diff options
| -rw-r--r-- | doc/filters.texi | 3 | ||||
| -rw-r--r-- | libavfilter/vf_subtitles.c | 4 |
2 files changed, 6 insertions, 1 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index c898c43557..19ca055076 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -14005,6 +14005,9 @@ correctly scale the fonts if the aspect ratio has been changed. Set a directory path containing fonts that can be used by the filter. These fonts will be used in addition to whatever the font provider uses. +@item alpha +Process alpha channel, by default alpha channel is untouched. + @item charenc Set subtitles input character encoding. @code{subtitles} filter only. Only useful if not UTF-8. diff --git a/libavfilter/vf_subtitles.c b/libavfilter/vf_subtitles.c index 805ee2d7e0..66a564699a 100644 --- a/libavfilter/vf_subtitles.c +++ b/libavfilter/vf_subtitles.c @@ -54,6 +54,7 @@ typedef struct AssContext { char *charenc; char *force_style; int stream_index; + int alpha; uint8_t rgba_map[4]; int pix_step[4]; ///< steps per pixel for each plane of the main output int original_w, original_h; @@ -69,6 +70,7 @@ typedef struct AssContext { {"f", "set the filename of file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \ {"original_size", "set the size of the original video (used to scale fonts)", OFFSET(original_w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \ {"fontsdir", "set the directory containing the fonts to read", OFFSET(fontsdir), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \ + {"alpha", "enable processing of alpha channel", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, FLAGS }, \ /* libass supports a log level ranging from 0 to 7 */ static const int ass_libavfilter_log_level_map[] = { @@ -140,7 +142,7 @@ static int config_input(AVFilterLink *inlink) { AssContext *ass = inlink->dst->priv; - ff_draw_init(&ass->draw, inlink->format, 0); + ff_draw_init(&ass->draw, inlink->format, ass->alpha ? FF_DRAW_PROCESS_ALPHA : 0); ass_set_frame_size (ass->renderer, inlink->w, inlink->h); if (ass->original_w && ass->original_h) |