If memory serves me right the audio is copied as the full stream, but has an offset in the container (for offset playback). The video will not be an exact cut because of the keyframe offset.
If I want to cut losslessly I can add the additional ffmpeg parameter, or typically use it on the command line directly.įfmpeg -ss 1:30 -i in.mkv -c copy out.mkv (from the top of my head) would cut of the first 1min 30s, but losslessly. You can first test PlumePack with the FREE version, which will allow you to fully analyze your project and give you information about how much data you could save with trimming and also details files by files. For my use case the videos are high quality enough that reencoding is not a big issue. way of losslessly trimming a video file without encoding is to use PlumePack Premium, our Panel product in Premiere Pro. I created my own video editor for cutting which also uses ffmpeg (like OP). LosslessCut is a simple and ultra fast cross platform tool for lossless trimming/cutting of video and audio files. I expect project files to keep sources unedited. I would imagine the standard workflow preferring exact cutting over losslessness. I don’t know or have an overview of how various video editors handle this. This is an inherent technical limitation. Visualization for the above example: * ° ° ° * ° ° ° * ° ° This is one Simple, cross-platform tool for lossless trimming / cutting of video and audio. If you have 1 complete frame and then 3 differential frames, you can not cut off the previous frames at frame 3 because frame 3 and 4 will be missing information to display the full image. In the next article we are going to take a look at LosslessCut. Compared to other video-cutting programs, Bandicut allows you to. Modern codecs encode the video image sequence into key frames and differential frames. Lossless video-cutting software is able to cut specific parts of a video without re-encoding.
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