avformat/assdec: do not drop duplicate subtitles

Duplicates are perfectly legitimate with this format. A correct
renderer will typically show them stacked.

diff --git a/libavformat/assdec.c b/libavformat/assdec.c
index 5423c03f1468ea3018a415f2456cc31b48907fea..a9a2efac2e4f8c431de8803e86518bf9368179de 100644 (file)
--- a/libavformat/assdec.c
+++ b/libavformat/assdec.c
@@ -125,6 +125,8 @@ static int ass_read_header(AVFormatContext *s)
     av_bprint_init(&line,   0, AV_BPRINT_SIZE_UNLIMITED);
     av_bprint_init(&rline,  0, AV_BPRINT_SIZE_UNLIMITED);
 
+    ass->q.keep_duplicates = 1;
+
     for (;;) {
         int64_t pos = get_line(&line, &tr);
         int64_t ts_start = AV_NOPTS_VALUE;