Recherche avancée

Sur d’autres sites (4368)

• ffmpeg wasm - how to take client-side created mp4 and upload it to the same server hosting the index/js files being used

  29 juillet 2022, par John Farrell

  Ok, so Im an IT guy and kind of a noob on the dev side of the fence. But I've been able to create this ffmpeg wasm page that takes a canvas and converts it to webm / and .mp4 — what i WANT to do is take the resulting .mp4 file and upload it to the server where the page/js are being served from. is this possible ? I will include my source code which is fairly simple and straight forward, I just don't know how to manipulate the resulting mp4 file that ffmpeg spits out (i realize it is happening client side) to be able to push it up to the server (maybe with aupload.php type situation ?) the solution can be html/java/php whatever, so long as it takes the mp4 output and gets it onto the server. I'd VERY MUCH appreciate a hand here.

  


  Going to try my best to properly insert the html and js. please bear with me if i've done something wrong, i've never had to -ask- a question on here, usually just look up existing answers.

  


  


  


  const { createFFmpeg } = FFmpeg;
const ffmpeg = createFFmpeg({
  log: true
});

const transcode = async (webcamData) => {
  const message = document.getElementById('message');
  const name = 'record.webm';
  await ffmpeg.load();
  message.innerHTML = 'Start transcoding';
  await ffmpeg.write(name, webcamData);
  await ffmpeg.transcode(name,  'output.mp4');
  message.innerHTML = 'Complete transcoding';
  const data = ffmpeg.read('output.mp4');

  const video = document.getElementById('output-video');
  video.src = URL.createObjectURL(new Blob([data.buffer], { type: 'video/mp4' }));
  dl.href = video.src;
  dl.innerHTML = "download mp4"
}

fn().then(async ({url, blob})=>{
    transcode(new Uint8Array(await (blob).arrayBuffer()));
})

function fn() {
var recordedChunks = [];

var time = 0;
var canvas = document.getElementById("canvas");

return new Promise(function (res, rej) {
    var stream = canvas.captureStream(60);

    mediaRecorder = new MediaRecorder(stream, {
        mimeType: "video/webm; codecs=vp9"
    });

    mediaRecorder.start(time);

    mediaRecorder.ondataavailable = function (e) {
        recordedChunks.push(event.data);
        // for demo, removed stop() call to capture more than one frame
    }

    mediaRecorder.onstop = function (event) {
        var blob = new Blob(recordedChunks, {
            "type": "video/webm"
        });
        var url = URL.createObjectURL(blob);
        res({url, blob}); // resolve both blob and url in an object

        myVideo.src = url;
        // removed data url conversion for brevity
    }

// for demo, draw random lines and then stop recording
var i = 0,
tid = setInterval(()=>{
  if(i++ > 20) { // draw 20 lines
    clearInterval(tid);
    mediaRecorder.stop();
  }
  let canvas = document.querySelector("canvas");
  let cx = canvas.getContext("2d");
  cx.beginPath();
  cx.strokeStyle = 'green';
  cx.moveTo(Math.random()*100, Math.random()*100);
  cx.lineTo(Math.random()*100, Math.random()*100);
  cx.stroke();
},200)

});
}

  


  &#xA;&#xA;&#xA;<code class="echappe-js">&lt;script src=&quot;https://unpkg.com/@ffmpeg/ffmpeg@0.8.1/dist/ffmpeg.min.js&quot; defer&gt;&lt;/script&gt;&#xA;&lt;script src='http://stackoverflow.com/feeds/tag/canvas2mp4.js' defer&gt;&lt;/script&gt;&#xA;&#xA;&#xA;&#xA;here is a canvas
  &#xA;
  &#xA;&#xA;here is a recorded video of the canvas in webM format
  &#xA;
  &#xA;&#xA;&#xA;here is a transcoded mp4 from the webm above CLIENT SIDE using ffmpeg
  &#xA;
  &#xA;&#xA;
  
  &#xA;&#xA;
  

  


  


  



• How to create an image using ffmpeg and PHP ?

  19 décembre 2014, par webkul

  I’m using this script, but I’m not able to create the image.

  My file is here.

• How to make VideoCodec.Raw with Accord.Video.FFMPEG ?

  13 décembre 2020, par ryanm8227

  I have succeeded with VideoCodec.MPEG4 but unfortunately, the video quality is terrible :

  


  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Accord.Video.FFMPEG;

namespace Screen_Recorder
{
    public partial class Form1 : Form
    {
        Timer timer1 = new Timer();
        VideoFileWriter vf = new VideoFileWriter();

        System.Random r = new System.Random();

        long rnd(double a, double b)
        {
            return Convert.ToInt64(a + r.NextDouble() * (b - a));
        }

        public Form1()
        {
            InitializeComponent();
            timer1.Interval = 10;
            timer1.Tick += Timer1_Tick;

            vf.Open(Convert.ToString(rnd(9999999999999999, 1000000000000000)) + ".mp4", 1920, 1080, 25, VideoCodec.MPEG4, 1000000);
            
        }

        private void Timer1_Tick(object sender, EventArgs e)
        {
            Bitmap bp = new Bitmap(1920, 1080);
            Graphics gr = Graphics.FromImage(bp);
            gr.CopyFromScreen(0, 0, 0, 0, new Size(bp.Width, bp.Height));

            pictureBox1.Image = bp;
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

            vf.WriteVideoFrame(bp);
        }

        private void buttonStartRecording_Click(object sender, EventArgs e)
        {
            timer1.Start();
        }

        private void buttonStopRecording_Click(object sender, EventArgs e)
        {
            timer1.Stop();
            vf.Close();
        }
    }
}


  


  That being said, I would like to try making the video without the MPEG4, but with RAW, which is simply a non-compressed video. I expect the size to be pretty big, but that is not an issue.