The file name ba3162e2sdede.mkv.mp4 suggests it may have been renamed incorrectly or is a remnant of a partial conversion.

: You can use a simple command-line tool like FFmpeg to convert or extract streams. A typical command for remuxing is: ffmpeg -i input.mkv -codec copy output.mp4

The gold standard for web, mobile, and hardware compatibility.

: Open the file in VLC Media Player and go to Tools > Codec Information to see if the container is truly MKV or MP4. 2. Converting or Remuxing