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• FFmpeg Error : Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_amix_54

  25 mai 2024, par Josh Lawson

  I'm working on a project to generate a click track using React.js and FFmpeg. The project includes an Express.js backend where I construct an FFmpeg command to combine multiple audio files (count-ins, vocal cues, and click sounds) into a single track. The final output should be an MP3 file.

  


  However, I'm encountering an error when running the FFmpeg command :

  


  Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_amix_54


  


  How can I correctly construct the FFmpeg command to avoid the "Cannot find a matching stream for unlabeled input pad" error and ensure all inputs are properly processed and mixed ?

  


  Here is the relevant part of my server.js code :

  


  const express = require('express');
const bodyParser = require('body-parser');
const { exec } = require('child_process');
const path = require('path');
const fs = require('fs');
const ffmpegPath = require('ffmpeg-static');
const cors = require('cors');

const app = express();
app.use(cors());
app.use(bodyParser.json());

app.post('/generate-click-track', (req, res) => {
    const { tempo, timeSignature, clickSound, subdivisions, sections } = req.body;
    const clickSoundPath = path.join(__dirname, 'public', 'click-sounds');
    const vocalCuesPath = path.join(__dirname, 'public', 'vocal-cues');

    const beatsPerBar = parseInt(timeSignature.split('/')[0]);
    const beatsPerMinute = tempo;
    let totalBeats = 0;
    const sectionStarts = [];

    sections.forEach((section, index) => {
        if (index > 0) {
            sectionStarts.push(totalBeats);
        }
        totalBeats += section.length * beatsPerBar;
    });

    const outputFilePath = path.join(__dirname, 'output', 'click-track.mp3');
    const tempDir = path.join(__dirname, 'temp');

    if (!fs.existsSync(tempDir)) {
        fs.mkdirSync(tempDir);
    }

    const countInFiles = Array.from({ length: beatsPerBar }, (_, i) => path.join(vocalCuesPath, 'count-ins', `${i + 1}.wav`));

    let ffmpegCommand = '';

    // Add count-in files
    countInFiles.forEach(file => {
        ffmpegCommand += `-i "${file}" `;
    });

    // Add section vocal cues and click sounds
    sections.forEach((section, index) => {
        const vocalCueFile = path.join(vocalCuesPath, `${section.name}.wav`);
        ffmpegCommand += `-i "${vocalCueFile}" `;

        for (let i = 0; i < section.length * beatsPerBar; i++) {
            const clickFile = i % beatsPerBar === 0 ? `${clickSound}-accents.mp3` : `${clickSound}.mp3`;
            ffmpegCommand += `-i "${path.join(clickSoundPath, clickFile)}" `;
        }
    });

    ffmpegCommand += `-filter_complex "`;

    let inputCount = 0;
    countInFiles.forEach((_, index) => {
        ffmpegCommand += `[${inputCount}:0]adelay=${index * (60 / beatsPerMinute) * 1000}|${index * (60 / beatsPerMinute) * 1000}[a${inputCount}]; `;
        inputCount++;
    });

    sections.forEach((section, index) => {
        const delay = (sectionStarts[index] ? sectionStarts[index] : 0) * (60 / beatsPerMinute) * 1000;
        ffmpegCommand += `[${inputCount}:0]adelay=${delay}|${delay}[a${inputCount}]; `;
        inputCount++;

        for (let i = 0; i < section.length * beatsPerBar; i++) {
            const delay = (sectionStarts[index] ? sectionStarts[index] : 0) * (60 / beatsPerMinute) * 1000 + (i * 60 / beatsPerMinute) * 1000;
            ffmpegCommand += `[${inputCount}:0]adelay=${delay}|${delay}[a${inputCount}]; `;
            inputCount++;
        }
    });

    ffmpegCommand += `amix=inputs=${inputCount}:duration=longest" -codec:a libmp3lame -b:a 192k -y "${outputFilePath}"`;

    console.log(`Executing ffmpeg command: ${ffmpegCommand}`);

    exec(`${ffmpegPath} ${ffmpegCommand}`, (error, stdout, stderr) => {
        if (error) {
            console.error(`Error generating click track: ${error.message}`);
            res.status(500).send('Error generating click track');
            return;
        }

        res.download(outputFilePath, 'click-track.mp3', (err) => {
            if (err) {
                console.error(`Error sending file: ${err.message}`);
            }

            // Clean up temp directory
            fs.readdir(tempDir, (err, files) => {
                if (err) throw err;
                for (const file of files) {
                    fs.unlink(path.join(tempDir, file), err => {
                        if (err) throw err;
                    });
                }
            });
        });
    });
});

app.listen(3001, () => {
    console.log('Server running on http://localhost:3001');
});


  


  I can't include the full error messge as it is too long, but if anyone needs it, I'm happy to link to a text file that includes it.

  


  What I have tried :

  


  

  1. Verified all file paths and ensured they exist.

  


  2. Escaped file paths to handle spaces in filenames.

  


  3. Logged the constructed FFmpeg command and ran it manually, which still produced the same error.

  


  


  Environment

  


  

  • React.js : v18.3.1

  


  • Node.js : v22.2.0

  


  • Express : v4.19.2

  


  • FFmpeg : static build via ffmpeg-static (v5.2.0)

  


  


• After uploading .aab file it is not showing app size based on mobile architecture

  11 septembre 2019, par Mani

  In my project i am using assets ffmpeg static binarie files for both 32 and 64 bit it’s working fine in both mobile architectures but i have problem about .aab file size. The app size is increased to 17mb after adding 64 bit file,I am using .aab file for uploading but the size is same for both the architectures.Please tell me how to reduce app size based on mobile architecture thank you.

• ffmpeg does not draw text

  4 septembre 2016, par Michael Heuberger

  hope one of you can tell me why this ffmpeg command of mine does not draw the desired text. the produced video doesn’t have it. here you go :

  ffmpeg -f image2 -thread_queue_size 64 -framerate 15.1 -i /home/michael-heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e6-723f-d0aa0bd0-aa9b-f7da27da678f/frames/%d.webp -y -an -vcodec libvpx -filter:v drawtext=fontfile=/home/michael-heuberger/binarykitchen/code/videomail.io/src/assets/fonts/Varela-Regular.ttf:text=www.videomail.io:fontsize=180:fontcolor=white:x=150:y=150:shadowcolor=black:shadowx=2:shadowy=2 -vf scale=trunc(iw/2)*2:trunc(ih/2)*2 -crf 12 -deadline realtime -cpu-used 4 -pix_fmt yuv420p -loglevel warning -movflags +faststart /home/michael-heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e6-723f-d0aa0bd0-aa9b-f7da27da678f/videomail_preview.webm

  the crucial part is this video filter :

  -filter:v drawtext=fontfile=/home/michael-heuberger/binarykitchen/code/videomail.io/src/assets/fonts/Varela-Regular.ttf:text=www.videomail.io:fontsize=180:fontcolor=white:x=150:y=150:shadowcolor=black:shadowx=2:shadowy=2

  does it seem correct to you ? if so, then why am i not seeing any text in the videomail_preview.webm video file ?

  using ffmpeg v2.8.6 here with —enable-libfreetype, —enable-libfontconfig and —enable-libfribidi enabled.

  furthermore, the above command has been produced with fluent-ffmpeg.

  so, any ideas ?