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• "Cannot read property 'url' of undefined" even though it's already defined

  28 novembre 2020, par Levi Stancz

  I'm making a Discord music Bot and I'm having trouble with an error saying

  


  TypeError: Cannot read property 'url' of undefined


  


  I tried console logging it and it showed me the url, so I don't understand what is the problem with my code.

  


  Here's my code :

  


  //musicBOT
const Discord = require('discord.js');
const client = new Discord.Client();
const ytdl = require('ytdl-core');
const mcPrefix = '.';

const queue = new Map();

client.on('ready', () => console.log('Music bot ready!'));

client.on('message', async message => {
    if(message.author.bot) return;
    if(!message.content.startsWith(mcPrefix)) return;

    const args = message.content.substring(mcPrefix.length).split(" ");
    const serverQueue = queue.get(message.guild.id);

    if(message.content.startsWith(`${mcPrefix}play`)) {

        const voiceChannel = message.member.voice.channel;
        if(!voiceChannel) return message.channel.send("Hang-szobában kell lenned zenelejátszáshoz.");
        const permissions = voiceChannel.permissionsFor(message.client.user);
        if(!permissions.has('CONNECT')) return message.channel.send("Nincs jogosultságom csatlakozni a hangszobához.");
        if(!permissions.has('SPEAK')) return message.channel.send("Nincs jogosultságom megszólalni ebben a hangszobában.");

        const songInfo = await ytdl.getInfo(args[1])
        const song = {
            title: songInfo.title,
            url: songInfo.videoDetails.video_url
        }

        if(!serverQueue) {
            const queueConstruct = {
                textChannel: message.channel,
                voiceChannel: voiceChannel,
                connection: null,
                songs: [],
                volume: 5,
                playing: true
            }
            queue.set(message.guild.id, queueConstruct)

            queueConstruct.songs.push(song)

            try{
                var connection = await voiceChannel.join();
                message.channel.send(`${song.title} lejátszása.`)
                queueConstruct.connection = connection
                play(message.guild, queueConstruct.songs[0])
            }catch(e){
                console.log(`Hiba csatlakozás közben itt: ${e}`);
                queue.delete(message.guild.id)
                return message.channel.send(`Hiba volt a csatlakozás közben itt: ${e}`)
            }
        } else{
            serverQueue.songs.push(song)
            return message.channel.send(`**${song.title}** hozzáadva a lejátszási listához.`)
        }
        return undefined
        

        
    }else if (message.content.startsWith(`${mcPrefix}stop`)) {
        if(!message.member.voice.channel) return message.channel.send("Hang-szobában kell lenned ahhoz, hogy leállítsd a zenét.")
        if(!serverQueue) return message.channel.send("There is nothing playing")
        serverQueue.songs= []
        serverQueue.connection.dispatcher.end()
        message.channel.send("Sikeresen megálltottad a zenét.")
        return undefined
    }else if(message.content.startsWith(`${mcPrefix}skip`)){
        if(!message.member.voice.channel) return message.channel.send("Hang-szobában kell lenned a skip parancshoz.")
        if(!serverQueue) return message.channel.send("There is nothing playing")
        serverQueue.connection.dispatcher.end()
        message.channel.send("Zene továbbléptetve.")
        message.channel.send(`${song.title} játszása.`)
        
        return undefined
    }

    function play(guild, song) {
        const serverQueue = queue.get(guild.id)
    
        if(!serverQueue.songs){
            serverQueue.voiceChannel.leave()
            queue.delete(guild.id)
            return
        }
    
        const dispatcher = serverQueue.connection.play(ytdl(song.url))
            .on('finish', () => {
                serverQueue.songs.shift()
                play(guild, serverQueue.songs[0])
            })
            .on('error', error => {
                console.log(error)
            })
            dispatcher.setVolumeLogarithmic(serverQueue.volume / 5)
    }

})
//musicBOT


  


  and here is the full error :

