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• Using ffmpeg for cutting mp3 in python -codec copy error

  2 novembre 2016, par Stijn Goethals

  def cut_file(file, start_time, end_time):
  
      """ Cut the mp3 file with start and end time. """
  
      output = file[:-4] + "_cut.mp3"
  
      try:
  
          os.remove(output)
  
      except Exception:
  
          pass
  
      p=Popen(["ffmpeg", "-i", file, "-c:a copy -ss", start_time, "-to", end_time, output], stdout=PIPE)
  
      p.communicate()
  
      os.remove(file)
  
      os.rename(output,file)
  
      return file

  When using this function for cutting a mp3 file I get error from ffmpeg. The error is :

  Unknown encoder ’0:07’

  Why doesn’t ffmpeg recognize the copy command when using Python ? Running the command in the shell doesn’t give me any errors.

  I have tried to change the order of the arguments but this give me the same sort of errors.

  I got the code out of the official documentation.

• Invalid data found when processing input for mp3 file in ffmpeg

  15 juillet 2023, par Sai Chaithanya

  My custom compiled FFmpeg build is unable to read mp3 files, suddenly. Interestingly, the custom compiled FFmpeg build generated the mp3 file. For the past 1 year, it was successfully reading the file. I checked with the official FFmpeg build, and it works, so at least the file is not corrupted.

  


  Official FFmpeg Build output :

  


  ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 11 (Ubuntu 11.3.0-1ubuntu1~22.04.1)
configuration: --arch=x86_64 --target-os=linux --disable-network --enable-small --disable-doc 
               --disable-manpages --enable-static --disable-shared --disable-ffprobe 
               --disable-ffplay --enable-lto --prefix=/home/greninja/Downloads/custom_build 
               --extra-cflags='-I/home/greninja/Downloads/custom_build/include -O3 -flto' 
               --extra-ldflags=-L/home/greninja/Downloads/custom_build/lib
libavutil      58.  2.100 / 58.  2.100
libavcodec     60.  3.100 / 60.  3.100
libavformat    60.  3.100 / 60.  3.100
libavdevice    60.  1.100 / 60.  1.100
libavfilter     9.  3.100 /  9.  3.100
libswscale      7.  1.100 /  7.  1.100
libswresample   4. 10.100 /  4. 10.100
Input #0, mp3, from './test.mp3':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6mp41
    encoder         : Lavf59.33.100
Duration: 00:03:07.09, start: 0.025057, bitrate: 192 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 192 kb/s
  Metadata:
    encoder         : Lavc59.46
At least one output file must be specified


  


  My Custom FFmpeg build output :

  


  ffmpeg version N-108341-gb1a68127bb Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
configuration: --arch=x86_64 --target-os=linux --disable-everything --disable-network 
               --disable-autodetect --enable-small --disable-debug --disable-doc 
               --disable-manpages --enable-static --disable-shared 
               --enable-decoder='aac*,ac3*,opus,vorbis,mjpeg' 
               --enable-demuxer='mov,m4v,matroska,image2' --enable-protocol=file 
               --enable-muxer='mp3,mp4,webm,null' --enable-libmp3lame 
               --enable-encoder=libmp3lame --enable-filter=aresample --enable-logging 
               --enable-pthreads --enable-parser='vorbis,opus,vp9,vp8,mpegaudio,mpegvideo,mpeg4video,ac3*,aac*,mjpeg,h264' 
               --disable-ffprobe --disable-ffplay --enable-lto 
               --prefix=/home/wade/Downloads/custom_build 
               --extra-cflags='-I/home/wade/Downloads/custom_build/include -O3 -flto' 
               --extra-ldflags=-L/home/wade/Downloads/custom_build/lib
libavutil      57. 36.102 / 57. 36.102
libavcodec     59. 46.100 / 59. 46.100
libavformat    59. 33.100 / 59. 33.100
libavdevice    59.  8.101 / 59.  8.101
libavfilter     8. 49.100 /  8. 49.100
libswscale      6.  8.112 /  6.  8.112
libswresample   4.  9.100 /  4.  9.100
./test.mp3: Invalid data found when processing input


  


  What configuration am I missing ?

  


• compile ffmpeg with x264

  29 juillet 2020, par y2kbug

  I need ffmpeg with hardware acceleration.
I am compiling ffmpeg following this guide :
https://gist.github.com/Brainiarc7/eb45d2e22afec7534f4a117d15fe6d89

  



  x264 never works after compile.
I follow the official guide, adding "—enable-shared", compile again, still no luck.
https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

  



  Simply installing libx264-dev does not work as well.

  



  


  $ ldd /bin/ffmpeg | grep x264 libx264.so.155 => not found

  


  



  Does anyone know how to make x264 work ?
Thanks.