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dashenc: check pts to prevent division by zero error 

this usecase will cause a division by zero trap:

1. dashenc has received one frame
2. os->max_pts and os->start_pts have same value
3. delta between max_pts and start_pts is 0
4. av_rescale_q(0, x, y) returns 0
5. this value is used as denominator in division
6. Bang! -> segfault

this fix checks that max_pts > start_pts.
the fix has been tested and works.

Signed-off-by: Alfred E. Heggestad <alfred.heggestad@gmail.com>
Reviewed-by: Jeyapal, Karthick <kjeyapal@akamai.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Alfred E. Heggestad 2020-01-30 10:58:01 +01:00 committed by James Almer
parent 53b4128ea0
commit d550a28560
1 changed files with 1 additions and 1 deletions
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2
libavformat/dashenc.c
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@ -1883,7 +1883,7 @@ static int dash_flush(AVFormatContext *s, int final, int stream)
st->time_base,
AV_TIME_BASE_Q));
if (!os->muxer_overhead)
if (!os->muxer_overhead && os->max_pts > os->start_pts)
os->muxer_overhead = ((int64_t) (range_length - os->total_pkt_size) *
8 * AV_TIME_BASE) /
av_rescale_q(os->max_pts - os->start_pts,