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rawvideoparse internal data stream error with bt2020 colorimetry if resolution is not 4k

Submitted by Florent Thiery @florent.thiery

Link to original bug (#776446)

Description

gst-launch-1.0 filesrc location=/dev/zero blocksize=3110400 num-buffers=1000 ! rawvideoparse width=1920 height=1080 framerate=30 format=nv12 ! "video/x-raw, format=(string)NV12, colorimetry=(string)bt2020" ! fakesink -v
ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal data stream error.

The following works okay:
gst-launch-1.0 filesrc location=/dev/zero blocksize=12441600 num-buffers=1000 ! rawvideoparse width=3840 height=2160 framerate=30 format=nv12 ! "video/x-raw, format=(string)NV12, colorimetry=(string)bt2020" ! fakesink -v