Try something like: ffmpeg -i in.mp4 -c:v h264 -c:a aac out.mp4
To re-encode the content into H.264+AAC, rather than simply "muxing" the encoded bitstreams from the MP4 container into a new MOV container.
To re-encode the content into H.264+AAC, rather than simply "muxing" the encoded bitstreams from the MP4 container into a new MOV container.
-c:v libx264 -pix_fmt yuv420p -preset medium -crf 18 \
-c:a aac -b:a 192k \