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I`ve been trying to create a batch file that merges all files in a folder using avidemux. Ideally, it would be awesome if this works to do some changes as well (basically rescaling the video).

I have tried with this .bat file but it does not do what I intended:

set avidemux="C:\Program Files\Avidemux 2.7 VC++ 64bits\avidemux.exe"

set videocodec=mp4

for %%f in (*.mp4) do %avidemux% --video-codec %videocodec% --force-alt-h264 --load "%%f" --append "%%f" --save "%%f.avi" --quit

What this does is just open each file individually and save it individually, not actually merging them.

If there are any one-click solutions for this kind of issue it would be also appreciated.

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Ok I have found a solution using ffmpeg instead of avidemux. I made the following batch file. In this case, I had to know the folder where the ffmpeg executable was, and also i managed to convert the resolution to a different one

for %%f in (*.mp4) do (
    echo file %%f >> list.txt
)
F:\ffmpeg\bin\ffmpeg.exe -f concat -safe 0 -i list.txt -vf scale=320:240 output.avi
del list.txt

This did the trick!

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