: Import your video, click "Profile," choose the MKV format, and select the 480p resolution.
: Some devices (like Chromecast) might not support the specific internal codec of an MKV. In these cases, using a media server like Plex or Jellyfin can automatically "transcode" the file so it plays smoothly. MKPlayer - MKV & Media Player - App Store - Apple Download MTF480 mkv
: For a fast conversion without quality loss (if only changing the container), you can use the command line: ffmpeg -i input_file.mp4 -c copy output_file.mkv . Troubleshooting Playback : Import your video, click "Profile," choose the