Recherche avancée

Sur d’autres sites (11948)

• Can ffmpeg write metadata encoder when transcoding alac/flac to aac audio file ?

  11 juin 2022, par David I

  I have a collection of alac and flac files from Bandcamp and an ffmpeg instance compiled with libfdk_aac https://trac.ffmpeg.org/wiki/CompilationGuide/Centos#libfdk_aac and am trying to convert these to lossy audio aac files for non-critical listening.

  


  With ffmpeg -i Liholesie\ -\ Shamanic\ Twilight\ -\ 09\ Gray\ Wings.m4a -c:a libfdk_aac -vbr 4 -c:v copy 09_Gray_wings_vbr4.m4a an expected aac .m4a audio file is produced, album art included, works well. There's one slight detail missing :

  


  During the ffmpeg conversion process ffmpeg says :

  


  Output #0, ipod, to '09_Gray_wings_vbr4.m4a':
  Metadata:
    major_brand     : M4A 
    minor_version   : 512
    compatible_brands: M4A isomiso2
    title           : Gray Wings
    artist          : Liholesie
    album_artist    : Liholesie
    album           : Shamanic Twilight
    comment         : Visit https://liholesie.bandcamp.com
    date            : 2021
    track           : 9
    encoder         : Lavf59.24.100
  Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 700x700 [SAR 72:72 DAR 1:1], q=2-31, 90k tbr, 90k tbn (attached pic)
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16 (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.33.100 libfdk_aac 
..




  


  and the file produced looks like that when ffprobed except that the Metadata : encoder field is missing :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '09_Gray_wings_vbr4.m4a':
  Metadata:
    major_brand     : M4A 
    minor_version   : 512
    compatible_brands: M4A isomiso2
    title           : Gray Wings
    artist          : Liholesie
    album_artist    : Liholesie
    album           : Shamanic Twilight
    date            : 2021
    encoder         : Lavf59.24.100
    comment         : Visit https://liholesie.bandcamp.com
    track           : 9
  Duration: 00:06:57.78, start: 0.000000, bitrate: 155 kb/s
  Stream #0:0[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x0]: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 700x700 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn (attached pic)


  


  Is there a way to write the encoder field in the Metadata section when transcoding (or is "encoder" not supported for aac m4a ? That would be weird since ffmpeg says what it says when specifying output during transcoding) .

  


  Any hints on how to write a self-defined text to said tag during transcoding are also welcome.

  


• Discord.py bot joins voice channel but when using voicechannel.play i get error:Command raised an exception : ClientException : Not connected to voice

  25 mai 2023, par AudibleDruid

  So i've managed to get my discord bot to join a voice channel but when i use the play command it gives me an error that its not conencted to voice Command raised an exception: ClientException: Not connected to voice.

  


  Here is my code :

  


  import discord
import random
import glob
from discord.ext import commands

##discord intents 
intents = discord.Intents()
intents.members = True
intents.messages = True
intents.guilds = True
intents.voice_states = True


  


  connect the bot to a voice channel :

  


      
##called when user wants bot to join voice channel
@bot.command(name ='join', help = 'Make the bot join a voice channel')
async def join(context):
    
    botVoice = context.message.guild.voice_client
    if context.guild.voice_client:
        botvoicechannel = context.message.guild.voice_client.channel
    else:
        botvoicechannel = None
    authorVoice = context.author.voice
    if context.author.voice:
        authorvoicechannel = context.author.voice.channel
    else:
        authorvoicechannel = None
    
    ##await context.reply('bot voice channel: {}\n\nbot voice:\n{}\n\nauthor voice channel: {}\n\nauthor voice voice:\n{}\n\n'.format(botvoicechannel, botVoice, authorvoicechannel, authorVoice))
    
    if not authorVoice and not botVoice:
        await context.reply('Connect to a voice channel first.')
        return
    elif authorVoice and not botVoice:
        await context.reply('Connecting to {}'.format(authorvoicechannel))
        await authorvoicechannel.connect()
        return
    elif not authorVoice and botVoice:
        await context.reply("You aren't in a channel, I'm in {}".format(botvoicechannel))
        return
    elif authorVoice and botVoice:
        if (botvoicechannel == authorvoicechannel):
            await context.reply("I'm already in here.")
            return
        else:
            await context.reply('Moving to you!')
            await botVoice.move_to(authorvoicechannel)
            return
        return


  


  and have it play a url :

  


  @bot.command(name ='play', help = 'Make the bot play a url')
async def play(context, url):
    botVoice = context.message.guild.voice_client
    audioSource = discord.FFmpegPCMAudio(url, executable="ffmpeg")
    botVoice.play(audioSource, after = None)


  


  the code works and the bot joins the voice channel. i see it in the voice channel with me, however i get an error when it gets to botVoice.play(audioSource, after = None)

  


  the error message is :
error: Command raised an exception: ClientException: Not connected to voice.

  


  i changed botVoice = context.message.guild.voice_client from botVoice = context.guild.voice_client but that didnt seem to change anything. not sure what to try next. It seems like it wants to play the url the bot just doesnt realize its in the voice channel with me.

  


  maybe a related error. if i kill my python script the bot remains in the channel even though its not running. then when i start it up and do the !join command it says its joining even though its already in the channel with me. its weird because on the join command it checks to see if its already in a voice channel so it should know that its in there with me. idk what to try next. thanks for any suggestions. i only posted relevant code. let me know if you think im missing something else.

  


  thanks for the help

  


• Problem accessing audio track from mp4 file

  20 décembre 2019, par Thomas Spycher

  For a TV Project we want to transcode the source videofiles to other formats. The Sourcefiles are fragmented mp4 files. Destination format could be mp4 or any other format.
  The sourcefile contains multiple audio tracks for different codes (aac, eac3, aac-otherlanguage).

  Something with this files is odd. I can play them without problems on quicktime or VLC. Import them into Premiere for example ends up with the video but without sound.

  Converting them on AWS MediaConvert results in weird issues as well like (depending on the settings) :

  • No audio frames decoded on [selector-(Audio Selector 1)-track-1-drc] (selecting aac audiotrack (Track:1))
  • Decoder : [Dolby decoder error : failed to configure to stream in first 100 frames] (selecting eac3 audiotrack (Track:2) )

  I’m able to convert the files with Handbreak and the result is a MP4 file with one audiotrack which is working everywhere. I’m trying to figure out whats odd with this file to make them working with AWS MediaConvert.

  Here is the ffprobe output of one of the files :

  ffprobe version 4.1 Copyright (c) 2007-2018 the FFmpeg developers
  
    built with Apple LLVM version 10.0.0 (clang-1000.10.44.4)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfreetype --enable-opencl --enable-videotoolbox
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '123893.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomiso2iso5dashavc1dby1mp41
  
    Duration: 00:01:24.02, start: 0.000000, bitrate: 5600 kb/s
  
      Stream #0:0(deu): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 4869 kb/s, 50 fps, 50 tbr, 1k tbn, 100 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(deu): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(deu): Audio: eac3 (ec-3 / 0x332D6365), 48000 Hz, 5.1(side), fltp, 256 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Side data:
  
        audio service type: main

  An example file can get downloaded here : https://wilmaa-rnd.s3-eu-west-1.amazonaws.com/124041.mp4