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• Soft-encoding of subtitles into MPEG-4 file

  7 octobre 2017, par Pygmalion

  It is a well-known fact that one can soft-encode subtitles into MKV files, that is by playing MKV file with soft-endoded subtitles, one can turn them on or off.

  My questions is, is it possible to soft-encode subtitles into MP4 files ? I feel like if I am searching for a Yeti. Googling this in 99% cases returns methods that actually hard-encode subtitles and in 1% cases non-working solutions. I tried ffmpeg, avidemux and dozen of other online and offline solutions.

  The closest I could get to the solution was

  Use ffmpeg to add text subtitles

  however it does not work. What I consistently get is

  Packet with invalid duration -XXXX in stream 1

  error.

  Therefore, can someone give me authoritative answer : Is it possible or is it not possible to soft-encode subtitles in MP4 ? Does anyone know any working solution ? Thanks.

  EDIT : Since it is a rather short video (cca. 1 minute) and rather short subtitles, I can provide them for testing.

  Here is the full log for my ffmpeg command :

  ffmpeg version 2.8.4 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
  le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
  able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
  
  ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
   --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
  
  e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-zlib
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1-1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:01:14.94, start: 0.133000, bitrate: 278 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x480 [
  
  SAR 1:1 DAR 3:2], 144 kb/s, 29.96 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(unk): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 12
  
  8 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, srt, from '1-1.srt':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Subtitle: subrip
  
  File '1-1test.mp4' already exists. Overwrite ? [y/N] y
  
  [mp4 @ 04ea37c0] Codec for stream 0 does not use global headers but container fo
  
  rmat requires global headers
  
  [mp4 @ 04ea37c0] Codec for stream 1 does not use global headers but container fo
  
  rmat requires global headers
  
  Output #0, mp4, to '1-1test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 720x480 [SA
  
  R 1:1 DAR 3:2], q=2-31, 144 kb/s, 29.96 fps, 29.97 tbr, 30k tbn, 30k tbc (defaul
  
  t)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(unk): Audio: mp3 (i[0][0][0] / 0x0069), 48000 Hz, stereo, 128 kb
  
  /s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2: Subtitle: mov_text ([8][0][0][0] / 0x0008)
  
      Metadata:
  
        encoder         : Lavc56.60.100 mov_text
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (subrip (srt) -> mov_text (native))
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 04ea37c0] Packet with invalid duration -5232 in stream 1
  
  frame= 2245 fps=0.0 q=-1.0 Lsize=    2550kB time=00:01:14.92 bitrate= 278.8kbits
  
  /s
  
  video:1320kB audio:1171kB subtitle:1kB other streams:0kB global headers:0kB muxi
  
  ng overhead: 2.340987%

• Extracting Subtitles using FFMPEG (Unsupported subtitles codec : eia_608)

  4 octobre 2017, par Marian Montagnino

  The info for the input file is :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cpcdemo.mov':
  
  Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      encoder         : CoreMediaAuthoring 700, CoreMedia 484.11, i386
  
  Duration: 00:01:45.90, start: 0.000000, bitrate: 940 kb/s
  
      Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 131 kb/s (default)
  
      Metadata:
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      handler_name    : Apple Alias Data Handler
  
      Stream #0:1: Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 480x270 [SAR 1:1 DAR 16:9], 800 kb/s, 23.98 fps, 23.98 tbr, 23976 tbn, 47952 tbc (default)
  
      Metadata:
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Subtitle: eia_608 (c608 / 0x38303663), 480x270, 4 kb/s (default)
  
      Metadata:
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      handler_name    : Apple Alias Data Handler

  And shows that stream #0:2 contains subtitles in eia_608 format. Using the following command to extract those subtitles into the output.srt file :

  ffmpeg -i cpcdemo.mov -map 0:2 -c:s copy output.srt

  We get the following output :

  ffmpeg version N-85692-g78a5fc4 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-11)
  
  configuration: --prefix=/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build/include --extra-ldflags=-L/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build/lib --bindir=/tmp/gm-ffmpeg-1.0.4/BUILDROOT/gm-ffmpeg-1.0.4-1.el7.centos.x86_64/opt/graymeta/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
  libavutil      55. 61.100 / 55. 61.100
  
  libavcodec     57. 93.100 / 57. 93.100
  
  libavformat    57. 72.101 / 57. 72.101
  
  libavdevice    57.  7.100 / 57.  7.100
  
  libavfilter     6. 87.100 /  6. 87.100
  
  libswscale      4.  7.101 /  4.  7.101
  
  libswresample   2.  8.100 /  2.  8.100
  
  libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cpcdemo.mov':
  
  Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      encoder         : CoreMediaAuthoring 700, CoreMedia 484.11, i386
  
  Duration: 00:01:45.90, start: 0.000000, bitrate: 940 kb/s
  
      Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 131 kb/s (default)
  
      Metadata:
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      handler_name    : Apple Alias Data Handler
  
      Stream #0:1: Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 480x270 [SAR 1:1 DAR 16:9], 800 kb/s, 23.98 fps, 23.98 tbr, 23976 tbn, 47952 tbc (default)
  
      Metadata:
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Subtitle: eia_608 (c608 / 0x38303663), 480x270, 4 kb/s (default)
  
      Metadata:
  
      creation_time   : 2010-06-23T17:51:49.000000Z
  
      handler_name    : Apple Alias Data Handler
  
  File 'output.srt' already exists. Overwrite ? [y/N] y
  
  [srt @ 0x259c460] Unsupported subtitles codec: eia_608
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
  Stream #0:2 -> #0:0 (copy)
  
      Last message repeated 1 times

  It states that eis_608 is an unsupported codec, except I see that it’s listed as a supported codec under :

  ffmpeg -codecs

  Any possible reasons why this may be failing ?

• ffmpeg adding ass subtitles : error initializing filter 'subtitles' with args ''

  30 décembre 2023, par user5609622

  So I want to convert my mkv files to mp4 with hardcoded subs

  



  While this works fine :

  



  ffmpeg.exe -i "[X] File - 1 [Y].mkv" -c:v libx264 -preset veryfast -b:v 2750k -pass 1 -c:a aac "file_out.mp4"


  



  When I want to add the ASS subtitles (from the same MKV file) like so :

  



  ffmpeg.exe -i "[X] File - 1 [Y].mkv" -vf subtitles="[X] File - 1 [Y].mkv" -c:v libx264 -preset veryfast -b:v 2750k -pass 1 -c:a aac "file_out.mp4"


  



  the following error is produced :

  



  [Parsed_subtitles_0 @ 00000000259c840] No filename provided!
[AVFilterGraph @ 000000000094dc20] Error initializing filter 'subtitles' with args ''


  



  It seems like somehow it didn't pick up the filename for the subtitles. So what's the deal with that ?