[FFmpeg-cvslog] avformat/movenc: Check frame rate before use.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Nov 17 19:02:14 2016 +0100| [709c87109dc856abff9c905dfda3ca954453828a] | committer: Michael Niedermayer

avformat/movenc: Check frame rate before use.

Fixes division by 0
This is similar to how avg_frame_rate is checked elsewhere
Fixes: 6d24add0455f41b1b45b7ba615cd46f3/asan_generic_dc34c3_5480_0a2ef411cae999b9871ed71a2e481b71.mov

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=709c87109dc856abff9c905dfda3ca954453828a
---

 libavformat/movenc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 473aac0..5452ff7 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -4291,7 +4291,9 @@ static int mov_write_uuidprof_tag(AVIOContext *pb, AVFormatContext *s)
     AVCodecParameters *video_par = s->streams[0]->codecpar;
     AVCodecParameters *audio_par = s->streams[1]->codecpar;
     int audio_rate = audio_par->sample_rate;
-    int64_t frame_rate = (video_st->avg_frame_rate.num * 0x10000LL) / video_st->avg_frame_rate.den;
+    int64_t frame_rate = video_st->avg_frame_rate.den ?
+                        (video_st->avg_frame_rate.num * 0x10000LL) / video_st->avg_frame_rate.den :
+                        0;
     int audio_kbitrate = audio_par->bit_rate / 1000;
     int video_kbitrate = FFMIN(video_par->bit_rate / 1000, 800 - audio_kbitrate);