bb7fd94eebbc6470588cc88ca6713e5ac5e419d3

It was wrong in colorspaces where horizontal and vertical chroma
subsampling are not the same, e.g. 422.
(cherry picked from commit 0884dd5a1b
)
Conflicts:
libavcodec/mpegvideo.c
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.
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