[FFmpeg-user] Closed Captions for zone 1 DVD

[PPRJ01]

Hi All,

I don't understand why neither ffmpeg nor ffprobe detect presence of closed captions within MP4/H.264 in some video streams when VLC does.

Let me explain this... In the past 20 years, I have been working in several countries over the world and I bought official DVDs. Not duplicates ;-) I ripped them first to VOB and recently converted them to MP4/H.264 with ffmpeg without using the "-a53cc" option.

Reminder : when running ffmpeg and ffprobe, a few lines are written first to stderr. The words "Closed Captions", when present, indicate that the video stream contains closed captions.

==> The point is that ffmpeg/ffprobe do not show closed captions existence for MP4/H.264 files that come from ZONE 1 DVDs but VLC does and displays them.

==> Conversely, for zone 2 DVD, ffmpeg/ffprobe work properly.

==> Do you know why this happens ???

I am currently using a Windows 10 version of ffmpeg/ffprobe. Please see the details below with a DVD, bought in zone 1, that contains closed captions.

 

Best rgds


________________________________________

ffprobe version 4.1 Copyright (c) 2007-2018 the FFmpeg developers
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  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
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Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2005_Executive decision_2h08m35_en.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : Executive decision
    encoder         : Lavf58.20.100
  Duration: 02:08:35.08, start: 0.000000, bitrate: 1813 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 1538 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:2(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      handler_name    : SoundHandler
    Stream #0:3(spa): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x480, 2 kb/s (default)
    Metadata:
      handler_name    : SubtitleHandler
    Stream #0:4(spa): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x480, 2 kb/s
    Metadata:
      handler_name    : SubtitleHandler
    Stream #0:5(fre): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x480, 1 kb/s
    Metadata:
      handler_name    : SubtitleHandler
    Stream #0:6(fre): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x480, 1 kb/s
    Metadata:
      handler_name    : SubtitleHandler