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• How to read stream data as chunk ?

  5 juillet 2022, par imagesck

  I try to lean, how to read chunk of stream data. It almost works, it likes i misunderstanding implement allocate buffer size in pause event of stdout. the video that i use is https://www.youtube.com/watch?v=oiNkumxPVzU. 480p. ffmpeg freeze to encode at 03:53, no error, just freeze likes missing require bytes. the video length exactly is 03:55.

  


  const { spawn } = require('child_process');
const path = require('path');

const decArgs = [
    '-i', path.join(__dirname + '/public/future.mkv'),
    '-an',
    '-pix_fmt', 'rgb32',
    '-f', 'rawvideo',
    '-'
];

const decode = spawn('ffmpeg', decArgs, {
    stdio: [
        'ignore',
        'pipe',
        'ignore'
    ] 
});

// Encode section
const width = 854;
const height = 480;
const channels = 4;
const fps = 29.97002997002997.toString();
const colorsLength = width*height*channels;


const encArgs = [
    '-pix_fmt', 'rgb32',
    '-f', 'rawvideo',
    '-s', `${width}x${height}`,
    '-r', fps,
    '-i', '-',
    '-c:v', 'libx264',
    '-preset', 'ultrafast',
    '-crf', '30',
    '-pix_fmt', 'yuv420p',
    '-r', fps,
    '-y',
    path.join(__dirname + '/public/output.mp4')
];

const encode = spawn('ffmpeg', encArgs, {
    stdio: [
        'pipe',
        'ignore',
        'pipe'
    ]
});

// colors RGBA
let buffer = Buffer.alloc(0);
decode.stdout.on('data', data => {
    const allocSize = buffer.length + data.length;
    buffer = Buffer.concat([buffer, data], allocSize);
    
    if (buffer.length > colorsLength) decode.stdout.pause();
});

decode.stdout.on('pause', () => {
    // Create new buffer with size of colors length
    const bufferData = Buffer.alloc(colorsLength);
    buffer.copy(bufferData, 0, 0, colorsLength);
    // after manipulate the buffer send it to encode
    encode.stdin.write(bufferData);
    
    // Create new buffer to take out left buffer. cause stream length cant be predict.
    const leftBuffer = Buffer.alloc(buffer.length - bufferData.length);
    buffer.copy(leftBuffer, 0, buffer.length - bufferData.length, buffer.length);
    buffer = leftBuffer;

    decode.stdout.resume()
});

decode.stdout.on('end', () => {
    if (buffer.length) encode.stdin.write(buffer);
})

encode.stderr.on('data', data => {
    console.log(data.toString())
})


  


• Spring Boot serving an m3u8 playlist

  13 octobre 2023, par Ph33ly

  I'm trying to serve an m3u8 playlist through Spring Boot. I have a running ffmpeg process that is transcoding a multicast in real-time and sending the files to /src/resources/public/output.m3u8. I see the playlist updating and the new .ts files being generated correctly however when trying to watch the stream in a video player, it only plays a certain amount of video. Is there a way to properly serve up a running playlist in Java instead of serving it statically ?

  



  EDIT : When starting a basic http server with python python3 -m http.server, I'm able to view the stream perfectly fine. Is there a Spring Boot way to accomplish the same task ?

  


• where to save mpd file in raspberry pi so dash.js can access it remotely ?

  11 mai 2016, par Djm

  This is very high level question. I want to stream a live video from raspberry pi. I want to be able to watch live video in the browser remotely being streamed by the Raspberry pi.I want to use DASH stream protocol, and Dash.js as client to HTML5. I have looked through different tutorials but i am still puzzled about how this works.I understand that (assuming you have already prepared your videos with FFMPEG tool) from the client Dash.js
  you have to make a call/request and pass a url to your mpd file. My question is where would you save the file in raspberry pi especially if the Dash client is in a different web app(i want to make the call remotely) ?