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• FFMPEG Loudnorm reading JSON data

  9 juillet 2022, par NineCattoRules

  I tried to normalize some audio files using FFMPEG Loudnorm as described here.

  


  However, in Python, I don't understand how to read data info from 1st pass.

  


  My code :

  


  getLoud =  subprocess.Popen(f"ffmpeg -i {file_path} -filter:a loudnorm=print_format=json -f null NULL", shell=True, stdout=subprocess.PIPE).stdout
getLoud =  getLoud.read().decode()
# parse json_str:
jsonstr_loud = json.loads(getLoud)


  


  This gives me "errorMessage": "Expecting value: line 1 column 1 (char 0)"

  


  I tried also this :

  


  os.system(f"ffmpeg -i {file_path} -filter:a loudnorm=print_format=json -f null NULL")


  


  and it outputs :

  


  ffmpeg version N-60236-gffb000fff8-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2022 the FFmpeg developers...
...
[Parsed_loudnorm_0 @ 0x5921940] 
{
    "input_i" : "-9.33",
    "input_tp" : "-0.63",
    "input_lra" : "0.60",
    "input_thresh" : "-19.33",
    "output_i" : "-24.08",
    "output_tp" : "-15.40",
    "output_lra" : "0.60",
    "output_thresh" : "-34.08",
    "normalization_type" : "dynamic",
    "target_offset" : "0.08"
}


  


  In Python, how can I use those parameters, such as input_i, input_tp etc. that I need for the 2nd pass ?

  


  I can't use ffmpeg-normalize because I'm using FFMPEG as a Layer in Lambda.

  


• OSError : [Errno 9] Bad file descriptor when downloading using pytube and playing with discord.py

  15 septembre 2022, par Trevor Mathisen

  When using pytube to download a YouTube video and discord.py to play it, I am getting a OSError : [Errno 9] Bad file descriptor error. I've had this working at one point and can't seem to figure out what I changed which broke it.

  


  Full traceback :

  


  2022-09-15 20:20:44 INFO       discord.voice_client The voice handshake is being terminated for Channel ID 902294184994693224 (Guild ID 902294184994693220)
2022-09-15T20:20:44.010142763Z 2022-09-15 20:20:44 INFO     discord.voice_client Disconnecting from voice normally, close code 1000.
2022-09-15T20:20:44.058592513Z 2022-09-15 20:20:44 ERROR    discord.player Exception in voice thread Thread-5
2022-09-15T20:20:44.058623864Z Traceback (most recent call last):
2022-09-15T20:20:44.058629130Z   File "/usr/local/lib/python3.10/dist-packages/discord/player.py", line 698, in run
2022-09-15T20:20:44.058632003Z     self._do_run()
2022-09-15T20:20:44.058634500Z   File "/usr/local/lib/python3.10/dist-packages/discord/player.py", line 691, in _do_run
2022-09-15T20:20:44.058637013Z     play_audio(data, encode=not self.source.is_opus())
2022-09-15T20:20:44.058639334Z   File "/usr/local/lib/python3.10/dist-packages/discord/voice_client.py", line 683, in send_audio_packet
2022-09-15T20:20:44.058648759Z     self.socket.sendto(packet, (self.endpoint_ip, self.voice_port))
2022-09-15T20:20:44.058653057Z OSError: [Errno 9] Bad file descriptor
2022-09-15T20:20:44.058673762Z 2022-09-15 20:20:44 INFO     discord.player ffmpeg process 12 has not terminated. Waiting to terminate...
2022-09-15T20:20:44.062083854Z 2022-09-15 20:20:44 INFO     discord.player ffmpeg process 12 should have terminated with a return code of -9.


  


  Dockerfile :

  


  ENV MEDIA_DIR='/media/'
RUN mkdir -p /media


  


  Download function (check_path returns True, showing the file is there) :

  


  def download_videos(stream, filename):
    print(f'downloading {filename}')
    filepath = stream.download(output_path=config_db.environ_path, filename=f'{filename}.mp4')
    print(f'completed download of {filepath}')
    check_path = Path(filepath)
    if check_path.is_file():
        print(check_path)
    return filepath


  


  Play function :

  


  async def play(voice_channel, message, control = None):
    vc = get_vc()
    if not vc:
        vc = await voice_channel.connect()
    next_yt = YouTube(next_song)
    next_file = sub(r'\W+', '', next_yt.title.replace(' ', '_').replace('__', '_')).lower()
    next_song_path = download_videos(next_yt.streams.filter(only_audio=True, file_extension='mp4')[0], next_file)

    await message.channel.send(f'Done getting ready, I\'ll be there in a moment.')

while next_song:
    while vc.is_playing():
        await asynciosleep(0.5)
        continue

    try:
        vc.play(FFmpegPCMAudio(next_song_path))
        print(f'Playing {next_song_path} with latency of {vc.average_latency}')
        vc.source = PCMVolumeTransformer(vc.source, volume=0.15)
    except Exception as e:
        print(e)
        await vc.disconnect()
        next_song = None
        return
    next_song = sounds_db.get_next_song()
    next_yt = YouTube(next_song) if next_song else None
    next_file = sub(r'\W+', '', next_yt.title.replace(' ', '_').replace('__', '_')).lower() if next_song else None
    next_song_path = download_videos(next_yt.streams.filter(only_audio=True, file_extension='mp4')[0], next_file) if next_song else None


  


  I've mounted the /media/ dir during docker -v and can see the file is getting downloaded and when I copy the file to my local machine I can play it in an audio player.

  


  The program can access the SQLite database right next to the files in question just fine.

  


  I've deployed the container locally and to two different VPS's with the same file structure with the same behavior. I'm ripping my hair out.

  


• ffmpeg framemd5 errors with FFV1.mkv in Windows

  19 août 2022, par jim_e_jib

  I'm using framemd5 to check lossless transcoding to FFV1.mkv and am getting mismatches between my source and FFV1 files.

  


  If I generate the framemd5 files in Windows, I get presentation timestamp mismatches on the audio between the source file and FFV1. The MD5s themselves match.

  


  If I generate the framemd5 files for the FFV1 in Linux (WSL), everything matches just fine.

  


  Is there something I am doing wrong, or is this just a quirk of the ffmpeg/FFV1/Windows combination ?

  


  I am using ffmpeg version 2022-07-14-git-882aac99d2-full_build-www.gyan.dev in Windows and
ffmpeg version 4.4.2-0ubuntu1 20.04.sav2 in WSL.

  


  Many thanks !

  


  Jim