  


  const dispatcher = serverQueue.connection.play(ytdl(songInfo.url))&#xA;                                                                     ^&#xA;TypeError: Cannot read property &#x27;url&#x27; of undefined&#xA;    at play (C:\Users\Levi\Desktop\Discord BOT Javascript\bot.js:97:70)&#xA;    at StreamDispatcher.<anonymous> (C:\Users\Levi\Desktop\Discord BOT Javascript\bot.js:100:17)&#xA;    at StreamDispatcher.emit (node:events:388:22)&#xA;    at finish (node:internal/streams/writable:734:10)&#xA;    at processTicksAndRejections (node:internal/process/task_queues:80:21)&#xA;</anonymous>

  


  I started searching on the internet but found nothing about it, I guess my basic javascript knowledge is just not enough.

  


• Convert a YUVJ422 and YUVJ420 frame into YV12 in C++ with FFmpeg

  22 janvier 2024, par Can

  I am currently writing a program, to convert YUVJ422 and YUVJ420 frames into YV12. The YV12 frame is then uploaded to the GPU and there converted into RGB again, but that part should work fine (more on that later).

  


  1080p and 720p are working very good and performant (no delays or anything) already with my program, but 540p has a weird artifact in the bottom of the frame (8 pixels are green ish, but also kind of transparent, so copying the information about the brightness worked but the U and/or ? V plane seem to be missing something at the end.

  


  My thoughts are, that maybe because 540 is not even when dividing with 8, the copy operation misses somehting ? Also could be some padding that is not considered ? So I tried to hard-code the height to 544, before decoding and providing a height of 544 to the FFmpeg decoder, but that didn't work either and resulted in a similar output.

  


  Another reason for the green line could be, that the shader does not take any padding into account, the height provided into the shader is 540, but I am not quite sure, if the shader is the problem, as it works for the other formats and a green line seems to indicate more, that not enough data was copied, as green lines usually mean zeroed memory, as a zero would translate to green in YUV.

  


  I am now out of ideas, why the code fails for 540p formats, so I hope that someone already had this issue before maybe and provide some clarification, here is my code to convert the pixel data, keep in mind that the code is not fully optimized yet and I already planned to write shaders to convert from the YUVJ420 and YUVJ422 formats directly into RGBA as that would be much faster, but for now I have to take this "workaround" to convert the data first to YV12 for other reasons.

  


          if (mCurrentFrame->format == AV_PIX_FMT_YUVJ420P)
        {
            if (540 == mCurrentFrame->height)
            {
                int uvHeight = mCurrentFrame->height / 2;
                int offset   = 0;

                // Copy Y plane
                for (int y = 0; y < mCurrentFrame->height; ++y)
                {
                    memcpy(decodedFrame->GetData() + offset, mCurrentFrame->data[0] + mCurrentFrame->linesize[0] * y, mCurrentFrame->width);
                    offset += mCurrentFrame->width;
                }

                // Copy V plane
                for (int v = 0; v < uvHeight; ++v)
                {
                    memcpy(decodedFrame->GetData() + offset, mCurrentFrame->data[2] + mCurrentFrame->linesize[2] * v, mCurrentFrame->width / 2);
                    offset += mCurrentFrame->width / 2;
                }

                // Copy U plane
                for (int u = 0; u < uvHeight; ++u)
                {
                    memcpy(decodedFrame->GetData() + offset, mCurrentFrame->data[1] + mCurrentFrame->linesize[1] * u, mCurrentFrame->width / 2);
                    offset += mCurrentFrame->width / 2;
                }
            }
            else
            {
                int ySize  = mCurrentFrame->width * mCurrentFrame->height;
                int uvSize = (mCurrentFrame->width / 2) * (mCurrentFrame->height / 2);

                // Copy Y plane
                memcpy(decodedFrame->GetData(), mCurrentFrame->data[0], ySize);

                // Copy V plane
                memcpy(decodedFrame->GetData() + ySize, mCurrentFrame->data[2], uvSize);

