ffmpeg cut off first 10 seconds of video then add intro 15 seconds in

[PeterWall]

Hey!

New to ffmpeg but this should be possible. Basically what I want is to have a script that is able to in bulk cut out the first 10 seconds of every video then add my intro.mp4 15 seconds into the video. The same intro.mp4 file should also be added at the end of the video.

At the moment I'm using this code which I found somewhere... It's a good foundation but I need to add the intro.mp4 15 seconds into the video and I need to cut of the first 10 seconds of the video. Oh and i'd also like to add a watermark (overlay.png) in the corner of the video. (Something like this: -i "%%a" -i overlay.png -filter_complex "overlay = 20:20"). I'd really appreciate any help as I'm very new to FFmpeg

SET RESOLUTION="1280:720"
SET INPUT_FOLDER="input"
SET INTRO="intro.mp4"
SET OUTPUT_FOLDER="output"

for %%a in ("%INPUT_FOLDER%\*.*") do ffmpeg -i %INTRO% -i "%%a" -filter_complex "[0:v]scale=%RESOLUTION%:force_original_aspect_ratio=1,p ad=%RESOLUTION%ow-iw)/2oh-ih)/2[v0]; [1:v]scale=%RESOLUTION%:force_original_aspect_ratio=1,p ad=%RESOLUTION%ow-iw)/2oh-ih)/2[v1]; [v0][0:a][v1][1:a]concat=n=2:v=1:a=1[v][a]" -map [v] -map [a] "%OUTPUT_FOLDER%\%%~na.mp4"

[butterw]

adding a watermark means re-encode (not lossless).

[PeterWall]

adding a watermark means re-encode (not lossless).

Well, that's what I need. I've succeeded to add a watermark in a separate script but I don't know how to put it all together in one script and make it work.