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• Ffmpeg : Move a slider "image" over a "background" from 0% to 100% in sync with the audio

  7 février 2014, par Znuff

  I'm trying to create a video using the follwing code :

  `$`ffmpeg -loop 1 -r 5 -i video.png -r 5 -i progress.png -filter_complex "overlay=x='if(gte(t,0), -W+(t)*5, NAN)':y=H-h" -i video.mp3 -acodec copy video.mp4

  I have the following files

  • video.png
    • this is a 1280x720 px still frame that is simply a background with a waveform of the video.mp3 file
  • progress.png
    • this is simply a 1280x100 px semi-transparent image that should simulate an animation (from from 0 to 100% of the width of the video.png file, in order to simulate "fill up" animation.

  My issues are as following :

  • The video is not in sync with the audio. The progress bar is way off, instead of finishing at the end of the song, it just keeps going on and on and on and on...
  • Also... it just keeps going on and on ! I left it create a 1 hour video and it never stopped.

  I know I'm missing something in the filter, but I have no idea how I could fix it.

  Could someone lend me some help ?

• why changed volume after merge ? in ffmpeg. How to turn off change volume [duplicate]

  13 décembre 2017, par Нодирбек Раззоков

  This question already has an answer here :

  • FFMPEG amix filter volume issue with inputs of different duration
    
    4 answers
    

  why changed volume after the merge ? in FFmpeg.

  How to turn off change volume. I need an original volume of music after the merge.

  please check my command

  ffmpeg -i song.mp3 -i mix.mp3 -filter_complex \"[1]adelay=10000|10000[b];[0][b]amix=2,volume='1-max(0.25*(t-13),0)'\" -ac 2 -i cover.jpg -c copy -id3v2_version 3 -codec:a libmp3lame -q:a 4 -b:a 128k -y output.mp3

• Concatenating audio files and superimposing over video

  25 avril 2022, par kah

  I'm trying to write a program that takes a bunch of videos from a folder, compiles them, and then takes another bunch of audio files from a folder and concatenates them to then overlay the combined audio on top of the final video (hope that makes sense). I'm able to process the videos into one final output video, but I keep running into trouble combining the audio. Below I've provided two small sections of code pertaining to audio comp, I'm using moviepy to process the videos and attempting to use it for audio as well.

  


  songDirectory = './songs/'
songList = []
songs = []
audioclip=''

def makeCompilation():
    for filename in os.listdir(songDirectory):
        f = os.path.join(songDirectory, filename)
        if os.path.isfile(f) and filename.endswith(".mp3"):
            audioclip = moviepy.editor.AudioFileClip(f)
            songList.append(filename)


    for song in os.listdir(songDirectory):
        c = os.path.join(songDirectory, song)
    audio_clips = moviepy.editor.AudioFileClip(c)
    audio_output = moviepy.editor.concatenate_audioclips(audio_clips)
    finalClip = concatenate_videoclips(videos, method="compose")
    final_duration = finalClip.duration    
    final_audio_output = audio_output.set_duration(final_duration)
    final_output= finalClip.set_audio(final_audio_output).fx(afx.audio_fadein, 3.0)


    audio_path = "./songs/tempaudiofile.m4a"

    #print(description)
    # Create compilation
    final_output.write_videofile(outputFile, threads=8, temp_audiofile=audio_path, remove_temp=True, codec="libx264", audio_codec="aac")

    return description


  


  The program appeared to be able to find the audio directory, but I needed to be able to use os.path.join(songDirectory, filename) to point directly to each mp3 file so I messed around with it until I got the above code. And when I attempted to iterate through songList, I, as expected, got an error saying that 'str' wasn't iterable, and other errors saying that 'str' has no attribute 'duration'. Essentially, all I need it to do is iterate though the input folder and combine the files by whatever means. Code currently returns the output :

  


  &#127794;Free Fredobagz x Aflacko x Flint type beat - &#x27;Default_Dance&#x27; [prod. kah]-jro0v6ogZ0Y.mp4&#xA;225.05&#xA;Total Length: 225.05&#xA;225.05&#xA;Traceback (most recent call last):&#xA;  File "/Users/daddyK/Desktop/comp_ bot/make_compilation3.py", line 127, in <module>&#xA;makeCompilation(path = "./videos/",&#xA;  File "/Users/daddyK/Desktop/comp_ bot/make_compilation3.py", line 110, in makeCompilation&#xA;audio_output = moviepy.editor.concatenate_audioclips(audio_clips)&#xA;  File "/Users/daddyK/Library/Python/3.10/lib/python/site-packages/moviepy/audio/AudioClip.py", line 315, in concatenate_audioclips&#xA;durations = [c.duration for c in clips]&#xA;TypeError: &#x27;AudioFileClip&#x27; object is not iterable&#xA;</module>

  


  ---

  


  At this point I'm a bit stumped, so if anybody could offer some insight as to what I should do to resolve the error and/or if I'm headed in the right direction code-wise I'd greatly appreciate it ! Sorry if the code doesn't make any sense I'll post the whole .py file if needed