[Tips] MOV 轉 MP4 並且縮小檔案

# 這應該最好用吧
avconv -i input.mov -s 1920x1080 -strict -2 output.mp4

ffmpeg -i input.mov -vcodec copy -acodec copy input.mp4
ffmpeg -i input.mp4 -vf "scale=iw/2:ih/2" -strict -2 half_the_frame_size.mp4  

* https://www.youtube.com/watch?v=8GNlfK8G_AI
* https://stackoverflow.com/questions/12026381/ffmpeg-converting-mov-files-to-mp4
* https://unix.stackexchange.com/questions/28803/how-can-i-reduce-a-videos-size-with-ffmpeg