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• MPEG Dash output generated by FFMPEG not working

  8 janvier 2019, par Anto Joy

  I created a dash output sample_video.mpd file using ffmpeg, but when I tried to play it using dash js the video was just loading and nothing else.
  Below is the generated mpd file

  <?xml version="1.0" encoding="utf-8"?>
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT1M2.3S" minbuffertime="PT20.0S">
  
  <programinformation>
  
  </programinformation>
  
  <period start="PT0.0S">
  
      <adaptationset contenttype="video" segmentalignment="true" bitstreamswitching="true" lang="und">
  
          <representation mimetype="video/mp4" codecs="avc1.640015" bandwidth="255520" width="426" height="240" framerate="24/1">
  
              <segmenttemplate timescale="12288" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
  
                  <segmenttimeline>
  
                      <s t="198656" d="69120"></s>
  
                      <s d="75264"></s>
  
                      <s d="174592"></s>
  
                      <s d="122880"></s>
  
                      <s d="125440"></s>
  
                  </segmenttimeline>
  
              </segmenttemplate>
  
          </representation>
  
          <representation mimetype="video/mp4" codecs="avc1.64001e" bandwidth="726596" width="854" height="480" framerate="24/1">
  
              <segmenttemplate timescale="12288" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
  
                  <segmenttimeline>
  
                      <s t="198656" d="69120"></s>
  
                      <s d="75264"></s>
  
                      <s d="174592"></s>
  
                      <s d="122880"></s>
  
                      <s d="125440"></s>
  
                  </segmenttimeline>
  
              </segmenttemplate>
  
          </representation>
  
          <representation mimetype="video/mp4" codecs="avc1.64001f" bandwidth="1433314" width="1280" height="720" framerate="24/1">
  
              <segmenttemplate timescale="12288" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
  
                  <segmenttimeline>
  
                      <s t="198656" d="69120"></s>
  
                      <s d="75264"></s>
  
                      <s d="174592"></s>
  
                      <s d="122880"></s>
  
                      <s d="125440"></s>
  
                  </segmenttimeline>
  
              </segmenttemplate>
  
          </representation>
  
      </adaptationset>
  
      <adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true" lang="und">
  
          <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="341000" audiosamplingrate="48000">
  
              <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"></audiochannelconfiguration>
  
              <segmenttemplate timescale="48000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
  
                  <segmenttimeline>
  
                      <s t="772096" d="270336"></s>
  
                      <s d="293888"></s>
  
                      <s d="681984"></s>
  
                      <s d="480256"></s>
  
                      <s d="492544"></s>
  
                  </segmenttimeline>
  
              </segmenttemplate>
  
          </representation>
  
          <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="341000" audiosamplingrate="48000">
  
              <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"></audiochannelconfiguration>
  
              <segmenttemplate timescale="48000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
  
                  <segmenttimeline>
  
                      <s t="772096" d="270336"></s>
  
                      <s d="293888"></s>
  
                      <s d="681984"></s>
  
                      <s d="480256"></s>
  
                      <s d="492544"></s>
  
                  </segmenttimeline>
  
              </segmenttemplate>
  
          </representation>
  
          <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="341000" audiosamplingrate="48000">
  
              <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"></audiochannelconfiguration>
  
              <segmenttemplate timescale="48000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
  
