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• Start of video is not labeled as "0" in QuickTime Video from GoPro

  26 mars 2020, par John Terragnoli

  I’m trying to combine four GoPro videos into a single video, and then rotate it 90 degrees. However, the time scales on the bottom of the videos are all wrong. The videos are 17 minutes and 42 second. But the beginning time is labeled as 5:15:20:32 and the ending time is 5:33:01:32. It just looks really weird and I’d like to fix it. After I use ffmpeg to rotate and concatenate the videos, the problem persists. Could it possibly be fixed with Exiftool ?

  ffmpeg -safe 0 -f concat -i list.txt -vcodec copy -acodec copy merged_videos.MP4

  ffmpeg -i input.mov -vf "transpose=1" output.mov

  Here is the exiftool information on one of the videos :

  File Name                       : GOPR3023.MP4
  
  Directory                       : .
  
  File Size                       : 3.7 GB
  
  File Modification Date/Time     : 2018:04:12 14:56:16-05:00
  
  File Access Date/Time           : 2020:03:25 12:17:18-05:00
  
  File Inode Change Date/Time     : 2020:03:25 17:57:04-05:00
  
  File Permissions                : rwxrwxrwx
  
  File Type                       : MP4
  
  File Type Extension             : mp4
  
  MIME Type                       : video/mp4
  
  Major Brand                     : MP4 v1 [ISO 14496-1:ch13]
  
  Minor Version                   : 2013.10.18
  
  Compatible Brands               : mp41
  
  Movie Data Size                 : 4001979951
  
  Movie Data Offset               : 28
  
  Movie Header Version            : 0
  
  Create Date                     : 2018:04:12 14:38:32
  
  Modify Date                     : 2018:04:12 14:38:32
  
  Time Scale                      : 60000
  
  Duration                        : 0:17:42
  
  Preferred Rate                  : 1
  
  Preferred Volume                : 100.00%
  
  Preview Time                    : 0 s
  
  Preview Duration                : 0 s
  
  Poster Time                     : 0 s
  
  Selection Time                  : 0 s
  
  Selection Duration              : 0 s
  
  Current Time                    : 0 s
  
  Next Track ID                   : 6
  
  Firmware Version                : HD5.03.02.51.00
  
  Lens Serial Number              : NAH6092300301117
  
  Camera Serial Number Hash       : 34676f2cdf49b86a1514817a93377bf7
  
  Track Header Version            : 0
  
  Track Create Date               : 2018:04:12 14:38:32
  
  Track Modify Date               : 2018:04:12 14:38:32
  
  Track ID                        : 1
  
  Track Duration                  : 0:17:42
  
  Track Layer                     : 0
  
  Track Volume                    : 0.00%
  
  Image Width                     : 1920
  
  Image Height                    : 1080
  
  Graphics Mode                   : srcCopy
  
  Op Color                        : 0 0 0
  
  Compressor ID                   : avc1
  
  Source Image Width              : 1920
  
  Source Image Height             : 1080
  
  X Resolution                    : 72
  
  Y Resolution                    : 72
  
  Compressor Name                 : GoPro AVC encoder
  
  Bit Depth                       : 24
  
  Color Representation            : nclx 1 1 1
  
  Video Frame Rate                : 59.94
  
  Time Code                       : 3
  
  Balance                         : 0
  
  Audio Format                    : mp4a
  
  Audio Channels                  : 2
  
  Audio Bits Per Sample           : 16
  
  Audio Sample Rate               : 48000
  
  Text Font                       : Unknown (21)
  
  Text Face                       : Plain
  
  Text Size                       : 10
  
  Text Color                      : 0 0 0
  
  Background Color                : 65535 65535 65535
  
  Font Name                       : Helvetica
  
  Other Format                    : tmcd
  
  Warning                         : [minor] The ExtractEmbedded option may find more tags in the movie data
  
