Few FFmpeg commands that you can play with

• concat video of different framerates in .mkv format:
  • -i input1.mp4 -i input2.mp4 -filter_complex [0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1[outv][outa] -map [outv] -map [outa] output.mkv
• concat video with no sound/audio:
  • -y -i input.mp4 -filter_complex [0:v]trim=0:0,setpts=PTS-STARTPTS[v1];[0:v]trim=0:5,setpts=0.5*(PTS-STARTPTS)[v2];[0:v]trim=5,setpts=PTS-STARTPTS[v3];[v1][v2][v3]concat=n=3:v=1:a=0 -b:v 2097k -vcodec mpeg4 -crf 0 -preset superfast output.mp4
• Textoverlay:
  • -y -i input.mp4 -vf drawtext=”fontsize=30:fontfile=cute.ttf:text=’GFG'”:x=w-tw-10:y=h-th-10 -c:v libx264 -preset ultrafast outputmp4
• gif/png/jpeg overlay
  • -i input.mp4 -i inputimage.png -filter_complex [1:v]scale=320:394[ovr1],[0:v][ovr1]overlay=0:0:enable=’between(t,0,16)’ -c:a copy output.mp4, (or)
  • -i input.mp4 -i inputimage.png -filter_complex overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable=’between(t,0,7)’ -c:a copy output.mp4
• Add subtitles to a video file
  • -i input.mp4 -i subtitle.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset superfast output.mp4
• Converting video files to audio files
  • -i input.mp4 -vn output.mp3
• Cropping videos
  • -i input.mp4 -filter:v “crop=w:h:x:y” output.mp4
    • w – width of the rectangle which we are intended to crop from the source video.
    • h – the height of that rectangle.
    • x – the x coordinate of that rectangle.
    • y – the y coordinate of the rectangle.
• Adding a poster image to audio files
  • -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4

FFmpeg, short for Fast-forward MPEG, is a free and open-source multimedia framework, which is able to decode, encode, transcode, mux, demux, stream, filter and play fairly all kinds of multimedia files that have been created to date. It also supports some of the eldest formats. FFmpeg compiles and runs, across various operating systems like Linux, Mac OS X, Microsoft Windows, the BSDs, Solaris, etc. among a large range of build environments, machine architectures, and configurations. Programming languages used in FFmpeg are C and Assembly language. We can do many fun kinds of stuff using Ffmpeg like, Video Compress, Audio Compress, Trim Video, Rotate Video, Crop Video, Adding filters to videos, Reverse a Video, Creating fast and slow-motion video, Fade in fade out, Merge audio and video, Creating a video from images, Convert video from one format into another, Extract Picture from Video or Sound from Video, Gifs overlay, and many more. FFmpeg is part of the workflow of hundreds of other media-related software projects, and it’s often used behind the scenes. Also, It is an internal part of software such as VLC media player, YouTube, Plex, iTunes, Shortcut, Blender, Kodi, HandBrake, it handles video and audio playback in Google Chrome, and Linux version of Firefox. FFmpeg comprises an enormous set-up of libraries and projects for dealing with video, sound, and other multimedia files and streams.