trouble to create custom command button

[lalio]

Hi!

I'd like to merge a video and an audio, which are selected in the same panel, a file with ffmpeg using a custom tootlbar button.

In the command line is now:

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%COMSPEC% /K "%%ProgramFiles%%\ffmpeg\bin\ffmpeg.exe"

(%COMPSEC /k for debugging)
In the parameters line:

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 -i %P%C1 -i %P%C2 -c copy %P%C2:~0,-10.mkv

I get "The filename, directory name, or volume label syntax is incorrect." error.

Could please somebody help, how to correct my command?

Thank you!

[beb]

To begin with, there's no need to double %%; so %ProgramFiles% would be enough.

Secondly, %C1 and %C2 return the full names of the selected files, so there's no need to add a path (%P) there.

Finally, the below version might work:

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cmd=%COMSPEC% /k "%ProgramFiles%\ffmpeg\bin\ffmpeg.exe"
param=-i %C1 -i %C2 -c copy %C2:~0,-10.mkv