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Marton Balint 2cbe6bac03 avfilter/vf_framerate: change blend factor precision
This is done mainly in preparation for the SIMD patches.

- for the 8-bit input, decrease the blend factor precision to 7-bit.
- for the 16-bit input, increase the blend factor precision to 15-bit.
- make sure the blend functions are not called with 0 or maximum blending
  factors, because we don't want the signed factor integers to overflow.

Fate test changes are due to different rounding.

Signed-off-by: Marton Balint <cus@passwd.hu>
2018-01-28 18:50:50 +01:00
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