[FFmpeg-user] How to extract 1 frame as JPEG per minute

[Ulf Zibis]

... from the dump, I get:

$ ls -l mplayer/CYD_dump.vob
-rwxrwxrwx 1 root root 4214351872 Jan  2 21:50 mplayer/CYD_dump.vob
$ ffprobe mplayer/CYD_dump.vob
ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the
FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
[.....]
Input #0, mpeg, from 'mplayer/CYD_dump.vob':
  Duration: 00:01:03.16, start: 0.231578, bitrate: 533831 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg,
top first), 704x576 [SAR 12:11 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s

>From the ffmpeg remux result I get:

$ ls -l dvdrip/CYD_ffmpeg-copy.vob
-rwxrwxrwx 1 root root 4186640384 Jan  2 17:16 dvdrip/CYD_ffmpeg-copy.vob
$ ffprobe dvdrip/CYD_ffmpeg-copy.vob
ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the
FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
[.....]
Input #0, mpeg, from 'dvdrip/CYD_ffmpeg-copy.vob':
  Duration: 01:19:53.60, start: 0.540000, bitrate: 6987 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg,
top first), 704x576 [SAR 12:11 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s

In the latter, it seems, the video starts at 0.54. Doese this matter?
How can I set it to 0.0?

Thanks
-Ulf