FFmpeg is a command-line tool used for recording, converting, and streaming audio and video.
brew install ffmpegsudo apt-get install ffmpegffmpeg -i input.mp4 output.avi
Converts input.mp4 to output.avi.
-i: Specifies the input file.-f: Specifies the output format.-c: Specifies the codec to use for the output.-s: Specifies the frame size for the output.-b: Specifies the bitrate for the output.-ar: Specifies the audio sample rate for the output.-ac: Specifies the number of audio channels for the output.-vf: Applies a video filter to the output.-af: Applies an audio filter to the output.ffmpeg -i input.mp4 -c:v libx264 -c:a copy output.mp4 # Convert to MP4 using H.264 video codec
ffmpeg -i input.mp4 -vf "scale=720:-1" output.mp4 # Resize video to 720p height
ffmpeg -i input.mp4 -af "volume=2" output.mp4 # Increase audio volume by 2x
ffmpeg -f avfoundation -i "default" output.mp4 # Record video from webcam on macOS
ffmpeg -i input.mp4 -f mpegts udp://127.0.0.1:1234 # Stream video over UDP