With "Kdenlive", you start it, pick a resolution (you can use the same as the original video or change it), then add your video clip to the project, you will usually be asked to change the default profile (output) format to match the video clip or choose another, then click the video clip on the left to highlight it, and on the right side is the "clip monitor" where you can click play and mark the beginning point (zone start) of the clip you want to save (excluding the beginning part you do not want), click towards the end of the video clip's timeline to jump to the end, go forward or backwards if need be, then mark then ending point (zone end) excluding the ending part you do not want, then click your mouse and hold it down in the "clip monitor" and drag it to a project time line below, move it with your mouse to the far left if it is not already, then click "Render" to render the video into various video formats that you can choose from the drop down list box.
If you are not using Linux Mint KDE, you might want to install the "kde-runtime" as well which is perfectly safe to do in any edition of Linux Mint. The excellent "Kdenlive" video editor can easily do this as well. Most of the good video editors can easily do this without altering the original file. If you run " inxi -Fxzd" from the console terminal prompt, highlight the results, copy and paste them back here, that should provide enough information. It would help to know more about your system setup. I just read your post and the good replies to it. The above example will trim off the first 30 seconds of each clip. This will stream copy, so no re-encoding will be done. Select preset "Mux" and whatever format you need.
Then put it in place of the "preset.xml" found in Home/User/.winff (you'll need to enable hidden files via Ctrl+H). f mov -c:v png -pix_fmt rgba -movflags faststart -an vf scale=640:-1:sws_dither=a_dither -pix_fmt rgb8 -loop 0 -an
c:v libvpx-vp9 -pix_fmt yuv420p -qmin 0 -qmax 50 -crf 5 -b:v 5M -threads 8 -c:a libvorbis -b:a 128k -f webm c:v libx264 -level 40 -pix_fmt yuv420p -preset slow -crf 22 -threads 8 -c:a aac -strict experimental -ar 48000 -ab 128k -f mp4 c:v libx265 -aspect 16:9 -pix_fmt yuv420p -preset medium -x265-params crf=25 -c:a aac -strict experimental -ar 48000 -ab 128k -f mp4 c:v libx264 -level 41 -pix_fmt yuv420p -preset medium -crf 20 -bufsize 15000k -maxrate 30000k -g 24 -threads 8 -c:a aac -strict experimental -ar 48000 -ab 256k -f mp4
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