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avcodec/vc1: fix B predictor validity for 4-MV MBs

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The B predictor for 4-MV MBs in interlace field pictures is not used
for blocks 0 and 2 when the picture is 1 MB wide.

Signed-off-by: Jerome Borsboom <jerome.borsboom@carpalis.nl>
This commit is contained in:
Jerome Borsboom
2019-01-14 09:05:24 +01:00
committed by Carl Eugen Hoyos
parent d52a1be4e3
commit fc6e53b0b6
1 changed files with 2 additions and 0 deletions
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2
libavcodec/vc1_pred.c
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@@ -289,6 +289,8 @@ void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
case 3: case 3:
off = -1; off = -1;
} }
if (v->field_mode && s->mb_width == 1)
b_valid = b_valid && c_valid;
} }
if (v->field_mode) { if (v->field_mode) {