master vs. 1.5.1 - changing video-size on compositor input

[Peter Körner]

Hi

I have a project built with 1.5.1 as a base. It contains a compositor
within a pipeline similar to this:

> compositor name=mix !
>
video/x-raw,format=I420,width=1920,height=1080,framerate=25/1,pixel-aspect-ratio=1/1
!
> identity name=sig !
> queue !
> intervideosink channel=video_mix_out
>
> intervideosrc channel=video_cam1_mixer !
>
video/x-raw,format=I420,width=1920,height=1080,framerate=25/1,pixel-aspect-ratio=1/1
!
> videoscale !
> capsfilter name=caps_0 !
> mix.
>
> intervideosrc channel=video_cam2_mixer !
>
video/x-raw,format=I420,width=1920,height=1080,framerate=25/1,pixel-aspect-ratio=1/1
!
> videoscale !
> capsfilter name=caps_1 !
> mix.

during operation I change the x/y settings on the compositor but also
the caps on the capsfilter to something like:

> Reconfiguring Mixerpad 0 to x/y=0/273, alpha=1.00, zorder=1
> Reconfiguring Capsfilter 0 to video/x-raw, width=(int)950, height=(int)534
>
> Reconfiguring Mixerpad 1 to x/y=970/273, alpha=1.00, zorder=2
> Reconfiguring Capsfilter 1 to video/x-raw, width=(int)950, height=(int)534

which will, for example, produce a side-by-side view of the two inputs.
In gstreamer 1.5.1 this works pretty well. With the current master, I
get errors from videoaggregator (see attached log). I'm unsure if I
missed something in my application or if this is a regression somewhere
between 1.5.1 and master.

I also tested the very same code with 1.5.90 and there I additionally
get those errors:

** (python3:12647): CRITICAL **: gst_video_frame_map_id: assertion
'info->width <= meta->width' failed
0:00:03.599031061 12647      0x28720f0 WARN              compositor
compositor.c:513:gst_compositor_pad_prepare_frame:<mix> Could not map
input buffer

Regards, Peter
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