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• combine two audio files with a command line tool

  29 août 2018, par holographix

  I’ve to merge two (or more) audio files (like a guitar and a drum track) into a single file.
  I’m running over linux CentOS and I’d need a command line tool to do so, because I’ve got to run this as part of a background process, triggered via crontab of a custom bash script.
  I also need to be able to change the pan, volume, trim and start time (i.e I want the guitar track to start after 1.25ms after the drum track so that they can be both in sync with each other).

  My first choice would be ffmpeg, but I was wondering if there could be something more specific, reliable and less fuzzy than ffmpeg.

  thx a ton !
   k-

• Discord music Bot Python starts ffmpeg, green light appears around bot but no audio plays [closed]

  27 avril 2023, par QuestionHaver99

  I've tried using FFmpegOpusAudio and FFMPEGPCMaudio instead, but it gives the same issue. FFMPEG starts and the green light of the bot in the channel shows, but no audio plays, and then the bot exits the channel when the song should be over and FFMPEG terminates. I've tried streaming the audio and playing from a local file, and the same issue.

  


  and just as a quick checklist of confirmed not the issues : the volume is fine and the permissions are fine and ffmpeg is in environment variables and set up correctly.

  


  any advice would be greatly appreciated

  


• FFMpeg ; Error when mixing two audio stream

  27 février 2021, par Ali Esmailpor

  I'm recording two stream by ffmpeg with this command :

  


  ffmpeg -protocol_whitelist pipe,udp,rtp -fflags +genpts -f sdp -i pipe:0 \
-map 0:v:0 -c:v copy \
-filter_complex \
"[0:a:0]volume=0.5[a0]; \
 [0:a:1]volume=0.5[a1]; \
 [a0][a1]amerge=inputs=2,pan=stereo|c0code>

  


  that [0:v:0] is my video stream and [0:a:0] and [0:a:1] are my audio streams that I want to mix them up and record it associate with video stream.

  


  But unfortunately, I get this ugly error sometimes that it causes silence in final video. I mean, when I get this error my final video becomes silence.

  


  


  LBRR frames is not implemented. Update your FFmpeg version to the
newest one from Git. If the problem still occurs, it means that your
file has a feature which has not been implemented.

  


  Error decoding a SILK frame.

  


  Error decoding an Opus frame.

  


  


  My ffmpeg version is :

  


  ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100


  


  Where am I wrong ?