How to combine these two FFmpeg commands into one command?

Question

I'm using ffmpeg to modify multiple .mp4 files.

First I use this command to change the default language from eng to fr.

ffmpeg.exe -i "imput 1.mp4" -map 0 -c copy -disposition:a:0 0 -disposition:a:1 default "Output 2.mp4" 

Then I want to use this command to add soft subtitles from the .srt file to the .mp4.

ffmpeg.exe -i "Input 1.mp4" -i "Input 2.srt" -c copy -c:s mov_text -metadata:s:s:0 language=fr "Output 1.mp4"

These two commands work independently but I would like to combine them in one line.

I tried something like this but only the audio changes, there is no effect on subtitles.

ffmpeg.exe -i "Input 1.mp4" -i "Input 2.srt" -map 0 -c copy -disposition:a:0 0 -disposition:a:1 default -c:s mov_text -metadata:s:s:0 language=fr Output 1.mp4"

I know there is something wrong but I can't figure it out.

Can somebody tell me what's wrong with my combined command?

Then as I said before, I'm working on multiple files (314 exactly) and each file has it's own name and it's tedious to manually change the filename each time. Is there a way to do it for each file present in a directory?

Answer 1

Try this inside the folder where the videos + the subtitles are open the command prompt and use this command:

for %a in (*.mkv *.mp4) do ffmpeg -i "%a" -i "%~na.srt" -map 0 -map 1:s:0 -disposition:a:0 0 -disposition:a:1 default -c copy -metadata:s:s:0 language=fr "%~na_new.%~xa"

It should create a new video with the same name as the old one but with a "new" in the name and audio and subs changed.