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Create GIF
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Part 1: Create 3 second clip from an existing source file (no audio necessary)
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+ ffmpeg -ss HH:MM:SS -i input.mov -c:v copy -c:a copy -t 3 output.mov
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+ - ffmpeg : starts the command
+ - -ss HH:MM:SS: The starting point of the gift
+ - -t 3: the number of seconds after the starting point repeated in the gif
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Part 2: Make the gif
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+ ffmpeg -i input.mov -vf scale=500:-1 -t 10 -r 30 output.gif
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+ - ffmpeg : starts the command
+ - -vf scale: width:height in pixels (a negative number keeps it in proportion)
+ - -t 10: Maximum length of running time
+ - -r 30: run at 30 frames per second
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