ffmpeg -i input_file.adr -c:v libx264 -crf 18 -s 640x480 -r 30 output.mp4
This is the most common suggestion. You play the recording in the AnyDesk client and use OBS Studio or the Windows Game Bar (Win+G) to capture the playback in real-time as an MP4. Convert Anydesk Video To Mp4 -UPD-
Online-Convert : A browser-based alternative for quick, one-off file conversions. ffmpeg -i input_file
Some users report success uploading .anydesk files directly to Flixier to convert them to MP4. Convert Anydesk Video To Mp4 -UPD-