ffmpeg转换视频 格式

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

ffmpeg -i mov.mov -max_muxing_queue_size 1024 -crf 26 -c:v libx264 -preset placebo -c:a aac -ac 2 -vsync 0 -y out.mp4
ffmpeg -i mov.mov -max_muxing_queue_size 1024 -crf 26 -c:v libx264 -preset placebo -c:a aac -ac 2 -b:a 64k -vsync 0 -y out.mp4

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