metadata_header_size  706 libavformat/wtvenc.c         pos += metadata_header_size(tag->key) + strlen(tag->value)*2 + 2;
metadata_header_size  712 libavformat/wtvenc.c         pos += metadata_header_size("WM/Picture") + attachment_value_size(&wctx->thumbnail, av_dict_get(st->metadata, "title", NULL, 0));
metadata_header_size  715 libavformat/wtvenc.c         pos += metadata_header_size("WM/MediaThumbType") + 4;