For input streams this option only makes sense for audio grabbing devices and raw demuxers and is mapped to the corresponding demuxer options. For output streams it is set by default to the number of input audio channels.

-ac: Set the number of audio channels.

For output streams it is set by default to the frequency of the corresponding input stream.

-ar: Set the audio sampling frequency.

-vn: Disable video, to make sure no video (including album cover image) is included if the source would be a video file.

This command saves image frame after every 4 seconds.įfmpeg -i input.wav -vn -ar 44100 -ac 2 -b:a 320k output.mp3

You can use FFmpeg to automatically extract image frames from a video every n seconds and the images are saved in a sequence.

So a value of 10 will cause the GIF to play 11 times. A value of 0 is infinite looping, -1 is no looping, and 1 will loop once meaning it will play twice. Control looping with -loop output option but the values are confusing.Split filter will allow everything to be done in one command and avoids having to create a temporary PNG file of the palette.Also see the Advanced options section below. These filters have many options, so refer to the links for a list of all available options and values. Palettegen and paletteuse filters will generate and use a custom palette generated from your input.The lanczos scaling algorithm is used in this example. Scale filter will resize the output to 320 pixels wide and automatically determine the height while preserving the aspect ratio.A rate of 10 frames per second is used in the example. This example will skip the first 30 seconds (-ss 30) of the input and create a 3 second output (-t 3).Convert video from one format to anotherįfmpeg -ss 30 -t 3 -i input.mp4 -vf 'fps=10,scale=480:-1:flags=lanczos,split palettegen paletteuse' -loop 0 output.gif.

Google ffmpeg tutorial