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• ffmpeg with delayed inputs put an extra audio output at 0 seconds

  19 mars 2023, par Ralph

  Can someone explain why the input files are played 4 times in total, at 0, 1, 2, 3 seconds.

  


  

  1. The ffmpeg processes three input files (mp3).

  


  2. The complex filter delays the inputs by 1, 2, 3 seconds input-wise.

  


  3. amix mixes the delayed outputs together.

  


  4. And finally, a coded transforms it into an output mp3.

  


  


  ffmpeg -i in0.mp3 -i in1.mp3 -i in2.mp3 -filter_complex "[0]adelay=1000[delayed1];[1]adelay=2000[delayed2];[2]adelay=3000[delayed3];[delayed1][delayed2][delayed3]amix=inputs=3:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3


  


  short version : 2 delayed beeps, an finally there come 3 beeps out (@ 0, 1, 2 seconds) :

  


  ffmpeg -i beep.mp3 -filter_complex "[0]adelay=1000[delayed1];[0]adelay=2000[delayed2];[delayed1][delayed2]amix=inputs=2:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3


  


  ffmpeg version N-110011-gf456c192d9-tessus on a Mac M1.

  


  I added also a silent input file from 0 to 1 seconds without any alteration of the outcome.
I added a silent stream as input as well without improvement. E.g. :

  


  ... -filter_complex "aevalsrc=0:d=4[silence];...


  


  Another test with another ffmpeg version 5.1 Copyright (c) 2000-2022 the FFmpeg developers built with Apple clang version 13.1.6 (clang-1316.0.21.2.5) :
ffmpeg -i beep.mp3 -filter_complex "[0]adelay=1000[delayed1];aevalsrc=0:d=5[silence];[silence][delayed1]amix=inputs=2:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3
There are again 2 beeps, at 0 and 1 second - going mad here !

  


  (concat solves the issue. But I want to have a flexible solution with possibly overlapping audio streams.) Thanks for giving a hint !

  


• Fluent-ffmpeg node js adding subtitles properly on mac but isn't working on ubuntu

  23 décembre 2022, par Ibrahim Nabi

  I have the same version on both OS but still get different output.

  


  Here is the output that I get on ubuntu for Bengali subtitles :
Ubuntu Output Subtitles

  


  Here is the version and configuration for ubuntu 20 :

  


  `

  


  ffmpeg version 5.1.2-0ubuntu1~20.04.sav1.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --prefix=/usr --extra-version='0ubuntu1~20.04.sav1.1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-lcms2 --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-sndio --enable-pocketsphinx --enable-librsvg --enable-libdav1d --enable-libjxl --enable-librist --enable-libvmaf --enable-libzimg --enable-crystalhd --enable-libmfx --enable-libsvtav1 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100


  


  `

  


  And here is the version and config for mac os :

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers built with Apple clang version 14.0.0 (clang-1400.0.29.102) configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon libavutil      57. 28.100 / 57. 28.100 libavcodec     59. 37.100 / 59. 37.100 libavformat    59. 27.100 / 59. 27.100 libavdevice    59.  7.100 / 59.  7.100 libavfilter     8. 44.100 /  8. 44.100 libswscale      6.  7.100 /  6.  7.100 libswresample   4.  7.100 /  4.  7.100 libpostproc    56.  6.100 / 56.  6.100

  


  Also My code is simply this :

  


  `

  


   ffmpeg(fileName)
    .videoCodec("libx264")
    .audioCodec("libmp3lame")
    .outputOptions(`-vf subtitles=${subtitlesPath}`)
    .on("error", function (err) {
      callback(true, err);
    })
    .save(outputBurnedVideo)
    .on("end", async function () {
      await callback(false, "done");
    });


  


  `

  


  I have tried using the sub_charenc option but I wasn't able to get the proper result.

  


• Revision 30768 : Petites modifs

  9 août 2009, par kent1@… — Log

  Petites modifs