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• Giving Thanks For VP8

  25 novembre 2010, par Multimedia Mike — VP8

  It’s the Thanksgiving holiday here in the United States. I guess that’s as good a reason as any to release a first cut of my VP8 encoder. In order to remind people that they shouldn’t expect phenomenal quality from it — and to discourage inexperienced people from trying to create useful videos with it — I have hardcoded the quantizers to their maximum settings. For those not skilled in the art, this is the setting that yields maximum compression and worst quality. When compressing the Big Buck Bunny logo image, the resulting file is only 2839 bytes but observe the reconstructed quality :

  
  
  It really just looks like a particularly stormy day in the forest.
  

  First VP8 File From An Independent Encoder
  I found a happy medium on the quantizer scale and encoded the first 30 seconds of Big Buck Bunny for your inspection. I guess this makes it the first VP8/WebM file from an independent encoder (using FFmpeg’s Matroska muxer as well).

  Download : bbb-360p-30sec-q40.webm ( 13 MBytes)

  I think the quality makes it look like it was digitized from an old VHS tape.

  For fun, here’s the version with the quantizer cranked to the max : bbb-360p-30sec-q127.webm ( 1.3 MBytes)

  Aside : I was going to encapsulate the video in this post using a bare HTML5 <video> tag for the benefit of the small browsing population who could view that (indeed, it works fine in Chrome). But that would be insane due to the fact that supporting browsers preload the video with no easy (read : without the help of JavaScript) method for overriding this unacceptable default.

  The Code
  I’m still trying to get over my fear of git. To that end, I have posted the code on Github :

  https://github.com/multimediamike/ffvp8enc

  I still don’t like you, git. But I’m sure we’ll find some way to make this work.

  Other required code changes in the basic FFmpeg tree :

  • Of course, copy vp8enc.c into libavcodec/
  • In libavcodec/allcodecs.c, ’REGISTER_DECODER (VP8, vp8);’ turns into ’REGISTER_ENCDEC (VP8, vp8);’
  • Add ’OBJS-$(CONFIG_VP8_ENCODER) += vp8enc.o’ to libavcodec/Makefile

  Further Work
  About the limitations and work yet to do :

  • it’s still intra-only, no interframes (which is where a lot of compression occurs)
  • no rate control or distortion optimization, obviously
  • no intra 4x4 coding (that’s close to working but didn’t my little T-day deadline)
  • no quantization control ; this should really be hooked up to the FFmpeg command line but I’m not sure how
  • encoder writes into a static-sized, 1/2 MB memory buffer ; this can overflow
  • code is a mess (what did you expect at this stage of the game ?)
  • lots and lots of other things, surely

• New Matomo Mobile 2.4.0 released

  12 janvier 2018, par Matomo Core Team

  New Matomo Mobile 2.4.0 update is now available for Android 6+ and iOS10.3+ devices. This is the first mobile release that shows signs of the new Matomo branding instead of Piwik. Don’t be surprised if the app still shows the Piwik app icon. This is on purpose as the name of the app changed to Matomo Mobile and some users would otherwise not find the app anymore if they haven’t heard of the renaming from Piwik to Matomo before.

  What’s new in Matomo Mobile ?

  This new version brings some bug fixes and improvements to our Android and iOS apps :

  • Piwik is now Matomo which includes some name changes in the app as well as showing the new logo
  • Fixed broken “Get-involved” link
  • Links to Matomo or other websites now open in the browser app and no longer in the app itself
  • Improved visitor log to support more actions (see #12284)
  • We have updated the underlying framework bringing some performance and compatibility improvements

  Download the Apps

  Update now or install either the iOS version or the Android version. Android users can also download the latest version from our website : download Matomo Mobile 2.4.0 from our website.

  If you experience any issues with this version please let us know.

  Sponsor

  The new Matomo Mobile release has been sponsored by InnoCraft, the creators of Matomo.

  

  Happy analytics on the go,

  The post New Matomo Mobile 2.4.0 released appeared first on Analytics Platform - Matomo.

• 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.

  &#xA;

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

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

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

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  My sample code below :

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  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();


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