FFmpeg can be used for batch lossless video cutting

Sadly, not many video editing tools support lossless cutting -- and even fewer support batch processing.

Fortunately, FFmpeg supports lossless cutting using the -ss hh:mm:ss option and, being a command line tool, it can be used for batch processing.

Here's an example (on POSIX) that cuts roughly the first 26 seconds off of each video in Videos/ (lossless and aligned to keyframes), putting the resulting videos into out/ (you can't edit in place losslessly):

find Videos -name '*.mp4' -exec ffmpeg -i {} -ss 26 -c copy out/{} \;

The find command runs the -exec ... command for each *.mp4 file, with {} substituted for the filename (including any spaces--also note the \; at the end), so the FFmpeg command line is similar to:

ffmpeg -i video.mp4 -ss 26 -c copy out/video.mp4

Explanation:

• -i video.mp4: Opens video.mp4
• -ss 26: Only keeps the video starting near 26 seconds (next keyframe)
• -c copy: Copies video/audio streams (i.e. losslessly cuts) -- this option is needed to avoid re-encoding!
• out/video.mp4: Writes the output to out/video.mp4

Note: on Windows, you could use for %i in (*.mp4) do ffmpeg -i %i ....