gdal_merge_mosaïc TIF

Hi

I'd like to assemble images *".TIF" which total size is 8Go, to have 1 image which size would be the smallest possible (with the best quality of course!).
- I add "@cmd.exe /V:ON" at the end of OSGEO4W.BAT to activate additional functionalities to create a list of files in the form of variables.
- Then:

• cd /d c:\Image

• set liste= [ ]
• for %c in (*.tif) do set liste=%c !liste!
• gdal_merge -of GTiff -co "TFW=yes" -co "BIGTIFF=yes" "c:\Image\Test.tif" %liste%

But the prompt answers: "THE ENTERED LINE IS TOO LONG".

What it doesn't like?

Is it the correct method to assemble and reduce image'size?

Best regards

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