Small Tools [2]: ffmpeg -- Video conversion tool.

yffmpeg

1.Install （安装）

• macOS (wait a min)

  brew install ffmpeg

2.Usage （用法）

• General usage

ffmpeg -i video.mp4 -vn sound.mp3

• More usage

  ffmpeg
  
  Video conversion tool.
  
  - Extract the sound from a video and save it as MP3:
      ffmpeg -i video.mp4 -vn sound.mp3
  
  - Convert frames from a video or GIF into individual numbered images:
      ffmpeg -i video.mpg|video.gif frame_%d.png
  
  - Combine numbered images (frame_1.jpg, frame_2.jpg, etc) into a video or GIF:
      ffmpeg -i frame_%d.jpg -f image2 video.mpg|video.gif
  
  - Quickly extract a single frame from a video at time mm:ss and save it as a 128x128 resolution image:
      ffmpeg -ss mm:ss -i video.mp4 -frames 1 -s 128x128 -f image2 image.png
  
  - Trim a video from a given start time mm:ss to an end time mm2:ss2 (omit the -to flag to trim till the end):
      ffmpeg -ss mm:ss -to mm2:ss2 -i video.mp4 -codec copy output.mp4

More Ref:- https://ffmpeg.org (官网)

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