Failed to negociate

[adrien_sch]

I applied the patch to my clone, and I still observe the problem.

Command : 

gst-launch-1.0 videotestsrc ! video/x-raw, format=I420 ! funnel !
videoconvert ! clockoverlay ! videoconvert ! videobox border-alpha=0 top=-1
bottom=-1 ! videoconvert ! videomixer name=mix ! videoconvert ! xvimagesink
sync=FALSE async=FALSE videotestsrc ! video/x-raw, format=I420 ! funnel !
videoconvert ! clockoverlay ! videoconvert ! videobox border-alpha=0 top=-1
left=-300 ! videoconvert ! mix.

Debug trace : 

Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
0:00:00.162643152  7676       0xd64230 WARN           basetransform
gstbasetransform.c:1348:gst_base_transform_setcaps:<videoconvert5> transform
could not transform video/x-raw, format=(string)I420, width=(int)320,
height=(int)240, framerate=(fraction)30/1, pixel-aspect-ratio=(fraction)1/1
in anything we support
0:00:00.163872302  7676       0xd52ad0 WARN                 default
gstvideopool.c:171:video_buffer_pool_set_config:<videobufferpool0> no caps
in config
0:00:00.165845216  7676       0xd64230 WARN                GST_PADS
gstpad.c:3577:gst_pad_peer_query:<clockoverlay1:src> could not send sticky
events
0:00:00.171503717  7676       0xd64230 WARN                GST_PADS
gstpad.c:3577:gst_pad_peer_query:<clockoverlay1:src> could not send sticky
events
0:00:00.171589722  7676       0xd64230 WARN                 default
gstvideopool.c:171:video_buffer_pool_set_config:<videobufferpool3> no caps
in config
0:00:00.184633099  7676       0xd64230 WARN                GST_PADS
gstpad.c:3577:gst_pad_peer_query:<clockoverlay1:src> could not send sticky
events
0:00:00.191157250  7676       0xd64230 WARN                 basesrc
gstbasesrc.c:2812:gst_base_src_loop:<videotestsrc1> error: Internal data
flow error.
0:00:00.191187347  7676       0xd64230 WARN                 basesrc
gstbasesrc.c:2812:gst_base_src_loop:<videotestsrc1> error: streaming task
paused, reason not-negotiated (-4)
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc1:
Internal data flow error.
Additional debug info:
gstbasesrc.c(2812): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc1:
streaming task paused, reason not-negotiated (-4)
Execution ended after 115576609 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

Observation : 
Reproduction rate 1/2

May I open a bug ? 




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