commit 99f7e327d6d034b855ae4a663ff5ac73dbbb22f7
Author: Eejya Singh <[email protected]>
Date:   Wed Jan 28 17:41:42 2015 +0530

    Adding Force Style option in Subtitles Filter

    Signed-off-by: Eejya Singh <[email protected]>

diff --git a/doc/filters.texi b/doc/filters.texi
index 261fd24..893b2f4 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8470,6 +8470,10 @@ useful if not UTF-8.

 @item stream_index, si
 Set subtitles stream index. @code{subtitles} filter only.
+
+@item force_style
+Set desired style for the customization of subtitles.It follows ASS style format.
+
 @end table

 If the first key is not specified, it is assumed that the first value
@@ -8496,6 +8500,16 @@ To render the second subtitles stream from that file, use:
 subtitles=video.mkv:si=1
 @end example

+To change the font of subtitles stream from file, use:
+@example
+subtitles=video.mkv:force_style=FontName=Arial
+@end example
+
+To change the color and formatting of subtitles stream from file, use:
+@example
+subtitles='video.mkv:force_style=FontName=Arial,PrimaryColour=255'
+@end example
+
 @section super2xsai

 Scale the input by 2x and smooth using the Super2xSaI (Scale and
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 50967f4..7ec374d 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -31,7 +31,7 @@

 #define LIBAVFILTER_VERSION_MAJOR  5
 #define LIBAVFILTER_VERSION_MINOR  6
-#define LIBAVFILTER_VERSION_MICRO 100
+#define LIBAVFILTER_VERSION_MICRO 101

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \
diff --git a/libavfilter/vf_subtitles.c b/libavfilter/vf_subtitles.c
index be4c6a5..948348a 100644
--- a/libavfilter/vf_subtitles.c
+++ b/libavfilter/vf_subtitles.c
@@ -51,6 +51,7 @@ typedef struct {
     ASS_Track    *track;
     char *filename;
     char *charenc;
+    char *force_style;
     int stream_index;
     uint8_t rgba_map[4];
     int     pix_step[4];       ///< steps per pixel for each plane of the main output
@@ -260,6 +261,7 @@ static const AVOption subtitles_options[] = {
     {"charenc",      "set input character encoding", OFFSET(charenc),      AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
     {"stream_index", "set stream index",             OFFSET(stream_index), AV_OPT_TYPE_INT,    { .i64 = -1 }, -1,       INT_MAX,  FLAGS},
     {"si",           "set stream index",             OFFSET(stream_index), AV_OPT_TYPE_INT,    { .i64 = -1 }, -1,       INT_MAX,  FLAGS},
+    {"force_style",  "force subtitle style",         OFFSET(force_style),  AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
     {NULL},
 };

@@ -389,6 +391,25 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
     if (ass->charenc)
         av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
     ret = avcodec_open2(dec_ctx, dec, &codec_opts);
+
+    if (ass->force_style) {
+        char **list = NULL;
+        char *temp = NULL;
+        char *ptr = av_strtok(ass->force_style, ",", &temp);
+        int i = 0;
+        while(ptr)
+        {
+            av_dynarray_add(&list, &i, ptr);
+            if(!list)
+                av_log(ctx, 0, "Error forcing style\n");
+            ptr = av_strtok(NULL, ",", &temp);
+        }
+        av_dynarray_add(&list, &i, NULL);
+        if(!list)
+                av_log(ctx, 0, "Error forcing style\n");
+        ass_set_style_overrides(ass->library, list);
+        av_free(list);
+    }
     if (ret < 0)
         goto end;