[FFmpeg-devel] [mpeg4video] Fix undefined shift on assumed 8-bit input.

[Dale Curtis]

decode_user_data() attempts to create an integer |build|
value with 8 bits of spacing for 3 components. However
each component is an int32_t, so shifting each component
is undefined for values outside of the 8 bit range.

This patch simply clamps input to 8-bits per component.

Signed-off-by: Dale Curtis <dalecurtis at chromium.org>
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