If you are using the latest ffmpeg from anycodings_video git master it will do this using an edit anycodings_video list when invoked using the command that anycodings_video you provided. In anycodings_video other words, if the closest keyframe anycodings_video before 3s is at 0s then it will copy the anycodings_video video starting at 0s and use an edit anycodings_video list to tell the player to start playing anycodings_video 3 seconds in. With the mp4 container it is possible to anycodings_video cut at a non-keyframe without anycodings_video re-encoding using an edit list.

Because anycodings_video non-keyframes encode differences from anycodings_video other frames, they require all of the anycodings_video data starting with the previous anycodings_video keyframe. You probably do not have a keyframe at anycodings_video the 3 second mark. For more anycodings_video information, look at this official anycodings_video ffmpeg article.

Please note that the current highly anycodings_video upvoted answer is outdated and the trim anycodings_video would be extremely slow. c anycodings_video copy: This is an option to trim via anycodings_video stream copy. 00:02:00: This is the time anycodings_video your trimmed video will end with. to: This specifies anycodings_video duration from start (00:01:40) to end anycodings_video (00:02:12). 00:01:00: anycodings_video This is the time your trimmed video will anycodings_video start with.

ss: anycodings_video Used with -i, this seeks in the input anycodings_video file (input.mp4) to position. In anycodings_video that case, it is (input.mp4). This command trims your video in anycodings_video seconds! It is the fastest and anycodings_video best ffmpeg-way I have figure it out: ffmpeg -ss 00:01:00 -to 00:02:00 -i input.mp4 -c copy output.mp4

Ffmpeg cut video from time to time