If you need to play the file on an older TV or device that doesn't support HEVC, you can "transcode" it to H.264.
If the file won't open, your device likely lacks the specific . MKV_BACKUP_1 HEVC 1080p.mkv
: Best for converting MKV/HEVC to a more compatible format like MP4 (H.264). If you need to play the file on