ffmpeg -i “input.mkv” -attach “cover.jpg” -map 0 -c copy - metadata:s:t mimetype=“image/jpg” -metadata:s:t:0 filename=“cover.jpg” “output_cover.mkv”

ffmpeg -i input.mkv -c copy -attach image.jpg -metadata:s:t \
mimetype=image/jpeg output.mkv

ffmpeg -i "input_file.mp4" -i "Input_file.jpg" -map 1 -map 0  -acodec copy -vcodec copy "output_file.mp4"

ffmpeg -i "input_file.mp4" -i "Input_file.jpg" -map 1 -map 0  -acodec copy -vcodec copy "output_file.mp4"

ffmpeg -i “JoseVega.RATWM.mkv” -attach “JoseVega.RATWM.jpg” -map 0 -c copy - metadata:s:t mimetype=“image/jpg” -metadata:s:t:0 filename=“JoseVega.RATWM.jpg” “JoseVega.RATWM.plus.cover.mkv”

ffmpeg -i JoseVega.RATWM.mkv -c copy -attach JoseVega.RATWM.jpeg -metadata:s:t \

mimetype=image/jpeg JoseVega.RATWM.plus.cover.mkv

fmpeg -i "JoseVega.RATWM.mp4" -i "JoseVega.RATWM.jpeg" -map 1 -map 0 -acodec copy -vcodec copy "JoseVega.RATWM.plus.cover.mp4"