Alternatively, if the error is a conversion cutoff, you may need to split the video.

Since you requested a long article for this keyword, I will assume you need a

Before converting, you must understand the source. is a unique identifier (JAV code). Files bearing this code often come with .engsub in the title, meaning the video contains English subtitles either as a separate track (softsubs) or burned into the video (hardsubs).

It looks like you're referring to a specific file naming convention—likely a video file (e.g., pppd896engsub refers to a JAV title with English subtitles) and a timestamp ( convert015838 min may refer to 1 hour, 58 minutes, 38 seconds, possibly for a conversion or clip).