[FFmpeg-cvslog] avformat/hlsenc: compute segment duration use current pts minus last segment end pts

[Steven Liu]

ffmpeg | branch: master | Steven Liu <lq at chinaffmpeg.org> | Wed Apr 29 20:39:22 2020 +0800| [a7bab199e50619df0a6d31a247f7186868e6e4e0] | committer: Steven Liu

avformat/hlsenc: compute segment duration use current pts minus last segment end pts

segment duration is using vs duration which compute by frame per second,
that can not fix problem of VFR video stream, so compute the duration
when split the segment, set the segment target duration use
current packet pts minus the prev segment end pts..

Reported-by: Zhao Jun <barryjzhao at tencent.com>
Reviewed-by: Zhao Jun <barryjzhao at tencent.com>
Signed-off-by: Steven Liu <liuqi05 at kuaishou.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a7bab199e50619df0a6d31a247f7186868e6e4e0
---

 libavformat/hlsenc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index 008a3f3947..10984dddb8 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -2463,7 +2463,8 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
         }
 
         if (vs->start_pos || hls->segment_type != SEGMENT_TYPE_FMP4) {
-            ret = hls_append_segment(s, hls, vs, vs->duration, vs->start_pos, vs->size);
+            double cur_duration =  (double)(pkt->pts - vs->end_pts) * st->time_base.num / st->time_base.den;
+            ret = hls_append_segment(s, hls, vs, cur_duration, vs->start_pos, vs->size);
             vs->end_pts = pkt->pts;
             vs->duration = 0;
             if (ret < 0) {