[FFmpeg-cvslog] avfilter/signature_lookup: Fix 2 differences to the refernce SW

[Michael Niedermayer]

ffmpeg | branch: release/6.1 | Michael Niedermayer <michael at niedermayer.cc> | Mon Apr 22 00:43:19 2024 +0200| [572985605f04baaeeb01730d54475398cc7d1b40] | committer: Michael Niedermayer

avfilter/signature_lookup: Fix 2 differences to the refernce SW

Fixes: CID1403227 Division or modulo by float zero

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 25cb66369e7b81bd280f0bdd6d51a0e2e11881e3)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=572985605f04baaeeb01730d54475398cc7d1b40
---

 libavfilter/signature_lookup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavfilter/signature_lookup.c b/libavfilter/signature_lookup.c
index ad012ecced..208e9cb936 100644
--- a/libavfilter/signature_lookup.c
+++ b/libavfilter/signature_lookup.c
@@ -501,10 +501,10 @@ static MatchingInfo evaluate_parameters(AVFilterContext *ctx, SignatureContext *
             continue; /* matching sequence is too short */
         if ((double) goodfcount / (double) fcount < sc->thit)
             continue;
-        if ((double) goodfcount*0.5 < FFMAX(gooda, goodb))
+        if ((double) goodfcount*0.5 <= FFMAX(gooda, goodb))
             continue;
 
-        meandist = (double) goodfcount / (double) distsum;
+        meandist = (double) distsum / (double) goodfcount;
 
         if (meandist < minmeandist ||
                 status == (STATUS_END_REACHED | STATUS_BEGIN_REACHED) ||