Question

I need to run two ffmpeg commands, one after the other i.e., wait until the first command has finished, and then run the second command. The first command is

ffmpeg -threads 8 -i D:\imagesequence\dpx\brn_055.%04d.dpx D:\imagesequence\dpx\test2.mov

and the second is

ffmpeg -i D:/imagesequence/background.jpg -vf "movie='D\:/imagesequence/dpx/thumbnail.jpg' [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/3 [out]" D:/imagesequence/dpx/final_with_text_mod_04.jpg

What is the best way to accomplish this in Python?

Answer 1

You don’t have to do anything more than calling 2 times a ffmpeg command with subprocess python module, this is already the default behaviour

import subprocess

execstr1 = 'ffmpeg -x -y -z ...'
execstr2 = 'ffmpeg -a -b -c ...'

out1 = subprocess.check_output(execstr1, shell=True)

out2 = subprocess.check_output(execstr2, shell=True)