[FFmpeg-cvslog] avfilter/fade: don't allow nb_frames == 0

[Gyan Doshi]

ffmpeg | branch: master | Gyan Doshi <ffmpeg at gyani.pro> | Mon Jul 29 11:11:12 2019 +0530| [43891ea8ab286a08e731ebac78123c4f1b1d35ca] | committer: Gyan Doshi

avfilter/fade: don't allow nb_frames == 0

In filter init, there's a division by nb_frames but value isn't checked.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=43891ea8ab286a08e731ebac78123c4f1b1d35ca
---

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

diff --git a/libavfilter/vf_fade.c b/libavfilter/vf_fade.c
index 17eca109b6..bec765a09e 100644
--- a/libavfilter/vf_fade.c
+++ b/libavfilter/vf_fade.c
@@ -381,9 +381,9 @@ static const AVOption fade_options[] = {
     { "s",           "Number of the first frame to which to apply the effect.",
                                                     OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
     { "nb_frames",   "Number of frames to which the effect should be applied.",
-                                                    OFFSET(nb_frames),   AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },
+                                                    OFFSET(nb_frames),   AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
     { "n",           "Number of frames to which the effect should be applied.",
-                                                    OFFSET(nb_frames),   AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },
+                                                    OFFSET(nb_frames),   AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
     { "alpha",       "fade alpha if it is available on the input", OFFSET(alpha),       AV_OPT_TYPE_BOOL, {.i64 = 0    }, 0,       1, FLAGS },
     { "start_time",  "Number of seconds of the beginning of the effect.",
                                                     OFFSET(start_time),  AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },