avformat/dashdec: Fix calc_cur_seg_no if availability_start_time not

Reviewed-by: Steven Liu <lq@chinaffmpeg.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index c6dddeb98f..85fbe6aacc 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -1296,7 +1296,7 @@ static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls)
             if (pls->presentation_timeoffset) {
                 num = pls->presentation_timeoffset * pls->fragment_timescale / pls->fragment_duration;
             } else if (c->publish_time > 0 && !c->availability_start_time) {
-                num = pls->first_seq_no + (((c->publish_time - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
+                num = pls->first_seq_no + (((c->publish_time - c->time_shift_buffer_depth + pls->fragment_duration) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
             } else {
                 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
             }