Attached fonts are incorrectly identified as "Cover" in MKV files

[Bokk0]

MediaInfoLib/Source/MediaInfo/File__Analyze_Streams.cpp

Line 529 in b1c5fb1

if (Description_Lower.find(__T("thumbnail")) != string::npos && Description_Lower.find(__T("c2pa.thumbnail")) == string::npos) {

MediaInfoLib/Source/MediaInfo/File__Analyze_Streams.cpp

Line 533 in b1c5fb1

if (Description_Lower.find(__T("cover")) != string::npos || Description_Lower.find(__T("front")) != string::npos) {

Hi, I encountered an issue where MediaInfo identifies fonts (and other attachments) as covers when analyzing an MKV file.

Using mkvtoolnix, I create a new MKV file and add "FinalFrontier (Regular).TTF" and "v_CCDearDiary_v1.3.TTF" to the attachments (The first one has "front" in its name, the second one has "cd"). mkvtoolnix sets the MIME type flag to "application/x-truetype-font". As a result, I get an .mkv file.

If you open the file in a text editor, there will be strings starting like this:

ып vГА s¤ђтВx/0�Эм�9[)x�й!�A¤i �Нa§ LdFn›FinalFrontier (Regular).TTFF`›application/x-truetype-fontF\ 

F®€&*ќп‹�•Тa§ L_Fn–v_CCDearDiary_v1.3.TTFF`›application/x-truetype-fontF\

I dare to assume that "application/x-truetype-font" in both of these strings indicates that these are TrueType fonts in this MKV file.

Next, I open MediaInfo GUI and load the same file. There I can read that my fonts are... covers?..

It is likely that the same thing will happen with any other files (.txt (text/plain) and others) that contain certain combinations of letters in their names.

General
Unique ID                                : 322682918198261981159589721070056237345 (0xF2C2782F3014DDEC19395B29787FE921)
Complete name                            : D:\Desktop\123.mkv
Format                                   : Matroska
Format version                           : Version 1
File size                                : 42.4 KiB
Encoded date                             : 2026-01-30 18:13:52 UTC
Writing application                      : mkvmerge v97.0 ('You Don't Have A Clue') 64-bit
Writing library                          : libebml v1.4.5 + libmatroska v1.7.1
Cover                                    : Yes / Yes
Cover description                        : FinalFrontier (Regular).TTF / v_CCDearDiary_v1.3.TTF
Cover type                               : Cover / Cover (media)
Attachments                              : FinalFrontier (Regular).TTF / v_CCDearDiary_v1.3.TTF

Image #1
Type                                     : Cover
Title                                    : FinalFrontier (Regular).TTF
Muxing mode                              : Attachment
Stream size                              : 19.0 KiB (45%)

Image #2
Type                                     : Cover (media)
Title                                    : v_CCDearDiary_v1.3.TTF
Muxing mode                              : Attachment
Stream size                              : 19.0 KiB (45%)

[cjee21]

Maybe better to check something like:

Description_Lower.find(__T("cover.")) == 0

[JeromeMartinez]

A sample file please.

[Bokk0]

A sample file please.

mediainfo_covers.zip
a zipped mkv