Hallo! Ich habe mal wieder auseinanderlaufende Spuren. Ich hab das ganze jetzt wie beim letzten mal durch ffmpeg gejagt und auf der einen Spur bekomme ich tatsächlich irgendwelche Warnungen:

WMR128> ffmpeg -i WMR128-001.flac out.flac
ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 9.1.0 (clang-902.0.39.1)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  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, flac, from 'WMR128-001.flac':
  Duration: 04:38:01.56, start: 0.000000, bitrate: 301 kb/s
    Stream #0:0: Audio: flac, 48000 Hz, stereo, s16
Stream mapping:
  Stream #0:0 -> #0:0 (flac (native) -> flac (native))
Press [q] to stop, [?] for help
Output #0, flac, to 'out.flac':
  Metadata:
    encoder         : Lavf58.12.100
    Stream #0:0: Audio: flac, 48000 Hz, stereo, s16, 128 kb/s
    Metadata:
      encoder         : Lavc58.18.100 flac
[NULL @ 0x7fae41001200] sample/frame number mismatch in adjacent frames
[NULL @ 0x7fae41001200] sample/frame number mismatch in adjacent frames
[NULL @ 0x7fae41001200] sample/frame number mismatch in adjacent frames
size=  671663kB time=04:38:01.55 bitrate= 329.8kbits/s speed= 415x
video:0kB audio:671655kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001205%

Was nun?