The Matroska (MKV) format is a flexible container that supports multiple audio tracks and subtitle streams, making it a preferred choice for archival and high-quality playback .

If you are still watching the old 720p AVI files or the original DVD, here is why you need to upgrade to the version:

Title: Final Fantasy VII: Advent Children Complete Source: Blu-ray 1080p (BD9) Container: MKV Resolution: 1920×1080 (Full HD) Video codec: H.264 / AVC (likely High Profile) Bitrate: ~20–30 Mbps (typical for BD9 remuxes; may vary) Frame rate: 23.976 fps (film) Audio tracks: