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• 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

  


• FFMPEG avoid_negative_ts makes video start not from keyframe

  7 mars 2019, par Void Floyd

  Let’s say I want to cut part of the mp4 video and resize it from 1280x720 to 854x480.

  My command looks like this :

  ffmpeg -ss 45 -i source.mp4 -ss 10 -to 20 \
  
  -acodec aac -ar 44100 -ac 2 -c:v libx264 \
  
  -crf 26 -vf scale=854:480:force_original_aspect_ratio=decrease,pad=854:480:0:0,setsar=1/1,setdar=16/9 \
  
  -video_track_timescale 29971 -pix_fmt yuv420p \
  
  -map_metadata 0 -avoid_negative_ts 1 -y dest.mp4

  The problem is, when I don’t use option avoid_negative_ts, resulting video has some issues with time bases etc, therefore it cannot be later converted by other libs, for example Swift’s AVFoundation.

  But when I use this option - video does not start with keyframe.
  By using ffprobe I see start_time=0.065997 or other times other than 0.

  How can I use option avoid_negative_ts and have a video that starts with keyframe ?

• Why does ffmpeg not work with some files ?

  18 février 2018, par Hollo1001

  I’m using FFmpeg and PHP to generate thumbnails from video and get their data. It seems to work ok, but some files just output no thumbnails and also no data(specs like time, height...). I have searched a lot online, but have not found anything like that. Have I missed something ? If you have an idea whats wrong, would be cool if you could help me and maybe others how might have such a problem.
  Here is my PHP code for the specs :

  function _get_video_attributes($video, $ffmpeg) {
  
  
  
      $command = $ffmpeg . ' -i ' . $video . ' -vstats 2>&1';
  
      $output = shell_exec($command);
  
  
  
      $regex_sizes = "/Video: ([^,]*), ([^,]*), ([0-9]{1,4})x([0-9]{1,4}), ([^,]*), ([0-9]{1,4})/"; // or : $regex_sizes = "/Video: ([^\r\n]*), ([^,]*), ([0-9]{1,4})x([0-9]{1,4})/"; (code from @1owk3y)
  
      if (preg_match($regex_sizes, $output, $regs)) {
  
          $codec = $regs [1] ? $regs [1] : null;
  
          $width = $regs [3] ? $regs [3] : null;
  
          $height = $regs [4] ? $regs [4] : null;
  
          $fps = $regs [6] ? $regs [6] : null;
  
      }
  
  
  
      $regex_duration = "/Duration: ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2}).([0-9]{1,2})/";
  
      if (preg_match($regex_duration, $output, $regs)) {
  
          $hours = $regs [1] ? $regs [1] : null;
  
          $mins = $regs [2] ? $regs [2] : null;
  
          $secs = $regs [3] ? $regs [3] : null;
  
          $ms = $regs [4] ? $regs [4] : null;
  
      }
  
  
  
      return array('codec' => $codec,
  
          'width' => $width,
  
          'height' => $height,
  
          'hours' => $hours,
  
          'mins' => $mins,
  
          'secs' => $secs,
  
          'ms' => $ms,
  
          'fps' => $fps,
  
      );
  
  }

  And the thumbs :

  if($duration < 10){
  
          $interval = floor($duration / 2);
  
          $image = "thumb/".$filenopath."_thumb_".$num.".jpg";
  
          shell_exec($ffmpeg." -ss ".$interval." -i ".$upfile." -vf select='eq(pict_type,I)' -vframes 1 -vf scale=-1:240 ".$thumb."00".$i.".jpg");
  
          rename($image,"thumb/".$image);
  
  }else{
  
  for ($i = 1; $i <= 6; $i++) {
  
          $interval = floor(($i - 0.5) * $duration / $i);
  
          $log  = $ffmpeg." -ss ".$interval." -i ".$upfile." -vf select='eq(pict_type,I)' -vframes 1 -vf scale=-1:240 ".$thumb."00".$i.".jpg".PHP_EOL;
  
          //file_put_contents('./log'.date("j.n.Y").'.txt', $log, FILE_APPEND);
  
          shell_exec($ffmpeg." -ss ".$interval." -i ".$upfile." -vf select='eq(pict_type,I)' -vframes 1 -vf scale=-1:240 ".$thumb."00".$i.".jpg");
  
  }