vaapipostproc: upstream caps negotiation fails

Submitted by Tomas Rataj

Link to original bug (#785706)

Description

Created attachment 356755
GST_DEBUG=5

Hi,

Following pipelines are not working:

gst-launch-1.0 appsrc is-live=true caps="video/x-raw,format=BGRx,width=1280,height=1024,framerate=20/1" ! videorate ! vaapipostproc ! video/x-raw,format=NV12,framerate=10/1 ! fakesink

gst-launch-1.0 appsrc is-live=true caps="video/x-raw,format=BGRx,width=1280,height=1024,framerate=20/1" ! videorate ! video/x-raw,framerate=10/1 ! vaapipostproc ! video/x-raw,format=NV12 ! fakesink

with warning:

WARN basetransform gstbasetransform.c:1346:gst_base_transform_setcaps:<videorate0> transform could not transform video/x-raw, format=(string)BGRx, width=(int)1280, height=(int)1024, framerate=(fraction)20/1 in anything we support

Pipeline with swapped vaapipostproc and videorate is working correctly:

gst-launch-1.0 appsrc is-live=true caps="video/x-raw,format=BGRx,width=1280,height=1024,framerate=20/1" ! vaapipostproc ! videorate ! video/x-raw,format=NV12,framerate=10/1 ! fakesink

Attachment 356755, "GST_DEBUG=5":
GST_DEBUG_5.zip

Version: 1.12.x