ffmpeg is a powerful cross-platform solution to record, convert and stream audio and video.

You can also use ffmpeg to trim videos without reenconding in seconds:

ffmpeg -i presentation-video-input.mp4 -c copy -ss 0:10:55 -to 0:36:18 presentation-video-output.mp4
  • -i url: input file.
  • -c copy: indicates that the stream is not to be re-encoded.
  • -ss position: start video from this position.
  • -to position: end video at this position.