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• Converting an audio file from .oga format to .mp3 using ffmpeg package on nodeJs produces a max of 3 seconds output file no matter the input duration

  15 janvier 2024, par JnrLouis

  I am downloading an audio file in .oga format and saving it. Then I am trying to convert the file to .mp3 format, but the issue is the output file is always truncated and a maximum of 3 seconds. I have gone through the fluent-ffmpeg library and I can't seem to find what I'm doing wrong.

  


  I have ffmpeg installed and I'm using the fluent-ffmpeg library. The downloaded .oga file doesn't seem to have any issues, the issue is after it gets converted to .mp3.

  


  I also tried converting to .wav, and I faced the same issue.

  


  Below is my current code :

  


  const fs = require("fs");
const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
const ffmpeg = require('fluent-ffmpeg');
ffmpeg.setFfmpegPath(ffmpegPath);
const axios = require("axios");

const inputPath = __dirname + '/audio/input.oga';
const outputPath = __dirname + '/audio/output.mp3';

const saveVoiceMessage = async (url) => {
    try {
        const response = await axios({
            method: 'GET',
            url: url,
            responseType: 'stream'
        });
        const inStream = fs.createWriteStream(inputPath);
        await response.data.pipe(inStream);
    } catch (error) {
        console.error(error);
    }
}

const convertToMp3 = async () => {
    try {
        const outStream = fs.createWriteStream(outputPath);
        const inStream = fs.createReadStream(inputPath);
        // I also tried using the inputPath directly, still didn't work
        ffmpeg(inStream)
            .toFormat("mp3")
            .on('error', error => console.log(`Encoding Error: ${error.message}`))
            .on('exit', () => console.log('Audio recorder exited'))
            .on('close', () => console.log('Audio recorder closed'))
            .on('end', () => console.log('Audio Transcoding succeeded !'))
            .pipe(outStream, { end: true })
    } catch (error) {
        console.error(error);
    }
}

const saveAndConvertToMp3 = async (url) => {
    try {
        await saveVoiceMessage(url);
        await convertToMp3();
        }

    } catch (error) {
        console.error(error);
    }
}


  


• Subtitles in ffmpeg/libavfilter

  15 juin 2021, par Captain Jack

  I have a C program to read video/audio with libav/ffmpeg libraries and decode it.

  



  I am playing with some filters and most work just fine. I can draw text, overlay logos, flip and invert video colours. However, I am having big issues overlaying subtitles.

  



  My filter is very simple.

  



  const char *vfilter_descr = "[in]subtitles=subs.srt[out]";


  



  On the console I get this :

  



  [Parsed_subtitles_0 @ 0x7fe76c703240] Shaper: FriBidi 0.19.7 (SIMPLE) HarfBuzz-ng 2.4.0 (COMPLEX)
[Parsed_subtitles_0 @ 0x7fe76c703240] Using font provider coretext
[Parsed_subtitles_0 @ 0x7fe76c703240] fontselect: (Arial, 400, 0) -> /Library/Fonts/Microsoft/Arial.ttf, -1, ArialMT
[Parsed_subtitles_0 @ 0x7fe76c703240] fontselect: (Arial, 400, 100) -> /Library/Fonts/Microsoft/Arial Italic.ttf, -1, Arial-ItalicMT


  



  ...which somewhat confirms that subtitles are loading, though I am not sure why there are two fonts being loaded ?

  



  However, they are not showing at all - almost as if they never loaded. I tried several different files, including ASS ones but no luck.

  



  ffmpeg version is the latest one.

  



  $ ffmpeg -v
ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100


  



  Any ideas ?

  


• How to burn subtitles into video with FFMPEG.wasm ?

  22 août 2023, par Jim

  In a react project, with node v.16+, and @ffmpeg/ffmpeg v0.10.1 and @ffmpeg/core v0.10.0

  


  Im trying to burn subtitles into an .mp4, in-browser.

  


  the command used was :

  


  await ffmpeg.current.run('-i', 'test-input.mp4', '-vf', `subtitles=testSRT.srt`, 'test-output-2.mp4');

  


  the ffmpeg configuration info is

  


  


  configuration : —target-os=none —arch=x86_32 —enable-cross-compile
—disable-x86asm —disable-inline-asm —disable-stripping —disable-programs —disable-doc —disable-debug —disable-runtime-cpudetect —disable-autodetect —extra-cflags='-s USE_PTHREADS=1 -I/src/build/include -O3 —closure 1'
—extra-cxxflags='-s USE_PTHREADS=1 -I/src/build/include -O3 —closure 1' —extra-ldflags='-s USE_PTHREADS=1 -I/src/build/include -O3
—closure 1 -L/src/build/lib' —pkg-config-flags=—static —nm=llvm-nm —ar=emar —ranlib=emranlib —cc=emcc —cxx=em++ —objcc=emcc —dep-cc=emcc —enable-gpl —enable-nonfree —enable-zlib —enable-libx264 —enable-libx265 —enable-libvpx —enable-libwavpack —enable-libmp3lame —enable-libfdk-aac —enable-libtheora —enable-libvorbis —enable-libfreetype —enable-libopus —enable-libwebp —enable-libass —enable-libfribidi

  


  


  the way i set the core package is like so :

  


  ffmpeg.current = createFFmpeg({
  corePath: 'https://unpkg.com/@ffmpeg/core@0.10.0/dist/ffmpeg-core.js',
  log: true
})


  


  so this build is configured with libass as you can see in the config info, so it shouldnt have a problem with subtitling. but im getting an error related to the font, which i never explicitly set. this is the only error output related to subtitling

  


  [Parsed_subtitles_0 @ 0x2134b80] can't find selected font provider

  


  [Parsed_subtitles_0 @ 0x3764100] fontselect: failed to find any fallback for font: (Arial, 400, 0)

  


  so the video is output to the set location, but theres no subtitles on the video. i assume because there was some error with the font, even though none was set. one other thing i tried to do was add a .ttf file to the project in assets/fonts/ and explicitly set the fontsdir value in the filter, but it seemed to have the same issues as well, heres that example :

  


  await ffmpeg.current.run('-i', 'test-input.mp4', '-vf', `subtitles=testSRT.srt: fontsdir=../assets/fonts: force_style='Arial'`, 'test-output-2.mp4');