Then with the use of seeking, -ss, the section to be repeated can be specified.Ĭhallenge: Try looping a specific section of a video using concat.īelow is the command to identify the frame rate of an input file, this one has a frame rate of 29.97: $ ffmpeg -i input.mp4įfmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developersīuilt with Apple clang version 11.0.0 (clang-1100.0.33.17) Using concat multiple times on the same file could be used instead: $ ffmpeg -i input.mp4 -i input.mp4 -i input.mp4 -filter_complex "concat=n=3:v=1:a=1 " -map "" -map "" output.mp4 The loop filter works great with video but does not apply to audio output.
Indicates first or starting frame of the loop (default is 0) Indicates the number of frames (from 0 to value) that are repeated Indicates the number of loops (default is 0 with -1 being infinite) So from frames 0 to 1500 the loop will play 10 times after the 1500th frame has been played.
size is the number of frames that are repeated. In addition to the start parameter, a size parameter must be set as well. 30 FPS * 1 minute (60 seconds) = 1500 frames. In this example, input.mp4 has a 30 frames per second framerate (FPS). To calculate the frame value one must know the framerate of the input.
This is because start requires a frame value not time. In the requirements for this example, it was stated after the 1 minute mark the video will loop yet the start number is 1500. $ ffmpeg -i input.mp4 -filter_complex "loop=loop=10:size=1500:start=1500" -pix_fmt yuv420p output.mp4 In this example the input.mp4 is a 5 minute long video with the requirement that after the 1 minute mark, the video will loop 10 times. Looping a section of a video can be useful for presentations or advanced video editing.
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