Use ffmpeg to do media manipulation from the terminal, like slowing down or speeding up a video, converting from MP4 to GIF, JPEG to PNG, etc. ## Versioning To see the currently installed version: ```bash ffmpeg -version # Note that it's just one dash ``` ## Usage ### Convert Video to Gif ```bash ffmpeg -i input.mov output.gif ``` Double the speed of the output media: ```bash ffmpeg -i input.mov -vf "setpts=0.5*PTS" -f output.gif ``` You may need to specify the `fps` to maintain speed in converting to a gif, especially when converting from `.mov` file exported from Photos app. 1. Find fps, or tbr (target bitrate) with `ffprobe filename.mov` 2. Set `fps={number}` in the `vf` option: ```bash ffmpeg -i input.mov -vf "setpts=0.5PTS,fps=30" output.gif ``` ### Remove audio from the output: ```bash ffmpge -i input.mov -an output.webm ``` ### Reduce fps Assuming fps is greater than 15 in `input.gif`: ```bash ffmpeg -i input.gif -vf "fps=15" output.gif ``` ### Get FPS from Gif ```bash ffprobe -v error -select_streams v:0 -show_entries stream=r_frame_rate -of default=noprint_wrappers=1:nokey=1 {input.gif} ``` Framerate will look like a fraction - e.g. 30/1 means 30 FPS. ## HEIC You may experience issues working with HEIC images. You can use different libraries like `heif-convert` if you can't get ffmpeg to work. Apparently, newer versions of ffmpeg come with HEIC support, though I haven't personally gotten it to work.