demux_lavf: select non-empty edition by default

Some files, that are stripped from programs without edition program
table expose all old programs, that are not usable. Try to select the
one that actually has tracks.

Fixes: https://github.com/mpv-player/mpv/issues/18053#issuecomment-4607524402

demux/demux_lavf.c

@@ -1015,6 +1015,7 @@ static void build_editions(demuxer_t *demuxer)
         return;
     }
 
+    int first_nonempty = -1;
     for (unsigned i = 0; i < avfc->nb_programs; i++) {
         AVProgram *prog = avfc->programs[i];
 
@@ -1024,12 +1025,13 @@ static void build_editions(demuxer_t *demuxer)
         };
         mp_tags_copy_from_av_dictionary(ed.metadata, prog->metadata);
 
-        int video_count = 0, audio_count = 0;
+        int video_count = 0, audio_count = 0, track_count = 0;
         int video_idx = -1, audio_idx = -1;
         for (unsigned j = 0; j < prog->nb_stream_indexes; j++) {
             unsigned idx = prog->stream_index[j];
             if (idx >= priv->num_streams || !priv->streams[idx]->sh)
                 continue;
+            track_count++;
             struct sh_stream *sh = priv->streams[idx]->sh;
             if (sh->type == STREAM_VIDEO) {
                 video_count++;
@@ -1066,6 +1068,9 @@ static void build_editions(demuxer_t *demuxer)
         if (title)
             mp_tags_set_str(ed.metadata, "title", title);
 
+        if (track_count > 0 && first_nonempty < 0)
+            first_nonempty = demuxer->num_editions;
+
         MP_TARRAY_APPEND(demuxer, demuxer->editions, demuxer->num_editions, ed);
     }
 
@@ -1115,7 +1120,7 @@ static void build_editions(demuxer_t *demuxer)
             selected = best;
     }
 
-    demuxer->edition = selected >= 0 ? selected : 0;
+    demuxer->edition = selected >= 0 ? selected : first_nonempty >= 0 ? first_nonempty : 0;
 }
 
 #if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(60, 19, 100)