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FFMPEG-cheat-sheet.md

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FFMPEG Cheat Sheet

This file details a set of common things you may want to do with FFMPEG.

Create a video from a sequence of PNG images

The following command can be used to make a .mp4 video from a series of images padded with zeros (pic.00001.png, pic.0002.png, ...).

ffmpeg -r 30 -f image2 -i pic.%04d.png -vcodec libx264 -crf 25  -pix_fmt yuv420p test.mp4

The inputs are:

  • -r is the framerate
  • -crf is the quality, lower means better quality
  • -S (optional) video resolution in pixes
  • -pix_fmt specifies the pixel format

Playing one video after another

The following command can be used to play a sequence of videos with the same width and height.

ffmpeg -f concat -i videos.txt -c copy joinedVideo.mp4

The file videos.txt contains an ordered list of videos with the following syntax:

file '/directory/Video1.mp4'
file '/directory/Video2.mp4'

Stacking videos

The following command can be used to vertically stack two videos with the same width.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex vstack out.mp4

The following command can be used to horizontally stack two videos with the same height.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex hstack out.mp4

N videos can be stacked using the following.

ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4 -filter_complex hstack=N out.mp4

A 2x2 array of compatible videos can be created using

ffmpeg -i input0 -i input1 -i input2 -i input3 -filter_complex "[0:v][1:v][2:v][3:v]xstack=inputs=4:layout=0_0|w0_0|0_h0|w0_h0[v]" -map "[v]" output.mp4

Dealing with an odd number of pixels

Adding -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" to your FFMPEG command as shown below allows you to create a video from PNGs that are not an even number of pixels in height and/or width.

ffmpeg -r 30 -f image2 -i pic.%04d.png -vcodec libx264 -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -crf 25  -pix_fmt yuv420p test.mp4

Adding an .mp3 to a video

The following command can be used to add sound to video.

ffmpeg -r 30 -f image2 -i pic.%04d.png -i MP3FILE.mp3 -vcodec libx264 -b 4M -vpre normal -acodec copy test.mp4

The inputs are:

  • -i MP3FILE.mp3 is the name of the audio file
  • -acodec copy copies the audio from the input to the output stream

Converting a video to .mp4

The following command can be used to convert a video to .mp4.

ffmpeg  -i INPUT.avi -vcodec libx264 -crf 25 OUTPUT.mp4

Cropping a video

The following command can be used to crop a video

ffmpeg -i input.mp4 -vf "crop=w:h:x:y" output.mp4

where the inputs are

  • -vf indicates the usage of a video filter
  • crop is the name of the filter
  • w:h is the width and height of the output video<
  • x:y is the coordinate from which the video will be