[FFmpeg-cvslog] avcodec/error_resilience: Use a symmetric check for skipping MV estimation

[Michael Niedermayer]

ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Tue Feb 19 18:41:42 2019 +0100| [63957591e951b9aafb3f37551020841dca25a1cd] | committer: Michael Niedermayer

avcodec/error_resilience: Use a symmetric check for skipping MV estimation

This speeds up the testcase by a factor of 4

Fixes: Timeout
Fixes: 13100/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV2_fuzzer-5767533905313792

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit e4289cb253e29e4d62dc46759eb1a45d8f6d82df)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=63957591e951b9aafb3f37551020841dca25a1cd
---

 libavcodec/error_resilience.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/error_resilience.c b/libavcodec/error_resilience.c
index 1abae53f41..35d0c609e5 100644
--- a/libavcodec/error_resilience.c
+++ b/libavcodec/error_resilience.c
@@ -437,7 +437,7 @@ static void guess_mv(ERContext *s)
     }
 
     if ((!(s->avctx->error_concealment&FF_EC_GUESS_MVS)) ||
-        num_avail <= mb_width / 2) {
+        num_avail <= FFMAX(mb_width, mb_height) / 2) {
         for (mb_y = 0; mb_y < mb_height; mb_y++) {
             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
                 const int mb_xy = mb_x + mb_y * s->mb_stride;