Ensure the file ends in .mp4 , .mkv , or .avi . If the "convert" part of the name is actually part of the extension, the file may be incomplete.

ffmpeg -i kop58.mkv -map 0:s:0 -ss 01:40:51 -c copy shifted_subs.ass

: Many independent subbing groups use these platforms to host "conversions" of episodes, often broken into parts. to see if it matches your interests?

While it looks like gibberish, kop58engsub convert014051 min is simply a data-rich filename indicating a 140-minute English-subtitled video. Whether you're a collector or a casual viewer, knowing how to read these "digital fingerprints" makes navigating the web much easier.

This is typically a series code or a group identifier. In many circles, "KOP" refers to specific Thai Lakorns or "King of Pop" related archives. The "58" often refers to a specific episode number or a release year.

: In other contexts, "sub 1:40" is a standard target for intermediate runners aiming to complete a half marathon in under 1 hour and 40 minutes. Frontu - Field Worker - Apps on Google Play

The phrase "kop58engsub convert014051 min" appears to be a specific technical filename or a metadata string often associated with video files—specifically English-subtitled dramas or films