Advanced search

On other websites (10559)

• Convert mp3 to AAC with mpeg-2 container (FFMPEG)

  18 March 2016, by jsurf

  I’m trying to convert an mp3 audio file to an AAC file with FFMPEG, and I need the audio to be wrapped in an MPEG-2 container.
  The resulting AAC file needs to be AAC-LC (Low Complexity), 1-channel, CBR mode, 44100 sample rate, and 48kb/s bitrate, so I use this command:

  ffmpeg -y -i input.mp3 -ar 44100 -ab 48k -acodec libfdk_aac -ac 1 output.aac

  But when I examine the ADTS headers, the audio file is always being wrapped in an MPEG-4 container. I have tried all the codecs listed here but I still end up with an mpeg-4 container wrapped around the audio: http://trac.ffmpeg.org/wiki/AACEncodingGuide.

  Here are the headers I get when examining the AAC output file:

  mpeg_type: ’MPEG4’,
  profile: 2,
  profile_name: ’AAC LC’,
  sample_freq: 44100,
  channel_config: 1,
  channels: 1,
  frame_length: 139,
  buffer_fullness: 157,
  number_of_frames: 1,
  frames_per_sec: 43.06640625

  Any ideas as to why ffmpeg wraps an mp4 container around the audio? Can I get around this somehow? Are there any other encoders I can try aside from FFMPEG? I was giving FAAC encoder a shot and it gives me the proper encoding and ADTS headers, but alas it does not support mp3, only WAV.

• fftools/ffmpeg_mux_init: change 1-bit bitfields from int to unsigned

  14 December 2023, by Anton Khirnov

  fftools/ffmpeg_mux_init: change 1-bit bitfields from int to unsigned
  They cannot store 1 as signed, only 0 and -1.
  Avoids warnings such as:
  
    implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
  

  • [DH] fftools/ffmpeg_mux_init.c

• How can I merge discord voice streams?

  3 March 2023, by LeGlaude

  I'd like to merge the voice of users that I receive using the discordjs/voice library. The number of streams to merge has to be flexible. Also, The output stream has to be readable so I can use it as a source.

  


  I tried different libraries like fluent-ffmpeg, ffmpeg and merge-stream. My discord bot didn't crash when I was using fluent-ffmpeg to merge n streams but no sound was streamed. Sadly, I don't have my previous code when I used fluent-ffmpeg. I have my code that uses merge-stream. The problem with merge-stream is that when I try to merge streams it says "TypeError: source.once is not a function". Here is my code :

  


  async function CreateStream(server_id) {
    let users = client.channels.cache.get(GetVoiceChannel(server_id)).members.map(user => user.id)
    if (users.indexOf(bot_id) != -1) {
        users.splice(users.indexOf(bot_id), bot_id)
    };

    console.log(users)

    const connection1 = getVoiceConnection(server_id)
    const connection2 = getVoiceConnection(GetCall(server_id))

    const streams = []

    for (const user in users) {
        const sub = connection1.receiver.subscribe(user, { end: EndBehaviorType.Manual })
        streams.push(sub)
    }

    const theStream = merge()

    for (const stream in streams) {
        theStream.add(stream)
    }

    const resource = createAudioResource(theStream, {inputType: StreamType.Opus})
    const player = createAudioPlayer()

    connection2.subscribe(player);
    player.play(resource);
    
}


  


  EDIT :

  


  Now this is my code :

  


  
async function CreateStream(server_id) {
    let users = client.channels.cache.get(GetVoiceChannel(server_id)).members.map(user => user.id)
    if (users.indexOf(bot_id) != -1) {
        users.splice(users.indexOf(bot_id), bot_id)
    };

    const connection1 = getVoiceConnection(server_id)
    const connection2 = getVoiceConnection(GetCall(server_id))

    let merge_param = []

    for (const user in users) {
        const sub = connection1.receiver.subscribe(user, { end: EndBehaviorType.Manual })
        merge_param.push('-i')
        merge_param.push(sub)
    }

    merge_param.push('-','-sample_fmt', 's16', '-ar', '48000','-ac', 2, '-acodec', 'libopus','-b:a', '192k', '-vbr', 'on', '-compression_level', '10', '-f', 'opus', 'pipe:1')

    const ffmpeg = cp.spawn('ffmpeg', merge_param);

    const resource = createAudioResource(ffmpeg.stdout, {inputType: StreamType.Opus})
    const player = createAudioPlayer()

    connection2.subscribe(player);
    player.play(resource);
    
}



  


  I don't have an error anymore but no sound is coming out from the bot.