ffmpeg
Universal media converter for audio/video transcoding, filtering, and format conversion.
$ ffmpeg -i input.avi -c:v libx264 -c:a aac output.mp4
Examples
# Convert to H.264 MP4 ffmpeg -i input.avi -c:v libx264 -c:a aac output.mp4 # Convert to H.265 ffmpeg -i input.mp4 -c:v libx265 -c:a copy output.mp4 # Convert to MP3 audio ffmpeg -i input.mp4 -vn -c:a mp3 output.mp3 # Convert with bitrate control ffmpeg -i input.avi -c:v libx264 -b:v 2M -c:a aac -b:a 192k output.mp4