                // Copy U plane
                memcpy(decodedFrame->GetData() + ySize + uvSize, mCurrentFrame->data[1], uvSize);
            }
        }
        else if (mCurrentFrame->format == AV_PIX_FMT_YUVJ422P)
        {
            int offset = 0;

            if (540 == mCurrentFrame->height)
            {
                // Copy Y plane, but linewise
                for (int y = 0; y < mCurrentFrame->height; ++y)
                {
                    memcpy(decodedFrame->GetData() + offset, mCurrentFrame->data[0] + mCurrentFrame->linesize[0] * y, mCurrentFrame->width);
                    offset += mCurrentFrame->width;
                }
            }
            else
            {
                int ySize = mCurrentFrame->width * mCurrentFrame->height;
                offset    = ySize;

                // Copy Y plane
                memcpy(decodedFrame->GetData(), mCurrentFrame->data[0], ySize);
            }

            // Copy V plane, but linewise
            for (int v = 0; v < mCurrentFrame->height; v += 2)
            {
                memcpy(decodedFrame->GetData() + offset, mCurrentFrame->data[2] + mCurrentFrame->linesize[2] * v, mCurrentFrame->width / 2);
                offset += mCurrentFrame->width / 2;
            }

            // Copy U plane, but linewise
            for (int u = 0; u < mCurrentFrame->height; u += 2)
            {
                memcpy(decodedFrame->GetData() + offset, mCurrentFrame->data[1] + mCurrentFrame->linesize[1] * u, mCurrentFrame->width / 2);
                offset += mCurrentFrame->width / 2;
            }
        }


  


  mCurrentFrame is the normal AVFrame structure from FFmpeg.

  


  I still think it might be a padding issue, but any help would be much appreciated !

  


• FFMPEG does not add images to audio

  20 février 2018, par Googlebot

  I want to create a slideshow with a background music by ffmpeg, and use the command

  ffmpeg -f concat -safe 0 -i map.txt -i audio.flac -vsync vfr -pix_fmt yuv420p -strict -2 video.mp4

  and map.txt is like

  file '1.jpg'
  
  duration 15
  
  file '2.jpg'
  
  duration 60

  The result is a video with the audio and blank background. If I run the above command without audio as

  ffmpeg -f concat -safe 0 -i map.txt -pix_fmt yuv420p -strict -2 video.mp4

  a perfect video of the images (the intended slideshow) is generated (but obviously without audio).

  I reckon the problem is related to synchronising the audio and images.

  This is the terminal output for the first command

  ffmpeg -f concat -safe 0 -i map.txt -i audio.flac -vsync vfr -pix_fmt yuv420p -strict -2 video.mp4
  
  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mjpeg @ 0x1cc8d40] Changeing bps to 8
  
  Input #0, concat, from 'map.txt':
  
    Duration: 00:05:48.00, start: 0.000000, bitrate: 0 kb/s
  
      Stream #0:0: Video: mjpeg, gray(bt470bg/unknown/unknown), 1920x1080 [SAR 72:72 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
  
  Input #1, flac, from 'audio.flac':
  
    Metadata:
  
      TITLE           : Speak to Me
  
      ARTIST          : Creator
  
      ALBUM           : Acoustic Hits
  
      track           : 14
  
      GENRE           : Pop
  
      DATE            : 2011
  
    Duration: 00:03:31.02, start: 0.000000, bitrate: 1026 kb/s
  
      Stream #1:0: Audio: flac, 44100 Hz, stereo, s16
  
  [libx264 @ 0x1ccdf80] using SAR=1/1
  
  [libx264 @ 0x1ccdf80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x1ccdf80] profile High, level 4.0
  
  [libx264 @ 0x1ccdf80] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'video.mp4':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 libx264
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp (16 bit), 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.60.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (flac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [mjpeg @ 0x7fe688001ba0] Changeing bps to 8
  
  frame=    2 fps=0.7 q=-1.0 Lsize=    3593kB time=00:03:31.02 bitrate= 139.5kbits/s    
  
  video:147kB audio:3410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.036417%
  