                  <segmenttimeline>
  
                      <s t="772096" d="270336"></s>
  
                      <s d="293888"></s>
  
                      <s d="681984"></s>
  
                      <s d="480256"></s>
  
                      <s d="492544"></s>
  
                  </segmenttimeline>
  
              </segmenttemplate>
  
          </representation>
  
      </adaptationset>
  
  </period>
  
  </mpd>

  The following is the ffmpeg command that i used to generate multi bitrate video

  ffmpeg -y -i sample_video.mp4 ^
  
  -c:v libx264 -x264opts "keyint=24:min-keyint=24:no-scenecut" -r 24 ^
  
  -c:a aac -b:a 128k ^
  
  -bf 1 -b_strategy 0 -sc_threshold 0 -pix_fmt yuv420p ^
  
  -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 ^
  
  -b:v:0 250k  -filter:v:0 "scale=-2:240" -profile:v:0 baseline ^
  
  -b:v:1 750k  -filter:v:1 "scale=-2:480" -profile:v:1 main ^
  
  -b:v:2 1500k -filter:v:2 "scale=-2:720" -profile:v:2 high ^
  
  sample_dash.mp4

  and to generate the mpd file

  ffmpeg -y -re -i sample_dash.mp4 ^
  
  -map 0 ^
  
  -use_timeline 1 -use_template 1 -window_size 5 -adaptation_sets 
  
  "id=0,streams=v id=1,streams=a" ^
  
  -f dash sample_video.mpd

  Also I saw in the chrome network tab that only init-stream4.m4s and init-stream5.m4s was called.

• MovieWriter FFwriter unavailable. Trying to use pillow instead

  17 février 2020, par Life is Good

  I have created a bar chart race in Matplotlib and now I am trying to save it into a gif file. I have imported the relevant library :

  import matplotlib.animation as animation
  
  plt.rcParams['animation.ffmpeg_path'] = '‪C:\\Program Files\\FFmpeg\\bin\\ffmpeg.exe'
  
  FFwriter = animation.FFMpegWriter()

  Here is the code I used to create my animation :

  fig, ax = plt.subplots(figsize=(15, 8))
  
  animator = animation.FuncAnimation(fig, draw_barchart, frames=range(1999, 2015))
  
  HTML(animator.to_jshtml()) 

  However, when I searched for the writers, there are only two of them :

  animation.writers.list()

  

  I had already installed FFmpeg following a tutorial on Wikihow, and I am also able to run FFmpeg from the command line, so I don’t understand why it is not showing up. When I try to save my animation into a gif, I get this error message :
  

  Would anybody be familiar with this error message, please ? Thank you very much.

• Record web browser with sound as a service on linux server with puppeteer

  12 septembre 2021, par NA GUY

  I'm trying to build a service on a linux server to record video a web browser with its sound.

  


  The first step I did with the source code below (using xvfb, puppeteer and ffmpeg) to record successfully.

  


  However when I do a recording with different processes at a same time (different websites) the audio gets mixed up between the processes.
I know this is happening because I used the same default audio output for all processes.

  


  The question is : how can I record the browser with sound that doesn't get mixed up between different processes ?

  


  My sample code below :

  


  var Xvfb = require('xvfb');
var puppeteer = require('puppeteer');
const { spawn, spawnSync } = require('child_process');

async function record() {

    var xvfb = new Xvfb({
        displayNum: 99,
        reuse: false,
        xvfb_args: [
            "-screen", "0", "1920x1080x24",
            "-ac",
            "-nolisten", "tcp",
            "-dpi", "96",
            "+extension", "RANDR"
        ]
    });

    xvfb.startSync();

    var browser = await puppeteer.launch({
        headless: false,
        defaultViewport: null,
        ignoreDefaultArgs: [
            "--mute-audio",
            "--enable-automation"
        ],
        args: [
            "--use-fake-ui-for-media-stream",
            "--window-size=1920,1080",
            "--start-fullscreen"
        ]
    });
    const page = await browser.newPage();

    var url = "http://www.noiseaddicts.com/free-samples-mp3/?id=2544";
    await page.goto(url);
    await page.click('span.map_play');

    var time = new Date().getTime();

    var options = [
        "-video_size", "1920x1080",
        "-framerate", "30",
        "-f", "x11grab",
        "-draw_mouse", "0",
        "-i", ":99",

        "-f", "pulse",
        "-ac", "2",
        "-i", "1",
        "./output" + time + ".mkv"
    ];

    var cmd = 'ffmpeg';

    var proc = spawn(cmd, options);

    proc.stdout.on('data', function (data) {
        console.log(data);
    });

    proc.stderr.setEncoding("utf8")
    proc.stderr.on('data', function (data) {
        console.log(data);
    });

    proc.on('close', async function () {
        console.log('finished');
        xvfb.stopSync();
    });
}

record();