Generate smptebars with test text on top

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https://www.ffmpegbyexample.com/video/16x9.jpg
ffmpeg -f lavfi -i "smptebars=s=640x360" -vf drawtext="fontsize=220:text='16x9':x=(w-text_w)/2:y=(h-text_h)/2:fontcolor=White" -frames:v 1 -qscale:v 1 16x9.jpg