[FFmpeg-user] WAV to FLAC md5 mismatch errors

[Chase Walker]

Hello,

I am using FFMPEG to convert WAV files to FLAC files and I am getting MD5
mismatch errors when running the converted files through AudioTester.  Now,
it doesn't happen for all converted files, just some.  Conversely, when I
use the flac encoding tool to encode the files, they do not produce the md5
mismatch error.  Does anyone have any insights on this?  Here is the
corresponding commands and output:

ffmpeg -i 10casualties-2-1422667268-1-1426282002-1-1427332463.wav -y
flac_encoding_test.flac
ffmpeg version N-44407-g8bc8001-   http://johnvansickle.com/ffmpeg/
 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (Debian 4.9.2-10)
  configuration: --enable-gpl --enable-version3 --disable-shared
--disable-debug --enable-runtime-cpudetect --enable-libmp3lame
--enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex
--enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig
--enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-gray --enable-libopenjpeg --enable-libopus --enable-libass
--enable-gnutls --enable-libvidstab --cc=gcc-4.9
  libavutil      54. 18.100 / 54. 18.100
  libavcodec     56. 22.100 / 56. 22.100
  libavformat    56. 22.100 / 56. 22.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 11.100 /  5. 11.100
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, wav, from
'10casualties-2-1422667268-1-1426282002-1-1427332463.wav':
  Duration: 00:02:17.27, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2
channels, s16, 1411 kb/s
Output #0, flac, to 'flac_encoding_test.flac':
  Metadata:
    encoder         : Lavf56.22.100
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16, 128 kb/s
    Metadata:
      encoder         : Lavc56.22.100 flac
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> flac (native))
Press [q] to stop, [?] for help
size=   17278kB time=00:02:17.26 bitrate=1031.1kbits/s
video:0kB audio:17270kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.046867%

****CHECKING FILE WITH FLAC****

flac -t flac_encoding_test.flac

flac 1.2.1, Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh
Coalson
flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you are
welcome to redistribute it under certain conditions.  Type `flac' for
details.

flac_encoding_test.flac: ERROR, MD5 signature mismatch