[gst-devel] Buffer size mismatch in custom plugin

[Tim Müller]

On Fri, 2008-04-11 at 11:02 +0400, AlannY wrote:

> I'm writing a custom video filter (as a custom plugin) (still newbie). 
> So, in the _chain() function I checked buffer (GstBuffer) size:
> 
> (example)
> static GstFlowReturn
> gst_myfilter_chain (GstPad *pad,
>                      GstBuffer *buf)
> {
>    g_print("%d\n", buf->size);
>    g_print("%d\n", width*height*3);
> 
>    return gst_pad_push (filter->srcpad, buf);
> }
> 
> I got the following messages:
> 153600
> 230400
> 
> As you can see buf->size is smaller then frame size ( width*height*3 ). 
> Why? How can I write something in buffer if it's smaller then I 
> expected. I got Segmentation fault when trying to do it.

Well, what are the caps/formats involved here? RGB/YUV? Which? What are
the template caps of your plugin?

Cheers
 -Tim