Joining audio file and all frame picture to video format with Python ffmpeg

Question

i have a tmp directory which contains a collection of image frames and audio files. i am using linux mint 19.3 and python3.8. in the terminal I type ffmpeg -i tmp/%d.png -vcodec png tmp/output.mov -y and ffmpeg -i tmp/output.mov -i tmp/audio.mp3 -codec copy output.mov -y then the collection of images and audio in the directory will become a complete video. that I asked

1. when I run it in python using the syntax call(["ffmpeg", "-i", "tmp/%d.png" , "-vcodec", "png", "tmp/output.mov", "-y"],stdout=open(os.devnull, "w"), stderr=STDOUT) and call(["ffmpeg", "-i", "tmp/output.mov", "-i", "tmp/audio.mp3", "-codec", "copy", "output.mov", "-y"],stdout=open(os.devnull, "w"), stderr=STDOUT) it does not merge into a video (without output error)
2. I tried the syntax os.system("ffmpeg -i tmp/%d.png -vcodec png tmp/output.mov -y") and os.system("ffmpeg -i tmp/output.mov -i tmp/audio.mp3 -codec copy output.mov -y"), the video failed to merge with the error output tmp/output.mov: No such file or directory

Please help. thank you

Answer 1

Use the full path

Instead of tmp/output.mov use /tmp/output.mov. Do this for the rest of the inputs and outputs.

Do everything in one command

ffmpeg -y -i /tmp/%d.png -i /tmp/audio.mp3 -codec copy -shortest output.mov