[FFmpeg-user] Re-encoding mkv files from makemkv

[James Board]

I'm trying to re-encode an MKV file that I originally created with makemkv from the original BluRay disc.  My ffmpeg command is:
    ffmpeg-4.1.2-amd64-static/ffmpeg -y -i Twin_Peaks-_A_Limited_Event_Series_-_Disc_2_t01.mkv -c:a copy -c:v libx264  -preset slow -crf 20 Twin_Peaks-_A_Limited_Event_Series_-_Disc_2_t01_RECODE.mkv

The error is
    Too many packets buffered for output stream 0:1.
    Conversion failed!

I just want to re-encode these files to save disk space.  Does anyone know how I can resolve the above error?  The full error message is below.
Thanks


--------------------------------------------------------------------
ffmpeg version 4.1.2-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-gray --enable-libaom --enab!
  libavutil     56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat     58. 20.100 / 58. 20.100
  libavdevice     58.  5.100 / 58.  5.100
  libavfilter      7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample      3.  3.100 /  3.  3.100
  libpostproc     55.  3.100 / 55.  3.100
[matroska,webm @ 0x5bf2480] Could not find codec parameters for stream 3 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, matroska,webm, from 'Twin_Peaks-_A_Limited_Event_Series_-_Disc_2_t01.mkv':
  Metadata:
    title        : Twin Peaks: A Limited Event Series - Disc 2
    encoder        : libmakemkv v1.16.4 (1.3.10/1.5.2) x86_64-linux-gnu
    creation_time   : 2021-10-25T15:19:56.000000Z
  Duration: 00:56:57.50, start: 0.000000, bitrate: 37009 kb/s
    Chapter #0:0: start 0.000000, end 99.099000
    Metadata:
      title          : Chapter 01
    Chapter #0:1: start 99.099000, end 571.153917
    Metadata:
      title          : Chapter 02
    Chapter #0:2: start 571.153917, end 1180.512667
    Metadata:
      title          : Chapter 03
    Chapter #0:3: start 1180.512667, end 2008.840167
    Metadata:
      title          : Chapter 04
    Chapter #0:4: start 2008.840167, end 2526.732542
    Metadata:
      title          : Chapter 05
    Chapter #0:5: start 2526.732542, end 3312.851208
    Metadata:
      title          : Chapter 06
    Chapter #0:6: start 3312.851208, end 3417.497417
    Metadata:
      title          : Chapter 07
    Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
    Metadata:
      BPS-eng          : 33970403
      DURATION-eng    : 00:56:57.497416666
      NUMBER_OF_FRAMES-eng: 81938
      NUMBER_OF_BYTES-eng: 14511719069
      SOURCE_ID-eng   : 001011
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.16.4 linux(x64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-10-25 15:19:56
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
    Stream #0:1(eng): Audio: truehd, 96000 Hz, 5.1(side), s32 (24 bit) (default)
    Metadata:
      title          : Surround 5.1
      BPS-eng          : 2360136
      DURATION-eng    : 00:56:56.955000000
      NUMBER_OF_FRAMES-eng: 4100346
      NUMBER_OF_BYTES-eng: 1008060054
      SOURCE_ID-eng   : 001100
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.16.4 linux(x64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-10-25 15:19:56
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s
    Metadata:
      title          : Surround 5.1
      BPS-eng          : 640000
      DURATION-eng    : 00:56:56.992000000
      NUMBER_OF_FRAMES-eng: 106781
      NUMBER_OF_BYTES-eng: 273359360
      SOURCE_ID-eng   : 001100
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.16.4 linux(x64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-10-25 15:19:56
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
    Stream #0:3(eng): Subtitle: hdmv_pgs_subtitle    Metadata:
      BPS-eng          : 26434
      DURATION-eng    : 00:56:36.622395833
      NUMBER_OF_FRAMES-eng: 1518
      NUMBER_OF_BYTES-eng: 11223488
      SOURCE_ID-eng   : 001200
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.16.4 linux(x64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-10-25 15:19:56
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
Too many packets buffered for output stream 0:1.
Conversion failed!