: The allmp4 portion suggests the script scans a directory for every file with an .mp4 extension.
: If the input MP4s have different settings (e.g., one is 1080p and another is 720p), the "copy" command will fail or produce a corrupted video. In these cases, the script must re-encode the videos to a unified format. merge_allmp4_at_pe_mp4
A report on such a tool typically covers how it handles the merging process: : The allmp4 portion suggests the script scans