How to keep the cover art of a video file when converting with ffmpeg?

Question

fmpeg

Essence of the question: It is necessary to convert the video file from .mkv to .mp4 for integration into the Apple environment. The .mkv container contains, among other things, the cover of the movie. I convert with this command: ffmpeg -y -i INPUTFILE.mkv -vcodec libx264 -preset slow -profile:v baseline -level 30 -maxrate 10000000 -bufsize 10000000 -b 1200k -f mp4 -map 0:0 -acodec aac -ac 6 - ab 640k -strict experimental -c:t copy -threads 0 -map 0:1 -map 0:3 -map 0:7 OUTPUTFILE.mp4 Everything is perfectly converted and there is a stream (-map 0:7) with a cover in the ffprobe output. But the cover itself is not displayed in iTunes or Explorer . Help solve the problem.