Playback, custom video-sink, different videos give different colors

[Paul Knopf]

When I playback different videos, some videos are green, some display
normal, but have an occasional purple flicker.

My setup:

gstreamer 1.12.2
playerbin > video-sink (property) -> (identity > video_convert > capsfilter
> appsink)

I set the caps filter on my custom video-sink bin to be
"video/x-raw,format=I420,colorimetry=bt709".

I take the samples from appsink and render them in my Qt5 application.

QVideoSurfaceFormat format(QSize(status.width, status.height),
QVideoFrame::Format_YUV420P);

I've tried multiple combinations of "colorimetry" on my capsfilter in the
video-sink bin, each having similar effects.

Here are my two dot files to compare.

https://gist.github.com/pauldotknopf/a22f765c723eb29d2959c8b6dc143d24

How do I get a consistent video-sink bin producing YUV buffers that behave
the same inside of Qt's rendering world?
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