  Matrix Structure                : 1 0 0 0 1 0 0 0 1
  
  Media Header Version            : 0
  
  Media Create Date               : 2018:04:12 14:38:32
  
  Media Modify Date               : 2018:04:12 14:38:32
  
  Media Time Scale                : 60000
  
  Media Duration                  : 0:17:42
  
  Handler Class                   : Media Handler
  
  Handler Type                    : NRT Metadata
  
  Handler Description             : GoPro SOS
  
  Gen Media Version               : 0
  
  Gen Flags                       : 0 0 0
  
  Gen Graphics Mode               : srcCopy
  
  Gen Op Color                    : 0 0 0
  
  Gen Balance                     : 0
  
  Meta Format                     : fdsc
  
  Image Size                      : 1920x1080
  
  Megapixels                      : 2.1
  
  Avg Bitrate                     : 30.1 Mbps
  
  Rotation                        : 0

  Part 2
  There is a pretty obvious "stutter" at the 17:42 mark where the two clips are combined. I’ve tried using ffmpeg and iMovie, but both give the same results. The GoPro broke up the event into multiple clips on it’s own so it seems weird that there would be any information missing. Is there any way to get rid of this stutter ?

  Thanks !

• How to HLS-live-stream incoming batches of individual frames, "appending" to a m3u8 playlist in real time, with ffmpeg ?

  20 novembre 2024, par Rob

  My overall goal :

  



  Server-side :

  



  

  • I have batches of sequential, JPEG-encoded frames (8-16) arriving from time to time, generated at roughly 2 FPS.

  


  • I would like to host an HLS live stream, where, when a new batch of frames arrives, I encode those new frames as h264 .ts segments with ffmpeg, and have the new .ts segments automatically added to an HLS stream (e.g. .m3u8 file).

  


  



  Client/browser-side :

  



  

  • When the .m3u8 is updated, I would like the video stream being watched to simply "continue", advancing from the point where new .ts segments have been added.

  


  • I do not need the user to scrub backwards in time, the client just needs to support live observation of the stream.

  


  



  



  My current approach :

  



  Server-side :

  



  To generate the "first" few segments of the stream, I'm attempting the below (just command-line for now to get ffmpeg working right, but ultimately will be automated via a Python script) :

  



  For reference, I'm using ffmpeg version 3.4.6-0ubuntu0.18.04.1.

  



  ffmpeg -y -framerate 2 -i /frames/batch1/frame_%d.jpg \
       -c:v libx264 -crf 21 -preset veryfast -g 2 \
       -f hls -hls_time 4 -hls_list_size 4 -segment_wrap 4 -segment_list_flags +live video/stream.m3u8


  



  where the /frames/batch1/ folder contains a sequence of frames (e.g. frame_01.jpg, frame_02.jpg, etc...). This already doesn't appear to work correctly, because it keeps adding #EXT-X-ENDLIST to the end of the .m3u8 file, which as I understand is not correct for a live HLS stream - here's what that generates :

  



  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:4.000000,
stream0.ts
#EXTINF:4.000000,
stream1.ts
#EXTINF:2.000000,
stream2.ts
#EXT-X-ENDLIST


  



  I can't figure out how to suppress #EXT-X-ENDLIST here - this is problem #1.

  



  Then, to generate subsequent segments (e.g. when new frames become available), I'm trying this :

  



  ffmpeg -y -framerate 2 -start_number 20 -i /frames/batch2/frame_%d.jpg \
       -c:v libx264 -crf 21 -preset veryfast -g 2 \
       -f hls -hls_time 4 -hls_list_size 4 -segment_wrap 4 -segment_list_flags +live video/stream.m3u8


  



  Unfortunately, this does not work the way I want it to. It simply overwrites stream.m3u8, does and does not advance #EXT-X-MEDIA-SEQUENCE, it does not index the new .ts files correctly, and it also includes the undesirable #EXT-X-ENDLIST - this is the output of that command :

  



  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:4.000000,
stream0.ts
#EXTINF:4.000000,
stream1.ts
#EXTINF:3.000000,
stream2.ts
#EXT-X-ENDLIST


  



  Fundamentally, I can't figure out how to "append" to an existing .m3u8 in a way that makes sense for HLS live streaming. That's essentially problem #2.

