[FFmpeg-cvslog] ffmpeg: check timebase validity before using it.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Mon Oct 15 20:35:01 2012 +0200| [547ec4d3034d81f6d1a0e84bf58168d35f50baab] | committer: Michael Niedermayer

ffmpeg: check timebase validity before using it.

Found-by: Daemon404
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=547ec4d3034d81f6d1a0e84bf58168d35f50baab
---

 ffmpeg_filter.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ffmpeg_filter.c b/ffmpeg_filter.c
index d0f25d8..0a3b2cd 100644
--- a/ffmpeg_filter.c
+++ b/ffmpeg_filter.c
@@ -561,7 +561,7 @@ static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
     if (!ist->framerate.num) {
         AVRational codec_fr = av_inv_q(ist->st->codec->time_base);
         codec_fr.den *= ist->st->codec->ticks_per_frame;
-        if(av_q2d(codec_fr) < av_q2d(fr)*0.7)
+        if(codec_fr.num>0 && codec_fr.den>0 && av_q2d(codec_fr) < av_q2d(fr)*0.7)
             fr = codec_fr;
     }