All values seems to be right to convert the video into exactly 320x240 pixel without adding black borders or cutting the picture. Which size does the original video have ? Width and Height ?
If the size is lower than 320x240, vidrop must add borders to reach 320x240. If the size is bigger than 320x240, vidrop compresses the picture until 320x240 has been reached.
You could try a Width of 400 instead of 320, even in the Extra Parameter: -vf-add expand=400:240:-1:-1:1
Will this fit to the screen or will the picture be more cutted like before ?
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