Overview: File packaging details

Media packaging details shape how a container stores, exposes or references the content needed for playback.

Two files using the same general format can be arranged differently. Metadata placement, fragmentation, attachments or disc structures can change how a reader starts, navigates or obtains the media. These topics explain those packaging choices rather than assuming that the extension captures the whole playback arrangement.

• MP4 packaging
  MP4 packaging choices affect media segmentation, startup access and the conventions used for audio-only files.

• Matroska features
  Matroska attachments and ordered chapters add supporting assets and navigation relationships beyond ordinary media tracks.

• MP3 files and MPEG audio frames
  An MP3 file stores MPEG Layer III audio frames together with optional tags and information for duration and seeking.

• AAC transport formats
  AAC transport formats frame and describe coded audio for the container or delivery system carrying it.

• Disc structures and images
  Disc structures and images preserve media files together with the organization used by a disc-based playback system.