vorbis Extradata corrupt

[ponpon]

i found a vorbis file not recognized by ffmpeg.
thank you.

ffmpeg -i sample.avi
ffmpeg version N-90810-g153e920892 Copyright (c) 2000-2018 the FFmpeg developers
  built with clang version 5.0.1 (tags/RELEASE_501/final)
  configuration: --prefix=/sw --cc=clang-mp-5.0 --cxx=clang++-mp-5.0 --disable-shared --enable-static --enable-gpl --enable-version3 --enable-nonfree --enable-pthreads --optflags=-Ofast --extra-cflags='-I/sw/include -I/opt/local/include ' --extra-ldflags=' -L/sw/lib -L/opt/local/lib -fopenmp' --extra-ldsoflags='-L/sw/lib -L/opt/local/lib -static--target-os=darwin' --arch=x86_64 --cpu=kabylake --enable-avresample --enable-libfdk-aac --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libfreetype --enable-gcrypt --enable-gmp --enable-openssl --enable-librtmp --enable-libass --enable-fontconfig --enable-libfribidi --enable-libbluray --enable-libdc1394 --enable-libmodplug --enable-lzma --enable-libx264 --enable-libx265 --enable-libzimg --enable-libvidstab --enable-libsoxr --enable-libsmbclient --enable-libcdio --enable-libtesseract --enable-opengl --enable-opencl --pkg-config-flags=' --libs --static'
  libavutil      56. 15.100 / 56. 15.100
  libavcodec     58. 19.100 / 58. 19.100
  libavformat    58. 13.100 / 58. 13.100
  libavdevice    58.  4.100 / 58.  4.100
  libavfilter     7. 19.100 /  7. 19.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
[avi @ 0x7ff3fe811000] Estimating duration from bitrate, this may be inaccurate
[avi @ 0x7ff3fe811000] Could not find codec parameters for stream 0 (Audio: none (qg[0][0] / 0x6771), 48000 Hz, 2 channels, 128 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, avi, from 'sample.avi':
  Metadata:
    encoder         : Lavf58.13.100
  Duration: 00:00:01.00, start: 0.000000, bitrate: 173 kb/s
    Stream #0:0: Audio: none (qg[0][0] / 0x6771), 48000 Hz, stereo, 128 kb/s
    Metadata:
      title           : Microsoft Waveform: Camtasia Recorder_convert111e2de.wav
At least one output file must be specified

ffmpeg -c:a vorbis -i sample.avi 
ffmpeg version N-90810-g153e920892 Copyright (c) 2000-2018 the FFmpeg developers
  built with clang version 5.0.1 (tags/RELEASE_501/final)
  configuration: --prefix=/sw --cc=clang-mp-5.0 --cxx=clang++-mp-5.0 --disable-shared --enable-static --enable-gpl --enable-version3 --enable-nonfree --enable-pthreads --optflags=-Ofast --extra-cflags='-I/sw/include -I/opt/local/include ' --extra-ldflags=' -L/sw/lib -L/opt/local/lib -fopenmp' --extra-ldsoflags='-L/sw/lib -L/opt/local/lib -static--target-os=darwin' --arch=x86_64 --cpu=kabylake --enable-avresample --enable-libfdk-aac --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libfreetype --enable-gcrypt --enable-gmp --enable-openssl --enable-librtmp --enable-libass --enable-fontconfig --enable-libfribidi --enable-libbluray --enable-libdc1394 --enable-libmodplug --enable-lzma --enable-libx264 --enable-libx265 --enable-libzimg --enable-libvidstab --enable-libsoxr --enable-libsmbclient --enable-libcdio --enable-libtesseract --enable-opengl --enable-opencl --pkg-config-flags=' --libs --static'
  libavutil      56. 15.100 / 56. 15.100
  libavcodec     58. 19.100 / 58. 19.100
  libavformat    58. 13.100 / 58. 13.100
  libavdevice    58.  4.100 / 58.  4.100
  libavfilter     7. 19.100 /  7. 19.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
[vorbis @ 0x7f9f1e010a00] Extradata corrupt.
[avi @ 0x7f9f1d800000] Failed to open codec in avformat_find_stream_info
[Vorbis parser @ 0x7f9f1cf00ec0] Extradata corrupt.
[vorbis @ 0x7f9f1e010a00] Extradata corrupt.
[avi @ 0x7f9f1d800000] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, avi, from '/Users/m/test/sample.avi':
  Metadata:
    encoder         : Lavf58.13.100
  Duration: 00:00:01.00, start: 0.000000, bitrate: 173 kb/s
    Stream #0:0: Audio: vorbis (qg[0][0] / 0x6771), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      title           : Microsoft Waveform: Camtasia Recorder_convert111e2de.wav
At least one output file must be specified

mediainfo  sample.avi
General
Complete name                            : sample.avi
Format                                   : AVI
Format/Info                              : Audio Video Interleave
File size                                : 21.3 KiB
Overall bit rate mode                    : Constant
Writing application                      : Lavf58.13.100

Audio
ID                                       : 0
Format                                   : Vorbis
Format version                           : Mode 3+
Format settings, Floor                   : 1
Codec ID                                 : 6771
Source duration                          : 1 s 0 ms
Bit rate mode                            : Constant
Bit rate                                 : 128 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Compression mode                         : Lossy
Stream size                              : 15.6 KiB (74%)
Title                                    : Microsoft Waveform: Camtasia Recorder_convert111e2de.wav
Writing application                      : vorbis.acm
Writing library                          : libVorbis 1.0 RC3 (UTC 2001-12-31)

[Carl Eugen Hoyos]

Looks like a duplicate of ticket #1690.