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• How to record video and audio with ffmpeg and pipe only audio to python process

  9 juin 2023, par urico12

  I have an ffmpeg command recording video and audio as one output and
I'm trying to add a second output to pipe out only the raw audio to python so that I can run additional processing on the audio chunks.

  


  from subprocess import Popen, PIPE, STDOUT

record_audio_video_command = f"ffmpeg -i small_bunny_1080p_60fps.mp4 \ 
                             -vcodec libx264 output.mp4 -f s16le pipe:1"

record_command = Popen(record_audio_video_command, 
                        shell=True, 
                        stdout=PIPE, 
                        stderr=STDOUT)

f = open("output.txt", "w")
data = record_command.stdout.read(320)
f.write(str(data))
while len(data) > 0:
    data = record_command.stdout.read(320)
    f.write(str(data))


  


  Is there a way to have ffmpeg pipe out only the raw audio bytes as one output, while still recording video and audio as the other output ?

  


• FFMPEG : Appending an audio file at a specified time in a video file with pre-existing audio results in no addition [duplicate]

  15 juin 2020, par JarsOfJam-Scheduler

  I have a video that contains images and a pre-existing audio.

  



  I have an audio file of a duration Y that I would want to start in this video, after 5 seconds. It must no replace the audio during these Y seconds, but be appended. As a result I should hear both audio during these Y seconds.

  



  What I've try to do is :

  



  ffmpeg -i the_video.webm -itsoffset 5 -i the_audio_file.mp3 -map 0 -map 1 -c:v copy resulting_video_with_both_audio.webm

  



  So it should add the_audio_file.mp3 after 5 seconds. It should take all the streams of the video file, and all the streams of the new audio file, and mix it.

  



  However my problem is that I only hear the audio of the video. I don't hear, indeed, the new audio at all. I should hear, during the first 5 seconds, the audio of the video. Then after 5 seconds, the audio of the video PLUS the Y seconds of the new audio file. Then after these Y seconds, the audio of the video until the end of the video.

  



  Do you know how to fix this bug ? Why doesn't this command work ? Please I would prefer an answer that doesn't use -filter (because this command'll be executed in a Python script).

  


• ffmpeg add background audio loop with video without overwriting existing audio

  5 mars 2021, par Munish Kapoor

  I am trying to add a new background audio loop using ffmpeg in the existing video

  


  but when the new audio has been added. It overwrites existing audio in the video.

  


  I tried this command

  


  ffmpeg  -i input.mp4 -stream_loop -1 -i input.mp3 -shortest -map 0:v:0 -map 1:a:0 -y out.mp4


  


  Please help