clock overlay tearing

[Adam Langley]

Hi,

I am capturing a live stream from uvch264src (v1.0) and have a clockoverlay
in my pipeline.
The resulting stream look like this:
http://postimg.org/image/5w8flz49r/

The clock text has all these (animated) streaky scanlines missing from it.
I belive the scanlines are actually where the text pixels are NOT painted
(rather than painted in the background color), because if I don't have a
background on the clock, the video pixels show through in the scanlines.

What could be causing that?

Thanks

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