[FFmpeg-user] Add filter_complex overlay to existing command.

[William C Bonner]

I found an example and was able to get a complex filtergraph working. I'm
replying to my original post in case it helps anyone else down the road.

ffmpeg -report -start_number 275 -i 1218%04d.JPG -start_number 275 -i
1218%04d.png -filter_complex
"[0]crop=in_w:9/16*in_w,drawtext=fontfile=C\\:/Windows/Fonts/consola.ttf:fontcolor=white:fontsize=main_h/16:y=main_h-text_h-50:x=main_w-text_w-50:text=WimsWorld,drawtext=fontfile=C\\:/Windows/Fonts/consola.ttf:fontcolor=white:fontsize=main_h/16:y=main_h-text_h-50:x=50:text=%{metadata\\:DateTimeOriginal}[1]overlay[out];"
-map [out] -c:v libx265 -crf 23 -preset veryfast -movflags +faststart -bf 2
-g 15 -pix_fmt yuv420p -y 1218-2160p30.mp4