  [libx264 @ 0x1ccdf80] frame I:1     Avg QP: 2.55  size: 33683
  
  [libx264 @ 0x1ccdf80] frame P:1     Avg QP:19.33  size:116022
  
  [libx264 @ 0x1ccdf80] mb I  I16..4: 89.7%  1.1%  9.3%
  
  [libx264 @ 0x1ccdf80] mb P  I16..4:  0.9%  1.8% 30.1%  P16..4:  1.4%  1.5%  0.9%  0.0%  0.0%    skip:63.4%
  
  [libx264 @ 0x1ccdf80] 8x8 transform intra:2.1% inter:15.2%
  
  [libx264 @ 0x1ccdf80] coded y,uvDC,uvAC intra: 19.7% 0.0% 0.0% inter: 2.8% 0.0% 0.0%
  
  [libx264 @ 0x1ccdf80] i16 v,h,dc,p: 97%  2%  2%  0%
  
  [libx264 @ 0x1ccdf80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 12% 39%  1%  1%  2%  1%  2%  4%
  
  [libx264 @ 0x1ccdf80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 16% 16%  3%  4%  6%  5%  5%  4%
  
  [libx264 @ 0x1ccdf80] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0x1ccdf80] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x1ccdf80] kb/s:20.65

  UPDATE (following the comment suggestion)

  ffmpeg -f concat -safe 0 -i map.txt -i audio.flac -vsync vfr -r 5 -pix_fmt yuv420p -strict -2 video.mp4
  
  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mjpeg @ 0x1fe9d80] Changeing bps to 8
  
  Input #0, concat, from 'map.txt':
  
    Duration: 00:02:28.00, start: 0.000000, bitrate: 0 kb/s
  
      Stream #0:0: Video: mjpeg, gray(bt470bg/unknown/unknown), 1920x1080 [SAR 72:72 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
  
  Input #1, flac, from 'audio.flac':
  
    Metadata:
  
      TITLE           : Speak to Me
  
      ARTIST          : Creator
  
      ALBUM           : Acoustic Hits
  
      track           : 14
  
      GENRE           : Pop
  
      DATE            : 2011
  
    Duration: 00:03:31.02, start: 0.000000, bitrate: 1026 kb/s
  
      Stream #1:0: Audio: flac, 44100 Hz, stereo, s16
  
  [libx264 @ 0x1feefc0] using SAR=1/1
  
  [libx264 @ 0x1feefc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x1feefc0] profile High, level 4.0
  
  [libx264 @ 0x1feefc0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'video.mp4':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 5 fps, 10240 tbn, 5 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 libx264
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp (16 bit), 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.60.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (flac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [mjpeg @ 0x7f74cc001ba0] Changeing bps to 8
  
  frame=    2 fps=0.7 q=-1.0 Lsize=    3593kB time=00:03:31.02 bitrate= 139.5kbits/s    
  
  video:147kB audio:3410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.036417%
  
  [libx264 @ 0x1feefc0] frame I:1     Avg QP: 2.55  size: 33683
  
  [libx264 @ 0x1feefc0] frame P:1     Avg QP:19.33  size:116022
  
  [libx264 @ 0x1feefc0] mb I  I16..4: 89.7%  1.1%  9.3%
  
  [libx264 @ 0x1feefc0] mb P  I16..4:  0.9%  1.8% 30.1%  P16..4:  1.4%  1.5%  0.9%  0.0%  0.0%    skip:63.4%
  
  [libx264 @ 0x1feefc0] 8x8 transform intra:2.1% inter:15.2%
  
  [libx264 @ 0x1feefc0] coded y,uvDC,uvAC intra: 19.7% 0.0% 0.0% inter: 2.8% 0.0% 0.0%
  
  [libx264 @ 0x1feefc0] i16 v,h,dc,p: 97%  2%  2%  0%
  
  [libx264 @ 0x1feefc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 12% 39%  1%  1%  2%  1%  2%  4%
  
  [libx264 @ 0x1feefc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 16% 16%  3%  4%  6%  5%  5%  4%
  
  [libx264 @ 0x1feefc0] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0x1feefc0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x1feefc0] kb/s:20.65