Yes, Use the following command to convert the MKV file to MP4:
ffmpeg -i input.mkv output.mp4
Replace input.mkv with the name of your MKV file, and output.mp4 with the desired name for the output file.
Wait for the conversion process to complete. This may take a few minutes, depending on the size of the file and the speed of your computer.
Once the conversion is complete, you should find the output MP4 file in the same directory as the original MKV file.
Please refer this for more information: How do you keep multiple audio and subtitle streams while converting from MKV to MP4 using FFmpeg?