Allows user to specify a frame interval at which textfile is reloaded.
---
doc/filters.texi | 6 ++++--
libavfilter/vf_drawtext.c | 6 +++---
2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index b3ae139613..1ecc03eeae 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -11271,8 +11271,10 @@ text data in detection bboxes of side data. So please
do not use this parameter
if you are not sure about the text source.
@item reload
-If set to 1, the @var{textfile} will be reloaded before each frame.
-Be sure to update it atomically, or it may be read partially, or even fail.
+The @var{textfile} will be reloaded at specified frame interval.
+Be sure to update @var{textfile} atomically, or it may be read partially,
+or even fail.
+Range is 0 to INT_MAX. Default is 0.
@item x
@item y
diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index 2a88692cbd..6ba3f6622a 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -198,7 +198,7 @@ typedef struct DrawTextContext {
AVRational tc_rate; ///< frame rate for timecode
AVTimecode tc; ///< timecode context
int tc24hmax; ///< 1 if timecode is wrapped to 24
hours, 0 otherwise
- int reload; ///< reload text file for each frame
+ int reload; ///< reload text file at specified frame
interval
int start_number; ///< starting frame number for
n/frame_num var
char *text_source_string; ///< the string to specify text data
source
enum AVFrameSideDataType text_source;
@@ -245,7 +245,7 @@ static const AVOption drawtext_options[]= {
{"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate),
AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"r", "set rate (timecode only)", OFFSET(tc_rate),
AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"rate", "set rate (timecode only)", OFFSET(tc_rate),
AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
- {"reload", "reload text file for each frame",
OFFSET(reload), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reload", "reload text file at specified frame interval",
OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
{ "alpha", "apply alpha while rendering", OFFSET(a_expr),
AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
{"fix_bounds", "check and fix text coords to avoid clipping",
OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"start_number", "start frame number for n/frame_num variable",
OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
@@ -1565,7 +1565,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame
*frame)
}
}
- if (s->reload) {
+ if (s->reload && !(inlink->frame_count_out % s->reload)) {
if ((ret = load_textfile(ctx)) < 0) {
av_frame_free(&frame);
return ret;
