers
 -Tim