Mathieu Duponchelle c07e2a89ba line21enc: heavily constrain video height ...

We can only determine a correct placement for the CC line
with:

* height == 525 (standard NTSC, line 21 / 22)
* height == 486 (NTSC usable lines + 6 lines for VBI, line 1 / 2)

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1554>

2020-09-09 19:38:58 +02:00

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