[wp-trac] [WordPress Trac] #65297: HEIC/HEIF MIME Type Mapping Is Inaccurate

[WordPress Trac]

#65297: HEIC/HEIF MIME Type Mapping Is Inaccurate
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 Reporter:  modi2918                    |       Owner:  adamsilverstein
     Type:  defect (bug)                |      Status:  reviewing
 Priority:  normal                      |   Milestone:  Awaiting Review
Component:  Media                       |     Version:  6.7
 Severity:  normal                      |  Resolution:
 Keywords:  has-patch needs-unit-tests  |     Focuses:
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Comment (by modi2918):

 ### Where These File Types Come From in Everyday Use

 **test-heic.heic — Photos from iPhones**

 This is by far the most common HEIC file users upload. Apple introduced
 HEIC as the default photo format with iOS 11, and every iPhone since the
 iPhone 7 captures photos in this format unless the user changes the camera
 settings. A typical scenario is someone taking a photo on their iPhone,
 transferring it to a Mac, and then uploading it to a website or WordPress.
 These files usually use the **heic** major brand.

 **test-heif.heif — Photos from Android Devices**

 Many Android phones, including Samsung Galaxy and Google Pixel devices,
 support the HEIF format. Unlike Apple, Android devices generally use the
 **mif1** major brand, which follows the MPEG HEIF specification. Files
 exported through Samsung Gallery, Google Photos, or other HEIF-compatible
 applications commonly use this format. This distinction is important
 because a file may have a `.heif` extension while still using the **mif1**
 brand rather than **heif**, causing some file detection methods to miss it
 and rely on fallback detection mechanisms.

 **test-heics.heics — Apple Live Photos**

 Apple Live Photos combine a still image with a short motion clip. When
 exported, they can be stored as HEVC image sequences using the **hevc**
 major brand and typically carry the `.heics` extension. While less common
 than standard HEIC photos, users who back up or export their iPhone photo
 libraries may encounter these files.

 **test-heifs.heifs — Burst Photos and Image Sequences**

 Some Android devices and image-processing tools generate HEIF image
 sequences rather than single images. For example, burst-mode photos may be
 packaged using the **msf1** major brand and saved with a `.heifs`
 extension. These files can also be produced by professional imaging
 software and tools that support the HEIF format, such as applications
 built on libheif.

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Ticket URL: <https://core.trac.wordpress.org/ticket/65297#comment:8>
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