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• trying to convert mp3 to wav

  7 décembre 2018, par Aakash aggarwal

  I am trying to convert mp3 file to wav format using pyaudio but getting an error
  My code

  from pydub import AudioSegment
  
  sound = AudioSegment.from_mp3("v1.mp3")
  
  sound.export("a.wav", format="wav")

  and I am getting error in line 2 as follow

  CouldntDecodeError : Decoding failed. ffmpeg returned error code : 1

  Output from ffmpeg/avlib :

  b"ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers\n built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.10) 20160609\n configuration : —prefix=/usr —extra-version=0ubuntu0.16.04.1 —build-suffix=-ffmpeg —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —cc=cc —cxx=g++ —enable-gpl —enable-shared —disable-stripping —disable-decoder=libopenjpeg —disable-decoder=libschroedinger —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-libmodplug —enable-libmp3lame —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-librtmp —enable-libschroedinger —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-libxvid —enable-libzvbi —enable-openal —enable-opengl —enable-x11grab —enable-libdc1394 —enable-libiec61883 —enable-libzmq —enable-frei0r —enable-libx264 —enable-libopencv\n libavutil 54. 31.100 / 54. 31.100\n libavcodec 56. 60.100 / 56. 60.100\n libavformat 56. 40.101 / 56. 40.101\n libavdevice 56. 4.100 / 56. 4.100\n libavfilter 5. 40.101 / 5. 40.101\n libavresample 2. 1. 0 / 2. 1. 0\n libswscale 3. 1.101 / 3. 1.101\n libswresample 1. 2.101 / 1. 2.101\n libpostproc 53. 3.100 / 53. 3.100\n[mp3 @ 0x2446020] Header missing\n Last message repeated 1045 times\n[mp3 @ 0x243d060] decoding for stream 0 failed\n[mp3 @ 0x243d060] Could not find codec parameters for stream 0 (Audio : mp3, 0 channels, s16p) : unspecified frame size\nConsider increasing the value for the ’analyzeduration’ and ’probesize’ options\nv1.mp3 : could not find codec parameters\nInput #0, mp3, from ’v1.mp3’ :\n Duration : N/A, start : 0.000000, bitrate : N/A\n Stream #0:0 : Audio : mp3, 0 channels, s16p\n[abuffer @ 0x2449660] Value inf for parameter ’time_base’ out of range [0 - 2.14748e+09]\n Last message repeated 3 times\n[abuffer @ 0x2449660] Error setting option time_base to value 1/0.\n[graph 0 input from stream 0:0 @ 0x2449540] Error applying options to the filter.\nError opening filters !\n"

• ffmpeg : unable to merge valid mp4 and mp3 together

  3 décembre 2018, par yarek

  I try to merge 2 files
  1 mp4 video + 1 mp3 files (both are ok and are playable inside chrome or firefox)

  mediainfo yarek.mp4
  
  General
  
  Complete name                            : yarek.mp4
  
  Format                                   : MPEG-4
  
  Format profile                           : Base Media
  
  Codec ID                                 : isom (isom/iso2/avc1/mp41)
  
  File size                                : 86.7 KiB
  
  Duration                                 : 5 s 263 ms
  
  
  
  mediainfo yarek.mp3
  
  General
  
  Complete name                            : yarek.mp3
  
  Format                                   : MPEG Audio
  
  File size                                : 83.9 KiB
  
  Overall bit rate mode                    : Variable
  
  Writing library                          : Lavf57.56.101

  I run :

  ffmpeg -i yarek.mp4 -i yarek.mp3 output.mp4

  Gives me that error :

  buffer @ 0x55656c11b0e0] Unable to parse option value "-1" as pixel format
  
      Last message repeated 1 times
  
  [buffer @ 0x55656c11b0e0] Error setting option pix_fmt to value -1.
  
  [graph 0 input from stream 0:0 @ 0x55656c11aa40] Error applying options to the filter.

  Same problem when I try to extract a JPEG form the mp4 (the mp4 is valid and can be opened within VLC or inside Chrome or Firefow)

  /var/www/html/record# ffmpeg -y -i "yarek.mp4" -ss "1" -vframes 1 -q:v 2 output.jpg
  
  ffmpeg version 3.2.12-1~deb9u1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1' --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-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55d221642ee0] Missing key frame while reordering index according to edit list
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55d221642ee0] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 640x480, 128 kb/s): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'yarek.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.101
  
      comment         : {"t": "v", "c": "h264", "s": 1543853355450975, "u": 1543853355472477}
  
    Duration: 00:00:22.73, bitrate: 130 kb/s
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none, 640x480, 128 kb/s, 14.69 fps, 15 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [buffer @ 0x55d221663420] Unable to parse option value "-1" as pixel format
  
      Last message repeated 1 times
  
  [buffer @ 0x55d221663420] Error setting option pix_fmt to value -1.
  
  [graph 0 input from stream 0:0 @ 0x55d221642d60] Error applying options to the filter.
  
  Error opening filters!

• FFMPEG adds extra contents to the beginning of the file, when converting OGG audio to MP3

  3 décembre 2018, par PBM

  I use the following ffmpeg -i   to convert ogg music files to mp3. I, however, realized that the resulting mp3 files on some ogg files are slightly longer, and includes the repetition of the first half a second of the original file in the beginning. (Which is quite annoying when listening to the MP3s).

  Anybody else faced similar issues ?

  FYI, I am using ffmpeg version 4.0.3, which uses libmp3lame as the encoder for MP3 output.

  ---

  As requested in the comments, here is the full log of @ffmpeg@

  $ ffmpeg -i track.ogg track.mp3
  
  ffmpeg version 4.0.3 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 8 (GCC)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, ogg, from 'track.ogg':
  
    Duration: 00:04:47.11, start: 0.000000, bitrate: 112 kb/s
  
      Stream #0:0: Audio: vorbis, 44100 Hz, stereo, fltp, 112 kb/s
  
      Metadata:
  
        ARTIST          : artist
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vorbis (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  Output #0, mp3, to 'track.mp3':
  
    Metadata:
  
      TSSE            : Lavf58.12.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
  
      Metadata:
  
        ARTIST          : artist
  
        encoder         : Lavc58.18.100 libmp3lame
  
  [ogg @ 0x5645711ebdc0] Invalid picture type: -2555935.
  
  [ogg @ 0x5645711ebdc0] Could not read mimetype from an attached picture.
  
  [ogg @ 0x5645711ebdc0] Invalid picture type: -2555935.
  
  [ogg @ 0x5645711ebdc0] Could not read mimetype from an attached picture.
  
  size=    4497kB time=00:04:47.79 bitrate= 128.0kbits/s speed=50.8x    
  
  video:0kB audio:4497kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005494%

  Something that is strange is the error message Invalid picture type whereas the ogg file does not contain any cover-art photo. And to see the difference of the lengths :

  $ soxi -D track.ogg 
  
  287.111837
  
  $ soxi -D track.mp3 
  
  287.817007