command: add track-list/N/demux-duration property

DOCS/interface-changes/stats-page-5.txt

@@ -1 +1,2 @@
 add `track_info_selected_only` script option for stats
+add `track-list/N/demux-duration` property

DOCS/man/input.rst

@@ -3516,6 +3516,9 @@ Property list
     ``track-list/N/demux-par``
         Pixel aspect ratio.
 
+    ``track-list/N/demux-duration``
+        Track duration as indicated by the container.
+
     ``track-list/N/format-name``
         Short name for format from ffmpeg. If the track is audio, this will be
         the name of the sample format. If the track is video, this will be the

demux/demux_lavf.c

@@ -827,6 +827,7 @@ static void handle_new_stream(demuxer_t *demuxer, int i)
             avcodec_parameters_copy(sh->codec->lav_codecpar, codec);
         sh->codec->native_tb_num = st->time_base.num;
         sh->codec->native_tb_den = st->time_base.den;
+        sh->codec->duration = st->duration * av_q2d(st->time_base);
 
         if (st->disposition & AV_DISPOSITION_DEFAULT)
             sh->default_track = true;

demux/stheader.h

@@ -137,6 +137,9 @@ struct mp_codec_params {
     // STREAM_SUB
     double frame_based;   // timestamps are frame-based (and this is the
                           // fallback framerate used for timestamps)
+
+    // STREAM_VIDEO + STREAM_AUDIO + STREAM_SUB
+    double duration;
 };
 
 #endif /* MPLAYER_STHEADER_H */

player/command.c

@@ -2092,6 +2092,7 @@ static int get_track_entry(int item, int action, void *arg, void *ctx)
         {"demux-bitrate",  SUB_PROP_INT(p.bitrate), .unavailable = p.bitrate <= 0},
         {"demux-rotation", SUB_PROP_INT(p.rotate),  .unavailable = p.rotate <= 0},
         {"demux-par",      SUB_PROP_DOUBLE(par),    .unavailable = par <= 0},
+        {"demux-duration", SUB_PROP_PTS(p.duration), .unavailable = p.duration <= 0},
         {"format-name", SUB_PROP_STR(p.format_name), .unavailable = !p.format_name},
         {"replaygain-track-peak", SUB_PROP_FLOAT(rg.track_peak),
                         .unavailable = !has_rg},