WIN10 – How to modify STDERR before writing to an outfile

In windows, How does one change STDERR before writing it to an out file? The goal is to create one log file containing all the ffmpeg integrity errors. ffmpeg-recursive-error.bat @echo off set “_var1_DoHeading=ZZZ” FOR /R “S:\#MiscDownloads\test\” %%G IN (*.mp4) DO ( echo Processing… %%G set “_var1_DoHeading=YES” echo [a – The value of _var1_DoHeading is %_var1_DoHeading%…

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