  



  For hosting the stream, I'm using a simple Flask app - which appears to be working the way I intend - here's what I'm doing for reference :

  



  @app.route('/video/')
def stream(file_name):
    video_dir = './video'
    return send_from_directory(directory=video_dir, filename=file_name)


  



  Client-side :

  



  I'm trying HLS.js in Chrome - basically boils down to this :

  



  <video></video>&#xA;&#xA;...&#xA;&#xA;<code class="echappe-js">&lt;script src=&quot;https://cdn.jsdelivr.net/npm/hls.js@latest&quot;&gt;&lt;/script&gt;&#xA;&lt;script&gt;&amp;#xA;   var video = document.getElementById(&amp;#x27;video1&amp;#x27;);&amp;#xA;   if (Hls.isSupported()) {&amp;#xA;     var hls = new Hls();&amp;#xA;     hls.loadSource(&amp;#x27;/video/stream.m3u8&amp;#x27;);&amp;#xA;     hls.attachMedia(video);&amp;#xA;     hls.on(Hls.Events.MANIFEST_PARSED, function() {&amp;#xA;       video.play();&amp;#xA;     });&amp;#xA;   }&amp;#xA;   else if (video.canPlayType(&amp;#x27;application/vnd.apple.mpegurl&amp;#x27;)) {&amp;#xA;     video.src = &amp;#x27;/video/stream.m3u8&amp;#x27;;&amp;#xA;     video.addEventListener(&amp;#x27;loadedmetadata&amp;#x27;, function() {&amp;#xA;       video.play();&amp;#xA;     });&amp;#xA;   }&amp;#xA;&lt;/script&gt;   &#xA;

  



  I'd like to think that what I'm trying to do doesn't require a more complex approach than what I'm trying above, but since what I'm trying to far definitely isn't working, I'm starting to think I need to come at this from a different angle. Any ideas on what I'm missing ?

  



  Edit :

  



  I've also attempted the same (again in Chrome) with video.js, and am seeing similar behavior - in particular, when I manually update the backing stream.m3u8 (with no #EXT-X-ENDLIST tag), videojs never picks up the new changes to the live stream, and just buffers/hangs indefinitely.

  



  <video class="video-js vjs-default-skin" muted="muted" controls="controls">&#xA;    <source type="application/x-mpegURL" src="/video/stream.m3u8">&#xA;</source></video>&#xA;&#xA;...&#xA;&#xA;<code class="echappe-js">&lt;script&gt;&amp;#xA;    var player = videojs(&amp;#x27;video1&amp;#x27;);&amp;#xA;    player.play();&amp;#xA;&lt;/script&gt;&#xA;

  



  For example, if I start with this initial version of stream.m3u8 :

  



  #EXTM3U
#EXT-X-PLAYLIST-TYPE:EVENT
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:8
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:4.000000,
stream0.ts
#EXTINF:4.000000,
stream1.ts
#EXTINF:2.000000,
stream2.ts


  



  and then manually update it server-side to this :

  



  #EXTM3U
#EXT-X-PLAYLIST-TYPE:EVENT
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:8
#EXT-X-MEDIA-SEQUENCE:3
#EXTINF:4.000000,
stream3.ts
#EXTINF:4.000000,
stream4.ts
#EXTINF:3.000000,
stream5.ts


  



  the video.js control just buffers indefinitely after only playing the first 3 segments (stream*.ts 0-2), which isn't what I'd expect to happen (I'd expect it to continue playing stream*.ts 3-5 once stream.m3u8 is updated and video.js makes a request for the latest version of the playlist).

  


• Discord.js "Error : FFMPEG not found" but I'm pretty sure I have it

  21 février 2020, par Cole Perry

  I’m learning Discord.js and following this tutorial : https://discord.js.org/#/docs/main/stable/topics/voice . From the start, when I try to run- npm install ffmpeg-binaries I get a huge error message but it tells me to just use install ffmpeg so I did.

  Here is my Index.js page(I’ve replaced my token with * here) :

  const Discord = require('discord.js');
  
  const Colesbot = new Discord.Client();
  
  
  
  const token = '**********************************';
  
  
  
  Colesbot.on('ready', () =>{
  
      console.log('Slamsbot is online.');
  
  })
  
  
  
  Colesbot.on('message', msg=>{
  
     if(msg.content == "What up bot?"){
  
         msg.reply("Whats good pimp?")
  
