Depends on the containers that you use and the source you have.
If you have a source where the video is flipped due to a flag in the container (iirc only mov and mp4 support this) and you want to remove that flag remuxing with Hybrid (with 'Config->Containers->General->Rotation handling' set to 'ignore') should remove it.
Alternatively, assuming you use mov or mp4, you could use ffmpeg and something like
see: https://ffmpeg.org/ffmpeg-all.html#Video-Options (there are options to flip vertical and horizontal too)
to rotate the video 90° clockwise. (the '-c copy' makes sure no reencoding of the video&co takes place)
Cu Selur
Ps.: regarding trim https://github.com/mifi/lossless-cut might be interessting.
PPs.: mkv also supports rotation&co, so you could use mkvtoolnix-gui for this
If you have a source where the video is flipped due to a flag in the container (iirc only mov and mp4 support this) and you want to remove that flag remuxing with Hybrid (with 'Config->Containers->General->Rotation handling' set to 'ignore') should remove it.
Alternatively, assuming you use mov or mp4, you could use ffmpeg and something like
ffmpeg -display_rotation:v:0 90.0 -i input.mp4 -c copy output.mp4to rotate the video 90° clockwise. (the '-c copy' makes sure no reencoding of the video&co takes place)
Cu Selur
Ps.: regarding trim https://github.com/mifi/lossless-cut might be interessting.
PPs.: mkv also supports rotation&co, so you could use mkvtoolnix-gui for this