lavf/mov: Do not fail hard for more invalid atoms.

This is what several other players do and what FFmpeg already does for the sidx atom.

Fixes ticket #7679.

libavformat/mov.c

@@ -4550,17 +4550,17 @@ static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     track_id = avio_rb32(pb);
     if (!track_id)
         return AVERROR_INVALIDDATA;
-    frag->track_id = track_id;
-    set_frag_stream(&c->frag_index, track_id);
     for (i = 0; i < c->trex_count; i++)
-        if (c->trex_data[i].track_id == frag->track_id) {
+        if (c->trex_data[i].track_id == track_id) {
             trex = &c->trex_data[i];
             break;
         }
     if (!trex) {
-        av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
-        return AVERROR_INVALIDDATA;
+        av_log(c->fc, AV_LOG_WARNING, "could not find corresponding trex (id %u)\n", track_id);
+        return 0;
     }
+    frag->track_id = track_id;
+    set_frag_stream(&c->frag_index, track_id);
 
     frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?
                              avio_rb64(pb) : flags & MOV_TFHD_DEFAULT_BASE_IS_MOOF ?
@@ -4639,8 +4639,8 @@ static int mov_read_tfdt(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         }
     }
     if (!st) {
-        av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %u\n", frag->track_id);
-        return AVERROR_INVALIDDATA;
+        av_log(c->fc, AV_LOG_WARNING, "could not find corresponding track id %u\n", frag->track_id);
+        return 0;
     }
     sc = st->priv_data;
     if (sc->pseudo_stream_id + 1 != frag->stsd_id && sc->pseudo_stream_id != -1)
@@ -4686,8 +4686,8 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         }
     }
     if (!st) {
-        av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %u\n", frag->track_id);
-        return AVERROR_INVALIDDATA;
+        av_log(c->fc, AV_LOG_WARNING, "could not find corresponding track id %u\n", frag->track_id);
+        return 0;
     }
     sc = st->priv_data;
     if (sc->pseudo_stream_id+1 != frag->stsd_id && sc->pseudo_stream_id != -1)