To ensure a video file is a "proper piece," follow these common standards:
: A "proper" piece is not corrupted. Corruption often happens if a recording or transfer is interrupted, or if a livestream download (using tools like yt-dlp ) is closed incorrectly, resulting in an unfinalized .part file. Creating a Proper Piece
: A "proper" piece must be correctly multiplexed , meaning the audio and video tracks are merged into a single file. If you see separate .m4v and .aac files after exporting from software like Adobe Premiere, the multiplexing failed.
Export Issue: Premiere Pro creates M4V and AAC instead of MP4
: For a video to be "proper" for web streaming (starting before the full download finishes), the moov atom (metadata) should be moved to the beginning of the file.