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For details, see ffmpeg's x264 Encoding Guide for video and AAC Encoding Guide for audio.Īlso, the -t option specifies a duration, not an end time. When re-encoding you may also wish to include additional quality-related options or a particular AAC encoder. Re-encoding is the default if you do not specify copy. If you want to cut precisely starting at a non-keyframe and want it to play starting at the desired point on a player that does not support edit lists, or want to ensure that the cut portion is not actually in the output file (for example if it contains confidential information), then you can do that by re-encoding so that there will be a keyframe precisely at the desired start time. Some players will ignore the edit list and always play all of the media in the file from beginning to end. If this is not working for you then you are probably either using an older version of ffmpeg, or your player does not support edit lists. If you are using the latest ffmpeg from git master it will do this using an edit list when invoked using the command that you provided. In other words, if the closest keyframe before 3s is at 0s then it will copy the video starting at 0s and use an edit list to tell the player to start playing 3 seconds in.
#VIDEO CUTTER ONLINE .MOV MP4#
With the mp4 container it is possible to cut at a non-keyframe without re-encoding using an edit list. Because non-keyframes encode differences from other frames, they require all of the data starting with the previous keyframe. This will extract 1min5sec (using the -t flag) starting from 1min10sec (the -ss flag) in the file.You probably do not have a keyframe at the 3 second mark. You may instead want to specify a fixed duration to extract, in which case you can use: ffmpeg -i input.mp4 -ss 00:01:10 -t 00:01:05 -c:v copy -c:a copy output.mp4 This means that the above command only takes a few seconds to run. The copy parts of the command are meant to copy both the original audio and video content without recompressing. This will cut out the section from about 1h19min (after the -ss command) to 2h18min (after the -to command). So to remember how it is done, here is a simple one-liner: ffmpeg -i input.mp4 -ss 01:19:27 -to 02:18:51 -c:v copy -c:a copy output.mp4
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It is available for most platforms and has a ton of different options. Fortunately, there is a way to do this with the beautiful command-line utility FFmpeg. A much better solution is to perform “lossless” trimming. This reduces the quality of the video, and it also takes a long time. You can split and trim files in most graphical video editing software, but these will typically also recompress the export file. I have another blog post on cropping video files using FFmpeg.
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Splitting and trimming are temporal transformations. On a side note, sometimes people call this “cropping”, but in my world, cropping is to cut out parts of the image, that is a spatial transformation. I often have long video recordings that I want to split or trim.
#VIDEO CUTTER ONLINE .MOV HOW TO#
This is a note to self, and hopefully to others, about how to easily and quickly trim videos without recompressing the file.