Lastly, browsers and image viewers may implement a minimum delay, so your -delay may get ignored anyway. delay appears to be ignored if used as an output option, so it has to be used before - as shown in the example. This effectively means that only some frame rates are supported when setting a uniform delay over all frames (a specific delay can be set per frame but that is beyond this answer). For example, with fps=12.5 = 100/12.5 = 8 = -delay 8.Ĭonvert rounds the -delay value to a whole number, so 8.4 results in 8 and 8.5 results in 9. Secondly, the -delay value in convert is in ticks (there are 100 ticks per second), not in frames per second.
This can get complicated because convert just gets a raw stream of images so no fps is preserved. Set frame rate with a combination of the fps filter in ffmpeg and -delay in convert. It is not guaranteed that it will produce a smaller output, so it is worth trying without -layers optimize and comparing results. See ImageMagick Animation Optimization for more details. layers optimize Will enable the general purpose GIF optimizer. delay See Setting frame rate section below. f image2pipe chooses the image2pipe muxer because when outputting to a pipe ffmpeg needs to be told which muxer to use. The example outputs the PAM (Portable AnyMap) image format which is a simple, lossless RGB format that supports transparency (alpha) and is supported by convert. The lanczos scaling algorithm is used in this example. fps sets frame rate to 10, and scale sets the size to 320 pixels wide and height is automatically determined and uses a value that preserves the aspect ratio. vf "fps=10,scale=320:-1:flags=lanczos" a filtergraph using the fps and scale filters. ffmpeg -i input.mp4 -vf "fps=10,scale=320:-1:flags=lanczos" -c:v pam \Ĭonvert -delay 10 -loop 0 -layers optimize output.gif See High quality GIF with FFmpeg for explanations, example images, and more detailed info for advanced usage.Īlso see the palettegen and paletteuse documentation for all available options and values.Īnother command-line method is to pipe from ffmpeg to convert (or magick) from ImageMagick. If you want to try bayer be sure to test the bayer_scale option too. Your GIF may look better using a particular dithering algorithm, or no dithering at all. There are three main types: deterministic ( bayer), error diffusion (all the others including the default sierra2_4a), and none. For example, to generate a palette for each individual frame use palettegen=stats_mode=single & paletteuse=new=1.ĭither (paletteuse).
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You can force the filters to focus the palette on the general picture ( full which is the default), only the moving parts ( diff), or each individual frame ( single). The palettegen and paletteuse filters have many additional options. 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.
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Before you start it is always recommended to use a recent version: download or compile.
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