"P01" is frequently used for Promotional Videos (PVs) or Pilot Episodes of upcoming series.
MKV files are preferred for international content because they allow "soft" subtitles (which can be toggled on or off) rather than "hardcoded" text that is permanently burned into the video. Recommended Playback Software takk-p01-480p-mkv
The industry standard for cross-platform playback that handles almost any MKV file without external codec packs. "P01" is frequently used for Promotional Videos (PVs)
: The Matroska Multimedia Container format, which supports multiple audio tracks and subtitle streams. takk-p01-480p-mkv
A lightweight alternative popular in the anime community for its precise subtitle rendering.