I need to cut MP4 videos. A part at the beginning and a part at the end in a batch fashion

Question

I have several training videos. All .MP4s.

I want to remove 3.5 seconds from the beginning and 4.5 seconds from the end of the entire folder of them...

I know of ffmpeg and ffprobe - but my knowledge and mastery of them both is limited.

Can someone provide a script for this, or, at least a program that will make this easy for me? I keep searching and I reach dead-ends everytime or scripts that do not work.

I am also open to using Linux/Windows but not mac.

edit: First part completed. Will keep on studying this command further in order to learn batch; Here's the easy part, how to batch trim an entire folder of MP4s:

for %%a in ("*.mp4") do ffmpeg -i "%%a" -ss 00:00:03.5 -vcodec copy -acodec copy "newfiles\%%~na.mp4"

pause

Answer 1

I kindly thank everyone here for encouraging me to keep searching, I found a solution that is perfect. Here it is. I am afraid the examples given even in the comments elude me but I will still try to read up and educate myself on how those commands work. Thanks again. Replace 8.25 (end trim) and 4.25 (beginning trim) and change the values until you are satisfied with the outputs.

@Echo Off
SetLocal
Set "ext=mp4"
Set "opts=-v quiet"
Set "opts=%opts% -print_format "compact=print_section=0:nokey=1:escape=csv""
Set "opts=%opts% -show_entries "format=duration""
If Exist *.%ext% (If Not Exist "Trimmed\" MD Trimmed)
For %%a In (*.%ext%) Do Call :Sub "%%~a"
Exit/B

:Sub
For /f "Tokens=1* Delims=." %%a In (
    'FFProbe %opts% %1') Do (Set/A "ws=%%a-8.25" & Set "ps=%%b")
rem If %ws% Lss 20 GoTo :EOF
Set/A hh=ws/(60*60), lo=ws%%(60*60), mm=lo/60, ss=lo%%60
If %hh% Lss 10 Set hh=0%hh%
If %mm% Lss 10 Set mm=0%mm%
If %ss% Lss 10 Set ss=0%ss%
FFMpeg -i %1 -ss 00:00:04.2500 -to %hh%:%mm%:%ss%.%ps:~,3% -c:v copy -c:a copy "Trimmed\%~1"