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• Transcode to ogg or webm, writing the file as it goes

  22 juillet 2020, par Mark Smith

  I need to transcode files (mp3, flac, m4a and others) to ogg or webm. (This is because I need them to play on Firefox 60.9 which does not support most of these, and flacs are too large. I cannot update the browser.)

  


  ffmpeg can do the transcoding, but when transcoding to ogg or webm, depending on the exact configuration, either 0 bytes or a few kB is written immediately, and then nothing more until the transcoding is complete (even using -flush_packets 1) — hence I cannot start playing the audio.

  


  By comparison, if I transcode to mp3, the file is written progressively and I can start playing immediately.

  


  Is it possible to transcode to ogg or webm in such a way that the file is written as the transcoding happens, and I can start playing it (almost) immediately ?

  


  Configurations I have tried :

  


  ffmpeg -i orig.m4a -c:a libvorbis -flush_packets 1 vorbis.ogg
ffmpeg -i orig.m4a -c:a libopus -flush_packets 1 opus.ogg
ffmpeg -i orig.m4a -c:a libvorbis -flush_packets 1 vorbis.webm
ffmpeg -i orig.m4a -c:a libopus -flush_packets 1 opus.webm


  


  This is running on Debian (Raspian stretch, specifically) and I would like to do it without adding dependencies from outside of the Debian/Raspian archives, if possible. Sticking with ffmpeg would be my ideal choice but will consider others.

  


• Moviepy/FFMPEG error while writing file : Permission denied

  26 février 2024, par rodinaxcvi

  I am using Power Automate to try to run this powershell script "python3 %Directory%%FileName%" :

  


  What my code is supposed to do :

  


  

  1. Download a video from youtube

  


  2. Put small clips from a folder in bottom left

  


  3. Overwrite audio from downloaded Youtube video with new audio from a folder in the same directory (I am replacing the video's audio with an .mp3 of someone narrating something)

  


  


  ERROR CODE :

  


  OSError: \[Errno 32\] Broken pipe

MoviePy error: FFMPEG encountered the following error while writing file combined_video_1TEMP_MPY_wvf_snd.mp3:

b'combined_video_1TEMP_MPY_wvf_snd.mp3: Permission denied\\r\\n'


  


  Code Snippet that seems to be throwing up error (NOT FULL CODE) :

  


  # Combine ad clips with main video footage
def combine_videos(main_video_path, ad_video_paths, output_path, bottom_videos_folder, custom_audio_path):
    main_clip = VideoFileClip(main_video_path).subclip(0, 60)  # Keep the original aspect ratio

    main_clip = main_clip.resize(width=1920)  # Resize based on width
    if main_clip.size[1] > 1080:
        main_clip = main_clip.resize(height=1080)  # Resize based on height if it's still too tall

    main_clip_x = (1920 - main_clip.size[0]) / 2
    main_clip_y = (1080 - main_clip.size[1]) / 2
    main_clip = main_clip.set_position((main_clip_x, main_clip_y))

    ad_clip = concatenate_to_duration(ad_video_paths, 60, bottom_videos_folder)  # Assuming 60 seconds for the ad clip
    ad_clip = ad_clip.resize(width=250)  # Resize the ad clip
    ad_clip = ad_clip.set_position(("left", "bottom"))  # Position the ad clip at the bottom right

    custom_audio = AudioFileClip(custom_audio_path)

    # Specify the output directory for the audio file
    output_audio_directory = "C:/Temp/AIContentCreator"
    output_audio_path = os.path.join(output_audio_directory, "custom_audio.mp3")

    # Write the custom audio to the specified directory
    custom_audio.write_audiofile(output_audio_path)

    main_clip = main_clip.set_audio(custom_audio)

    final_clip = CompositeVideoClip([main_clip, ad_clip], size=(1920, 1080))
    final_clip.write_videofile(output_path, fps=30)

    main_clip.close()
    ad_clip.close()
    custom_audio.close()

## SAVE PATHS ##
# Video Folder Paths
save_path = r"C:\Temp\Videos\YoutubeVideo"
bottom_videos_folder = r"C:\Temp\Videos\BottomVideo"
custom_audio_path = r"C:\Temp\AIContentCreator\GPTContentCreation\output.mp3"  # Existing audio file path

# Download videos from a playlist
playlist_url1 = ''
videos_playlist1 = download_playlist(playlist_url1, save_path)

# Prepare bottom videos
bottom_videos = list_videos_in_folder(bottom_videos_folder)

# Combine each pair of videos and export 
combined_video_counter = 1  
for main_video in videos_playlist1:
    shuffled_ads = random.sample(bottom_videos, len(bottom_videos))
    ad_video_paths = [os.path.join(bottom_videos_folder, ad) for ad in shuffled_ads[:5]]  # Adjust number as needed

    combined_video_path = r'C:\Temp\Videos\TiktokVideos\combined_video_{combined_video_counter}.mp4'
    
    # Call the combine_videos function with the existing custom_audio_path
    combine_videos(main_video, ad_video_paths, combined_video_path, bottom_videos_folder, custom_audio_path)
    
    combined_video_counter += 1
`


  


  What I've tried :

  


  

  • Setting all related folders to full access

  


  • Setting full directory paths in my code

  


  • Running Power Automate and CMD as administrator

  


  • Moving files to a different folder like /Temp to see if permission error still consists

  


  


  Reoccurring problems :

  


  


  • I am not sure where MoviePy is writing "b'combined_video_1TEMP_MPY_wvf_snd.mp3". Could it be trying to place that file in another directory with out proper permissions ?

    


  


  • Whenever I try to de-select read-only on TiktokVideos folder and refresh it, "Read-only" is still on. Keeps doing this.

    


  


  


• ffmpeg in "streaming mode" suddenly stops writing output file and resumes after several minutes

  29 juin 2018, par EliA

  I’m using ffmpeg to convert chunks of media in webm format to a wav file in a "continuous stream" mode.

  Using a python wrapper, I’m feeding ffmpeg a webm chunk (let’s say 1 chunk each second) and ffmpeg continuously writes the output wav (then, in a separate thread I’m reading this wav file and pass the new data forward).

  This works well most of the time, but some times, I get this weird behavior :

  • after some chunks are processed and output to the wav file, ffmpeg stops writing to the output file (the file stops growing but ffmpeg keeps getting the webm chunks)
  • this can go on like this for several minutes, and then ffmpeg resumes writing to the wav file
  • eventually, the complete wav file is written successfully, but this causes huge delays in the streaming process.

  Looking at CPU and memory usage, this doesn’t seem to be the issue.

  Any ideas as to what could cause ffmpeg to stop streaming for several minutes and then resume ?
  This can happen after 30 seconds, after 3 minutes or after an hour of streaming media chunks and the time it takes ffmpeg to resume also varies.

  In my python code, I’m basically opening a subprocess.Popen() process and write to the process’ stdin to feed ffmpeg the media chunks.

  So my code looks something like :

  ffmpeg_proc = subprocess.Popen('ffmpeg -y -f webm -i - -ac 1 -ar 16000  -f wav /tmp/out.wav', shell=True, stdin=subprocess.PIPE)
  
  
  
  for chunk in chunks:
  
      ffmpeg_proc.stdin.write(chunk)

  I’m using python 3.6 and ffmpeg version 2.8.14-0ubuntu0.16.04.1

  Thanks in advance !