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

[Carl Eugen Hoyos]

2018-12-20 15:48 GMT+01:00, Ulf Zibis <Ulf.Zibis at gmx.de>:
> Hi again,
>
> 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. To find this out, I describe how
> I created the video:
>
> The DVD was recorded by a hardware DVD-Recorder from the original VHS
> cassette several years ago by somebody unknown. I only have the DVD,
> which has several format errors, so it only can be played by a hardware
> DVD-Player or with VLC, other players report read errors. So I first
> ripped the DVD with dvd::rip. As result I got 23 VOB snippets, which
> were a kind of corrupted, as no player could display the snippets
> without errors. Then I concatenated them to 1 file with:
> ffmpeg -ss 00:03 -t 01:16:20 -i
> "concat:001-C001/CYD-001.vob|001-C002/CYD-001.vob|001-C003/CYD-001.vob|001-C004/CYD-001.vob|001-C005/CYD-001.vob|001-C006/CYD-001.vob|001-C007/CYD-001.vob|001-C008/CYD-001.vob|001-C009/CYD-001.vob|001-C010/CYD-001.vob|001-C011/CYD-001.vob|001-C012/CYD-001.vob|001-C013/CYD-001.vob|001-C014/CYD-001.vob|001-C015/CYD-001.vob|001-C016/CYD-001.vob|001-C017/CYD-001.vob|001-C018/CYD-001.vob|001-C019/CYD-001.vob|001-C020/CYD-001.vob|001-C021/CYD-001.vob|001-C022/CYD-001.vob|001-C023/CYD-001.vob"
> -movflags +faststart -c copy /media/Sicherung/Filme/CYD/ffmpeg/CYD_copy.vob
> The result was playable. In the console I saw a lot of sync and other
> errors which seemed to be corrected by ffmpeg.

I believe that the sync errors indicate that concatenation is not the
right way here.
Did you try mplayer -dumpstream?

Carl Eugen