: 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.
: 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
A "proper" MP4 file is more than just a file with a .mp4 extension; it must follow specific structural and encoding standards to ensure it plays correctly across different devices and platforms. Corruption often happens if a recording or transfer
Export Issue: Premiere Pro creates M4V and AAC instead of MP4 : A "proper" piece must be correctly multiplexed