     }
  
  });
  
  
  
  Colesbot.on('message', message=>{
  
      if (message.content === '/join') {
  
          // Only try to join the sender's voice channel if they are in one themselves
  
          if (message.member.voiceChannel) {
  
              message.member.voiceChannel.join().then(connection => {
  
                  message.reply('I have successfully connected to the channel!');
  
              }).catch(console.log);
  
      } else {
  
          message.reply('You need to join a voice channel first!');
  
        }
  
      }
  
   });
  
  
  
  //Event listener for new guild members
  
  Colesbot.on('guildMemberAdd', member =>{
  
      // Send the message to a designated channel on a server:
  
      const channel = member.guild.channels.find(ch => ch.name === 'general');
  
      // Do nothing if the channel wasn't found on this server
  
      if (!channel) return;
  
      // Send the message, mentioning the member
  
      channel.send(`Welcome to the server, ${member}. Please use the bot-commands channel to assign yourself a role.`);
  
  })
  
  
  
  Colesbot.login(token);
  
  
  
  
  
  
  
  exports.run = (client, message, args) => {
  
  
  
      let user = message.mentions.users.first || message.author;
  
  
  
  
  
  }

  If I type "/join" while not connected to a voice channel I get the proper message. However, if I try while I am I get this error message :

  Error: FFMPEG not found
  
  task_queues.js:94
  
  message:"FFMPEG not found"
  
  stack:"Error: FFMPEG not found\n    at Function.selectFfmpegCommand (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\transcoders\ffmpeg\Ffmpeg.js:46:13)\n    at new FfmpegTranscoder (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\transcoders\ffmpeg\Ffmpeg.js:7:37)\n    at new MediaTranscoder (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\transcoders\MediaTranscoder.js:10:19)\n    at new Prism (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\Prism.js:5:23)\n    at new VoiceConnection (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\discord.js\src\client\voice\VoiceConnection.js:46:18)\n    at c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\discord.js\src\client\voice\ClientVoiceManager.js:63:22\n    at new Promise (<anonymous>)\n    at ClientVoiceManager.joinChannel (c:\Users\bobal\Documents\GitHub\Spotif...
  
  </anonymous>

  So I went to that folder and the file Ffmpeg.js is there and here is its contents :

  const ChildProcess = require('child_process');
  
  const FfmpegProcess = require('./FfmpegProcess');
  
  
  
  class FfmpegTranscoder {
  
    constructor(mediaTranscoder) {
  
      this.mediaTranscoder = mediaTranscoder;
  
      this.command = FfmpegTranscoder.selectFfmpegCommand();
  
      this.processes = [];
  
    }
  
  
  
    static verifyOptions(options) {
  
      if (!options) throw new Error('Options not provided!');
  
      if (!options.media) throw new Error('Media must be provided');
  
      if (!options.ffmpegArguments || !(options.ffmpegArguments instanceof Array)) {
  
        throw new Error('FFMPEG Arguments must be an array');
  
      }
  
      if (options.ffmpegArguments.includes('-i')) return options;
  
      if (typeof options.media === 'string') {
  
        options.ffmpegArguments = ['-i', `${options.media}`].concat(options.ffmpegArguments).concat(['pipe:1']);
  
      } else {
  
        options.ffmpegArguments = ['-i', '-'].concat(options.ffmpegArguments).concat(['pipe:1']);
  
      }
  
      return options;
  
    }
  
  
  
    /**
  
     * Transcodes an input using FFMPEG
  
     * @param {FfmpegTranscoderOptions} options the options to use
  
     * @returns {FfmpegProcess} the created FFMPEG process
  
     * @throws {FFMPEGOptionsError}
  
     */
  
    transcode(options) {
  
      if (!this.command) this.command = FfmpegTranscoder.selectFfmpegCommand();
  
      const proc = new FfmpegProcess(this, FfmpegTranscoder.verifyOptions(options));
  
      this.processes.push(proc);
  
      return proc;
  
    }
  
  
  
    static selectFfmpegCommand() {
  
      try {
  
        return require('ffmpeg-binaries');
  
      } catch (err) {
  
        for (const command of ['ffmpeg', 'avconv', './ffmpeg', './avconv']) {
  
          if (!ChildProcess.spawnSync(command, ['-h']).error) return command;
  
        }
  
        throw new Error('FFMPEG not found');
  
      }
  
    }
  
  }
  
  
  
  module.exports = FfmpegTranscoder;

  I also added ffmpeg to system path and it didn’t help :

  C:\ffmpeg
  
  C:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\ffmpeg

  I’m not quite sure what to do from here. If you need any other info I’d be glad to give it.