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

[Ulf Zibis]

Hi,

Am 06.01.19 um 15:09 schrieb Carl Eugen Hoyos:
>
> Then please search the MPlayer manual for the option to
> specify the dvd device.

The correct command seems to be:
$ mplayer -nocache -dumpstream -dumpfile CYD_dump+nav.vob
dvdnav://1//dev/sr1

Now I get a file with 4.234.833.920 Bytes instead of 4.214.351.872 Bytes:
$ ffprobe CYD_dump+nav.vob
[.....]
Input #0, mpeg, from '/media/Sicherung/Filme/CYD/mplayer/CYD_dump+nav.vob':
  Duration: 00:01:03.16, start: 0.231578, bitrate: 536425 kb/s
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[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 #0:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Unsupported codec with id 100357 for input stream 0

>From the 4.214.351.872 Bytes file I get:
$ ffprobe CYD_dump.vob
[.....]
Input #0, mpeg, from '/media/Sicherung/Filme/CYD/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

Except the useless "Stream #0:0[0x1bf]: Data: dvd_nav_packet", the 2
files seem to be identical.

So it still remains the question from:
Am 20.12.18 um 15:48 schrieb Ulf Zibis:

> Am 20.12.18 um 01:20 schrieb Carl Eugen Hoyos:
>> I suspect your video does not start at "0".
> You may be right, so I'm wondering why.

So how can I set the start at "0"?

-Ulf