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deshake: variable used uninitialized

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Sometimes the scan finds nothing that qualifies for addition to
the array and pos is zero after the loops.  The code forces pos to
1 and the array is then processed as if it had one valid element in it,
producing some amusing but not very useful results.

I don't see the rationale for this.  If pos is zero coming out of the
loops, the only appropriate thing to do is set t->angle to zero.  The
attached patch does that.  It's worked properly in several tests so far.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Ray Simard 2012-01-20 18:19:46 -08:00 committed by Michael Niedermayer
parent bdd739e91c
commit 9ec39937f9
1 changed files with 9 additions and 8 deletions
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17
libavfilter/vf_deshake.c
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@ -292,14 +292,15 @@ static void find_motion(DeshakeContext *deshake, uint8_t *src1, uint8_t *src2,
}
}
pos = FFMAX(1, pos);
center_x /= pos;
center_y /= pos;
t->angle = clean_mean(angles, pos);
if (t->angle < 0.001)
t->angle = 0;
if (pos) {
center_x /= pos;
center_y /= pos;
t->angle = clean_mean(angles, pos);
if (t->angle < 0.001)
t->angle = 0;
} else {
t->angle = 0;
}
// Find the most common motion vector in the frame and use it as the gmv
for (y = deshake->ry * 2; y >= 0; y--) {