4/17/2023 0 Comments Ffmpeg cut video from list![]() Unfortunately, it will also reset the time, so that you have to adjust the end time (set with -to) based on the new beginning time of the video file. When -ss comes first, it will adjust to the nearest keyframe of the video. This is a trick described in the seeking part of the FFmpeg tutorial. So a trick is to move the -ss command before -i in the example above: ffmpeg -ss 01:19:27 -i input.mp4 -to 02:18:51 -c:v copy -c:a copy output.mp4 After some digging around I found that this may be because of lacking keyframes. ffmpeg -ss 00:00:30.0 -i input.wmv -c copy -t 00:00:10.0 output.wmv ffmpeg -ss 30 -i input.wmv -c copy -t 10 output.wmv. ![]() The timestamps need to be in HH:MM:SS.xxx format or in seconds (s.msec). I have sometimes experienced that the above commands leave black frames at the beginning of the video. ss option to specify a start timestamp, and the -t option to specify the encoding duration. ![]() This will extract 1min5sec (using the -t flag) starting from 1min10sec (the -ss flag) in the file. 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 the section from about 1h19min (after the -ss command) to 2h18min (after the -to command). This is all you need to do: ffmpeg -i input.mp4 -ss 01:19:27 -to 02:18:51 -c:v copy -c:a copy output.mp4 Fortunately, a simple way is to do this with the beautiful command-line utility FFmpeg. A much better solution is to perform “lossless” trimming. We used the -avoidnegativets makezero parameter. ![]() ![]() You can split and trim files in most graphical video editing software, but these will typically recompress the export file, reducing the video quality. Here we use ffmpeg to cut the video in.mp4 from second 8 to second 47. Cropping a video means cutting out parts of the image, and I have another blog post on cropping video files using FFmpeg. Splitting and trimming are temporal transformations and should not be confused with the spatial transformation cropping. I often have long video recordings that I want to split or trim. This is a note to self, and hopefully others, about how to easily and quickly trim videos without recompressing the file. ![]()
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