[Python] FFMPEG not saving logs when converting to audio format

The command does not save or even create a file:

ffmpeg -i "video.mp4" -f mp3 "audio.mp3" -vstats_file "log_file.log"


And if you convert to a video file, everything normally creates and writes:

ffmpeg -i "video.mp4" -f mp3 "video.avi" -vstats_file "log_file.log"


Goal: to pull out the time from the log file and bind it to the process bar.

There are no problems with video, everything works. But with the sound does not work.

I tried the command:

ffmpeg -i "video.mp4" -f mp3 "video.avi" >2 "log_file.txt"


But there are other problems popping out. Since I run it all from the Python using the subprocess module.

ffmpegProc = subprocess.Popen(ffmpegCommand, startupinfo=startupinfo, shell=True)


, I can not kill the running process, because it is started with the attribute shell=True, and only the shell is killed.

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