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• FFMPEG sidechaincompress error initializing complex filters with invalid argument

  15 août 2022, par DevDevRun

  I am using FFMPEG to convert process various audio files.
When using the sidechaincompress filter, I found this command line to work on my personal Windows 10 machine but not working anymore on our Debian server.
Maybe this command is not working anymore on newer version, or am I missing something (a «’» in the commande line, or a package ?) on our Linux server ? We definitely need to use this sidechaincompress filter with two audio files « Assets » and « Main ».

  


  Here is the command we run :

  


  FFMPEG -i /var/asset.flac -i /var/main.flac -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress=threshold=0.05:ratio=11:release:3000[compr];[compr][mix]amix=normalize=0" /var/sidechain.flacs


  


  Linux version : ffmpeg version 4.3.4-0+deb11u1

  


  and it returns :

  


  ffmpeg version 4.3.4-0+deb11u1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10 (Debian 10.2.1-6)
  configuration: --prefix=/usr --extra-version=0+deb11u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librsvg --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-libwavpack --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-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, flac, from '/var/asset.flac':
  Metadata:
    encoder         : Lavf59.25.100
  Duration: 00:02:33.65, start: 0.000000, bitrate: 760 kb/s
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s32 (24 bit)
Input #1, flac, from '/var/2-main.flac':
  Metadata:
    encoder         : Lavf58.45.100
  Duration: 00:02:33.65, start: 0.000000, bitrate: 1093 kb/s
    Stream #1:0: Audio: flac, 44100 Hz, stereo, s32 (24 bit)
[sidechaincompress @ 0x5622749721c0] [Eval @ 0x7fff94caf520] Undefined constant or missing '(' in 'release'
[sidechaincompress @ 0x5622749721c0] Unable to parse option value "release"
[sidechaincompress @ 0x5622749721c0] Value 3000.000000 for parameter 'mode' out of range [0 - 1]
[sidechaincompress @ 0x5622749721c0] [Eval @ 0x7fff94caf550] Undefined constant or missing '(' in 'release'
[sidechaincompress @ 0x5622749721c0] Unable to parse option value "release"
[sidechaincompress @ 0x5622749721c0] Error setting option level_in to value release.
[Parsed_sidechaincompress_1 @ 0x5622749720c0] Error applying options to the filter.
[AVFilterGraph @ 0x56227493ea40] Error initializing filter 'sidechaincompress' with args 'threshold=0.05:ratio=11:release:3000'
Error initializing complex filters.
Invalid argument


  


• How much of modern FFmpeg is written by Fabrice Bellard ?

  17 décembre 2022, par Hashim Aziz

  FFmpeg is considered by many to be the work of Fabrice Bellard, and maybe even his magnum opus, but since he stopped contributing to the project (under the pseudonym Gérard Lantau) in 2004, I wondered how much of it can actually still be said to be his. By comparison, Linus Torvalds' Wikipedia page states :

  


  


  As of 2006, approximately 2% of the Linux kernel was written by
Torvalds himself.[28] Because thousands have contributed to it, his
percentage is still one of the largest. However, he said in 2012 that
his own personal contribution is now mostly merging code written by
others, with little programming.

  


  


  This despite the fact that Torvalds is still an active contributor to the Linux kernel, whereas Bellard hasn't been an active contributor to FFmpeg for almost two decades.

  


  FFmpeg being an open-source project tracked with Git, it seems like the question should be technically and objectively answerable, but as someone who hates mailing lists and the generally archaic ways that big open-source projects like to do things, I wouldn't know where to start in doing so.

  


  Just how much of the modern FFmpeg codebase is Fabrice Bellard actually responsible for, in comparison to the other FFmpeg devs ?

  


• bash script with conditional arguments and output pipe not working [duplicate]

  19 décembre 2022, par Pavel

  Can u please help me with bash script for ffmpeg ?
Trying to create condition based on args to play OR save media to file, so I've created this kind of IF :

  


  #!/bin/bash

if [ "$1" == "play" ]; then
    POSTFIX="-f matroska - | mpv -"
else
    POSTFIX="-y $OUTPUT"
fi

ffmpeg \
  # skipped personal ffmpeg stuff
  "$POSTFIX"


  


  Now when I try to run it with "play" argument it says :

  


  Unrecognized option 'f matroska - | mpv -'.


  


  So if I add this POSTFIX both variants to command everything works fine...

  


  It looks like something in my bash screens this args or something like that ? Also I don't see in error this dash symbol before f option