libavformat/mov.c

@@ -5845,7 +5845,7 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
             } else if (has_sidx && !c->use_tfdt || fallback_sidx) {
                 // FIXME: sidx earliest_presentation_time is *PTS*, s.b.
                 // pts = frag_stream_info->sidx_pts;
-                dts = frag_stream_info->sidx_pts;
+                dts = frag_stream_info->sidx_pts - sc->time_offset;
                 av_log(c->fc, AV_LOG_DEBUG, "found sidx time %"PRId64
                         ", using it for dts\n", frag_stream_info->sidx_pts);
             } else {

libavformat/movenc.c

@@ -5690,7 +5690,8 @@ static int mov_write_sidx_tag(AVIOContext *pb,
 
     if (track->entry) {
         entries = 1;
-        presentation_time = track->cluster[0].dts + track->cluster[0].cts;
+        presentation_time = track->cluster[0].dts + track->cluster[0].cts -
+                            track->start_dts - track->start_cts;
         duration = track->end_pts -
                    (track->cluster[0].dts + track->cluster[0].cts);
         starts_with_SAP = track->cluster[0].flags & MOV_SYNC_SAMPLE;
@@ -5705,6 +5706,9 @@ static int mov_write_sidx_tag(AVIOContext *pb,
         if (entries <= 0)
             return 0;
         presentation_time = track->frag_info[0].time;
+        /* presentation_time <= 0 is handled by mov_add_tfra_entries() */
+        if (presentation_time > 0)
+            presentation_time -= track->start_dts + track->start_cts;
     }
 
     avio_wb32(pb, 0); /* size */

tests/ref/fate/movenc

@@ -101,28 +101,28 @@ write_data len 1223, time nopts, type header atom ftyp
 041ac8efc35a0d023c26d05eedb20403 1223 delay-moov-elst-signal-init
 write_data len 1004, time -33333, type sync atom sidx
 write_data len 996, time 966667, type sync atom sidx
-5a583d89318827d2569eecbeaa18c238 996 delay-moov-elst-signal-second-frag
+69c9025ffb10302c7b5c2ed9fde86c44 996 delay-moov-elst-signal-second-frag
 write_data len 148, time nopts, type trailer atom -
 write_data len 1223, time nopts, type header atom ftyp
 041ac8efc35a0d023c26d05eedb20403 1223 delay-moov-elst-signal-init-discont
 write_data len 996, time 966667, type sync atom sidx
-5a583d89318827d2569eecbeaa18c238 996 delay-moov-elst-signal-second-frag-discont
+69c9025ffb10302c7b5c2ed9fde86c44 996 delay-moov-elst-signal-second-frag-discont
 write_data len 110, time nopts, type trailer atom -
 write_data len 1247, time nopts, type header atom ftyp
 80511a51d1ac9cde62337eed7176ae03 1247 delay-moov-elst-signal-init-discont-largets
 write_data len 996, time 279621233333, type sync atom sidx
-dc695d65e8a0cdafee28acd8a5ccf81a 996 delay-moov-elst-signal-second-frag-discont-largets
+471fc64644a6bf4065c489fe4e04be7d 996 delay-moov-elst-signal-second-frag-discont-largets
 write_data len 110, time nopts, type trailer atom -
 write_data len 1223, time nopts, type header atom ftyp
 write_data len 2572, time -333333, type sync atom sidx
 write_data len 996, time 5166667, type sync atom sidx
 write_data len 148, time nopts, type trailer atom -
-d37a7eda807912b9ed05ccfe003a9e4f 4939 vfr
+5c873f6e37d5af09e3c6329cf94cd6ca 4939 vfr
 write_data len 1223, time nopts, type header atom ftyp
 write_data len 2572, time -333333, type sync atom sidx
 write_data len 996, time 5166667, type sync atom sidx
 write_data len 148, time nopts, type trailer atom -
-d37a7eda807912b9ed05ccfe003a9e4f 4939 vfr-noduration
+5c873f6e37d5af09e3c6329cf94cd6ca 4939 vfr-noduration
 write_data len 1231, time nopts, type header atom ftyp
 write_data len 1500, time -333333, type sync atom moof
 write_data len 1500, time nopts, type unknown atom -