#!/bin/bash
fmpeg -hide_banner -v error -i red.mp4 -vf drawtext=fontfile=SentyTANG.ttf:fontsize=80:textfile="$1":x=0:y=0+0*print\(th\, 16 \) -vframes 1 -f null -


but:


(fuyin) ➜  /tmp ./fontsize_test.sh 22.md
[AVFilterGraph @ 0x7fcda0c05460] No such filter: '16)'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0