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avcodec/mpeg4videodec: also for empty partitioned slices 

Fixes assertion failure
Fixes: id_acf3e47f864e1ee4c7b86c0653e0ff31e5bde56e.m4v

Found-by: Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 70f13abb4f)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-12-19 23:21:33 +01:00
parent 5124bf8ea6
commit 4bfaa040fc
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpeg4videodec.c
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@ -882,7 +882,7 @@ int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END; const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
mb_num = mpeg4_decode_partition_a(ctx); mb_num = mpeg4_decode_partition_a(ctx);
if (mb_num < 0) { if (mb_num <= 0) {
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x, s->mb_y, part_a_error); s->mb_x, s->mb_y, part_a_error);
return -1; return -1;