ffmpeg将AVI转换为MP4

ffmpeg -i movie.avi -c copy -map 0 output.mp4或
ffmpeg -i movie.avi -c:v libx264 -crf 19 -preset slow -c:a aac -b:a 192k -ac 2 out.mp4

Refer to:Convert AVI (Xvid) to MP4 (H.264) keeping the same quality
Encode with ffmpeg using avi to mp4