mxfdec: skip to end of structural sets This fixes reading of partition packs....

mxfdec: skip to end of structural sets This fixes reading of partition packs. The code stops reading after the operational pattern and should skip the array of essence container labels that follow

libavformat/mxfdec.c

@@ -1039,8 +1039,11 @@ static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
                 int res;
                 if (klv.key[5] == 0x53) {
                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);
-                } else
+                } else {
+                    uint64_t next = avio_tell(s->pb) + klv.length;
                     res = metadata->read(mxf, s->pb, 0, 0, klv.key);
+                    avio_seek(s->pb, next, SEEK_SET);
+                }
                 if (res < 0) {
                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
                     return -1;