flvdec: Add comment about the 5 second threshold

Idea-by: Reimar
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 5aed3eda7635735fb34d5c29feedb31d339a7477..2ebef63fec6758ae55c121b319cbd89fdebb7744 100644 (file)
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -196,7 +196,7 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream
         size1 = avio_rb24(ioc);
         dts   = avio_rb24(ioc);
         dts  |= avio_r8(ioc) << 24;
-        if (size0 > filepositions[1] || FFABS(dts - times[1]*1000)>5000)
+        if (size0 > filepositions[1] || FFABS(dts - times[1]*1000)>5000/*arbitraray threshold to detect invalid index*/)
             goto invalid;
          for(i = 0; i < timeslen; i++)
              av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);