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• mp3 to wav with ffmpeg reduces quality and duration

  25 novembre 2020, par Neret

  I took this mp3 file and converted it to wav with Audition and with this ffmpeg command :

  


  ffmpeg -i "Casey Don’t You Fret - Dan Lebowitz.mp3" -c:a pcm_f32le "Casey Don’t You Fret - Dan Lebowitz_FFMPEG.wav"


  


  After that I checked the statistics in Audition. The wav file which was generated with Audition has exactly the same statistics as the original mp3 file.

  


  

  


  The duration of ffmpeg file has changed. Audio statistics became worse.
Why is this happening ? Can I fix it ?

  


  I used ffmpeg version 2020-11-22-git-0066bf4d1a-full_build-www.gyan.dev on Windows.

  


  UPDATE 1 :
I cut a few seconds of mp3 at the beginning and at the end :

  


  

  


  FFMPEG added silence at the beginning and increased duration.

  


  UPDATE 2 :
Look how ffmpeg changed the waveform of this 2.mp3 file in the middle :

  


  ffmpeg -y -i 2.mp3 -c:a pcm_f32le 2_FFMPEG.wav


  


  


  


• TCP Connection refused error when using FFMPEG for audio stream to HTTP on macOS

  26 novembre 2020, par freddy

  I'm trying to stream my microphone input via HTTP using ffmpeg, so I can stream it in HTML. I run the following ffmpeg command :

  


  ffmpeg -f avfoundation -i ":1" -c:a libmp3lame -f mp3 -r 30 http://localhost:809

  


  It, however, crashes with the following error message :

  


  ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.27)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_4 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --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-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --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-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  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, avfoundation, from ':1':
  Duration: N/A, start: 3445.340045, bitrate: 22579 kb/s
    Stream #0:0: Audio: pcm_f32le, 44100 Hz, hexadecagonal, flt, 22579 kb/s
[tcp @ 0x7fa46ec96600] Connection to tcp://localhost:8090 failed: Connection refused
http://localhost:8090: Connection refused


  


  I've had success with streaming on that port using VLC, but it for some reason won't work using ffmpeg. Any ideas on how to fix this ?

  


• avfilter/vidstab : add option for file format specification

  22 octobre 2023, par Gyan Doshi

  avfilter/vidstab : add option for file format specification
  The vidstab library added support in Nov 2020 for writing/reading
  
  the transforms data in binary in addition to ASCII. The library default
  
  was changed to binary format but no changes were made to the AVfilters
  
  resulting in data file for writing or reading being always opened as text.
  
  This effectively broke the filters.
  Option added to vidstabdetect to specify file format and open files in
  
  both filters with the correct attributes.
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_vidstabdetect.c
  • [DH] libavfilter/vf_vidstabtransform.c