The present default value of 0 will render the overlay video invisible.
A default of 1.0 is consistent with most common use cases.
Signed-off-by: Fei Wang <fei.w.w...@intel.com>
---
doc/filters.texi | 2 +-
libavfilter/vf_overlay_vaapi.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index a66b750d57..da0a946a6f 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -26170,7 +26170,7 @@ Default value is the height of input overlay video.
@item alpha
Set transparency of overlaid video. Allowed range is 0.0 to 1.0.
Higher value means lower transparency.
-Default value is @code{0.0}.
+Default value is @code{1.0}.
@end table
diff --git a/libavfilter/vf_overlay_vaapi.c b/libavfilter/vf_overlay_vaapi.c
index b3a624ae15..3e6a0de13f 100644
--- a/libavfilter/vf_overlay_vaapi.c
+++ b/libavfilter/vf_overlay_vaapi.c
@@ -380,7 +380,7 @@ static const AVOption overlay_vaapi_options[] = {
{ "h", "Overlay height",
OFFSET(overlay_oh), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, .flags =
FLAGS },
{ "alpha", "Overlay global alpha",
- OFFSET(alpha), AV_OPT_TYPE_FLOAT, { .dbl = 0.0}, 0.0, 1.0, .flags =
FLAGS},
+ OFFSET(alpha), AV_OPT_TYPE_FLOAT, { .dbl = 1.0}, 0.0, 1.0, .flags =
FLAGS},
{ NULL },
};
--
2.25.1
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