ffmpeg - How to use output for another action in one command line?

I have for example this command:

ffmpeg -loop 1 -i image.jpg -i input.mp3 -ss 00:08:02.00 -t 137 -vf scale=nhd -r 1 -c:v libx264 -c:a aac -shortest output.mp4

which suppose to take an mp3 file and a picture and combine it to one video file mp4. Now how can i add a watermark using this command for example:

ffmpeg -i input.mp4 -i watermark.jpg -filter_complex overlay=main_w-overlay_w-5:main_h-overlay_h-5 output.mp4

But doing all of this in one time command and not re encoding twice or to wait for one command to finish and then do another one.

Thanks!

Answer

Use

ffmpeg -loop 1 -i image.jpg -i watermark.jpg -ss 00:08:02.00 -t 137 -i input.mp3 -filter_complex [0]scale=nhd,setsar=1[v];[v][1]overlay=W-w-5:H-h-5 -r 1 -c:v libx264 -c:a aac -shortest -fflags +shortest output.mp4