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ffmepg is a integrated tool for video encoding/decoding processing as open source project - http://ffmpeg.org


Typical syntax of ffmpeg command is like below:

ffmpeg [global_options] {[input_file_options] -i input_url} ... {[output_file_options] output_url} ...


1. Get Video Information

$ ffmpeg -i video.mp4


2. Get Video Information without bannder

$ ffmpeg -i video.mp4 -hide_banner


3. Converting video to mp4

$ ffmpeg -i video.avi video.mp4


4. Converting video to mkv

$ ffmpeg -i video.avi video.mkv


5. Converting video to mp4 without any quality loss

$ ffmpeg -i input.webm -qscale 0 output.mp4


6. Displaying the supported formats by ffmpeg

$ ffmpeg -formats


7. Converting video files to audio files

$ ffmpeg -i input.mp4 -vn -ab 320 output.mp3


8. Change resolution of video files

$ ffmpeg -i input.mp4 -filter:v scale=1280:720 -c:a copy output.mp4

or

$ ffmpeg -i input.mp4 -s 1280x720 -c:a copy output.mp4


9. Compressing video files

$ ffmpeg -i input.mp4 -vf scale=1280:-1 -c:v libx264 -preset veryslow -crf 24 output.mp4

Note crf value 24 is too aggressive, you'd better lower its value, 


10. Compressing audio files

$ ffmpeg -i input.mp3 -ab 128 output.mp3


11. Extracting images from video

$ ffmpeg -i input.mp4 -r 1 -f image2 image-%2d.png
  • -r – Set the frame rate. I.e the number of frames to be extracted into images per second. The default value is 25.
  • -f – Indicates the output format i.e image format in our case.
  • image-%2d.png – Indicates how we want to name the extracted images. In this case, the names should start like image-01.png, image-02.png, image-03.png and so on. If you use %3d, then the name of images will start like image-001.png, image-002.png and so on.


12. Split video files into multiple parts

$ ffmpeg -i input.mp4 -t 00:00:30 -c copy part1.mp4 -ss 00:00:30 -codec copy part2.mp4


13. Joining multiple video parts into one

$ ffmpeg -f concat -i join.txt -c copy output.mp4

For your information, join.txt contains following video files

C:\Users\LifePlanet\Downloads\part1.mp4
C:\Users\LifePlanet\Downloads\part2.mp4
C:\Users\LifePlanet\Downloads\part3.mp4
C:\Users\LifePlanet\Downloads\part4.mp4


14. Adding subtitles to a video file

$ fmpeg -i input.mp4 -i subtitle.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast output.mp4



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