[raffriff42]

Originally Posted by StainlessS

need to detect and return ERRORLEVEL from ffmpeg call

1. Detecting an error level: it's easiest if you only care if %errorlevel% is zero (success) or nonzero (failure)

[try something...]
if errorlevel 1 goto failed
[do stuff]
goto :EOF

:failed
@echo failed! try again!
pause
goto :EOF

"if errorlevel 1" is true if %errorlevel% is 1, OR GREATER

If you want the exact error level, it's harder. See this (robvanderwoude.com)

2. Returning an error level from a batch file:

exit /b 42

To test this, after you run the batch file, type:

echo %errorlevel%

EDIT AutoHotkey, AutoIt, C++, C# etc can run a process and store the exit code.

EDIT sorry, it's "if errorlevel 1" not "if %errorlevel% 1"