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• ffmpeg waits to close the pipe in order to start processing data

  15 juin 2022, par Mahmoud Ferig

  I'm struggling with this issue.
Here I am trying to stream video using ffmpeg from images and audio file this code below works fine but it is start streaming after stdin closed, I would expect ffmpeg to start processing the pipe input as it is received, and immediately output the result.

  


  p = subprocess.Popen(
    [
        'ffmpeg',
        '-y',
        '-re',
        '-f', 'image2pipe',
        '-vcodec', 'mjpeg',
        '-framerate', '15',
        '-analyzeduration', '2147483647',
        '-probesize', '2147483647',
        '-i', '-',
        '-vn', '-i', audio_path,
        '-c:v', 'libx264',
        '-pix_fmt', 'yuv420p',
        '-preset', 'ultrafast',
        '-c:a', 'aac',
        '-f', 'flv',
        rtmp_url
    ],
    stdin=subprocess.PIPE,
    stdout=subprocess.PIPE
)

time.sleep(2)

i = 0
while True:
    current_images = [name for name in os.listdir(img_dir) if os.path.isfile(os.path.join(img_dir, name))]
    current_images = sorted(current_images)
    if i > fnum-1:
        print("frame read failed")
        break
    try:
        img = cv2.imread(os.path.join(img_dir, current_images[i]))
        success, buffer = cv2.imencode('.jpg', img)
        frame = buffer.tobytes()
        p.stdin.write(frame)
        i += 1
    except:
        time.sleep(2)
        pass

p.stdin.close()
p.wait()


  


  Why is ffmpeg waiting to close the pipe to start processing ? Can it be configured to start a live transcoding of the received stream ?

  


  Do you know how can I convince ffmpeg to start producing output immediately ?

  


  Thank you !

  


• How can I create a write stream for res for a child_process.spawn method as it says cp.spawn().pipe(res) is not a method

  11 juin 2022, par niishaaant

  const express = require('express');
const router = express.Router();
const ytdl = require('ytdl-core');
const cp = require('child_process');
const ffmpeg = require('ffmpeg-static');

router.get('/', async (req, res) => {
    const { v, f, q } = req.query;
    if (!ytdl.validateID(v) && !ytdl.validateURL(v)) {
        return res
            .status(400)
            .json({ success: false, error: 'No valid YouTube Id!' });
    }
    try {
        let info = await ytdl.getInfo(v);

        //set format and title
        // const title = info.videoDetails.title;
        // res.setHeader('Content-disposition', contentDisposition(`${title}${f}`));

        //define audio and video stream seperately and download them
        const audio = ytdl(v, { quality: 'highestaudio' }).on(
            'progress',
            (_, downloaded, total) => {
                console.log({ downloaded, total });
            }
        );
        let format = ytdl.chooseFormat(info.formats, { quality: q });
        const video = ytdl(v, { format }).on('progress', (_, downloaded, total) => {
            console.log({ downloaded, total });
        });

        const ffmpegProcess = cp
            .spawn(
                ffmpeg,
                [
                    // Remove ffmpeg's console spamming
                    '-loglevel',
                    '8',
                    '-hide_banner',
                    // Redirect/Enable progress messages
                    '-progress',
                    'pipe:3',
                    // Set inputs
                    '-i',
                    'pipe:4',
                    '-i',
                    'pipe:5',
                    // Map audio & video from streams
                    '-map',
                    '0:a',
                    '-map',
                    '1:v',
                    // Keep encoding
                    '-c:v',
                    'copy',
                    // Define output file
                    `out.${f}`,
                ],
                {
                    windowsHide: true,
                    stdio: [
                        /* Standard: stdin, stdout, stderr */
                        'inherit',
                        'inherit',
                        'inherit',
                        /* Custom: pipe:3, pipe:4, pipe:5 */
                        'pipe',
                        'pipe',
                        'pipe',
                    ],
                }
            )
            .on('close', () => {
                console.log('done');
            });

        // Link streams
        // FFmpeg creates the transformer streams and we just have to insert / read data
        ffmpegProcess.stdio[3].on('data', (chunk) => {
            // Parse the param=value list returned by ffmpeg
            const lines = chunk.toString().trim().split('\n');
            const args = {};
            for (const l of lines) {
                const [key, value] = l.split('=');
                args[key.trim()] = value.trim();
            }
        });
        audio.pipe(ffmpegProcess.stdio[4]);
        video.pipe(ffmpegProcess.stdio[5]);
    } catch (error) {
        res.status(400);
        console.log('error ', error);
    }
});

module.exports = router;


  


  


  I am trying to create a youtube downloader app and this is the code for downloading a video using the ytdl and ffmpeg packages in an express route but i don't know how i can download the result (out.mp4) for the client. when I try to pipe it to res error occurs saying cp.spawn().pipe() is not a method.

  


  


• Pipe ffmpeg process with node js

  20 juin 2022, par Max

  When I make request to route, spawn process and pipe it directly to response, it works perfectly fine and creates livestream. However, it takes some time to start process and buffer some data to start playing video.

  


  app.get("/stream", async (req, res) => {
  const url = "rtsp://213.3.38.11/axis-media/media.amp";

  const cmd = [
    "-re",
    "-loglevel",
    "debug",
    "-reorder_queue_size",
    "5",
    "-rtsp_transport",
    "tcp",
    "-i",
    `${url}`,
    "-c:v",
    "copy",
    "-c:a",
    "aac",
    "-f",
    "mp4",
    "-movflags",
    "+frag_keyframe+empty_moov+default_base_moof",
    "pipe:1",
  ];

  const child = spawn("ffmpeg", cmd, {
    stdio: ["ignore", "pipe", process.stderr],
  });

  child.stdio[1].pipe(res)l

  res.on("close", () => {
    child.stdio[1].unpipe(res);
  });
});



  


  I would like to create process while starting server so I can pipe it whenever I make request to that route, but when I do so, process is living for a few seconds then stops using cpu. Sometimes it lives, but dies when I make request and try piping it.