From: Zhao Zhili <zhiliz...@tencent.com>
./ffmpeg -i ~/Pictures/test.jpg -vf 'gblur=sigma=0' -f null -
...
src/libavfilter/vf_gblur.c:260:59: runtime error: division by zero
src/libavfilter/vf_gblur.c:261:26: runtime error: division by zero
---
libavfilter/vf_gblur.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/libavfilter/vf_gblur.c b/libavfilter/vf_gblur.c
index 2e587f6a0a..e057937fb7 100644
--- a/libavfilter/vf_gblur.c
+++ b/libavfilter/vf_gblur.c
@@ -37,11 +37,17 @@
#define OFFSET(x) offsetof(GBlurContext, x)
#define FLAGS
AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
+/* Consider the three-sigma rule, for minimum radius of 1 sigma should not
+ * be smaller than 1/3. Relax it to 0.25 if the user want to try.
+ */
+#define SIGMA_MIN 0.25
+#define SIGMA_MAX 1024.0
+
static const AVOption gblur_options[] = {
- { "sigma", "set sigma", OFFSET(sigma), AV_OPT_TYPE_FLOAT,
{.dbl=0.5}, 0.0, 1024, FLAGS },
+ { "sigma", "set sigma", OFFSET(sigma), AV_OPT_TYPE_FLOAT,
{.dbl=0.5}, SIGMA_MIN, SIGMA_MAX, FLAGS },
{ "steps", "set number of steps", OFFSET(steps), AV_OPT_TYPE_INT,
{.i64=1}, 1, 6, FLAGS },
{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT,
{.i64=0xF}, 0, 0xF, FLAGS },
- { "sigmaV", "set vertical sigma", OFFSET(sigmaV), AV_OPT_TYPE_FLOAT,
{.dbl=-1}, -1, 1024, FLAGS },
+ { "sigmaV", "set vertical sigma", OFFSET(sigmaV), AV_OPT_TYPE_FLOAT,
{.dbl=-1}, -1, SIGMA_MAX, FLAGS },
{ NULL }
};
@@ -244,7 +250,7 @@ static int config_input(AVFilterLink *inlink)
if (!s->buffer)
return AVERROR(ENOMEM);
- if (s->sigmaV < 0) {
+ if (s->sigmaV < SIGMA_MIN) {
s->sigmaV = s->sigma;
}
ff_gblur_init(s);
--
2.22.0
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
