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• 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.

  


  


• FFmpeg + HTTP Images - How to recover from lost connection ?

  20 juin 2019, par user11588722

  I have a command which works very well, but stops dead if the connection is lost for even a second. The images are remotely hosted. Is there a way to prevent the command from completely stopping ? Maybe make it continue after the connection comes back ?

  ffmpeg -y -f concat -safe 0 -protocol_whitelist "file,http,https,tcp,tls" -i "Temp/images.txt" -i "Assets/screen.png" -i "Temp/audio.mp3" -filter_complex "[0]scale=3840x2160,zoompan=z='if(lte(zoom,1.0),1.2,max(1.001,zoom-0.0010))':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':fps=15:d=200[p];[p][1]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2, drawtext=fontfile=Assets/Fonts/Heathergreen.otf:text='%%~ni':fontcolor=black:fontsize=32:x=90:y=582[v];[2:a]showwaves=mode=cline:s=110x36:r=15:scale=sqrt:colors=0x222222,colorkey=0x000000:0.01:0.1,format=yuva420p[w];[v][w]overlay=77:444,scale=1280:720[outv]" -map "[outv]" -map 2:a -c:v libx264 -c:a aac -preset ultrafast -shortest "Temp/video.mp4"

  I’ve tried looking into FFmpeg documentation and tried timeouts and other options, but either they don’t work or (more likely) I’m doing something wrong.
  Any advice would be appreciated. Thank you.

• Automatically fade audio

  25 mars 2019, par Nadav Tasher

  I have a working script that plays a different audio every 45 minutes.

  The audio files change on a daily basis, so i cant manually fade them in/out in Audacity.

  In the script, i have the following line :

  ffplay -i /home/user/Ringtone1.mp3 -ss 00:00:7 -t 20 -nodisp -autoexit

  But every time, the audio cuts abruptly after 20 seconds, which isn’t very ear-pleasing.

  I want to make the audio fade in from 0 to max in 5 seconds and then fade out from max to 0 in 5 seconds (at the end of the 20 seconds).

  How can i do that ?