[FFmpeg-user] Meaning of ffprobe output
Ulf.Zibis at gmx.de
Tue Jan 29 03:16:53 EET 2019
Hi Carl Eugen,
Am 19.01.19 um 14:02 schrieb Carl Eugen Hoyos:
>> $ ffmpeg -i CYD_copy.vob -vf idet -f null -
>> ffmpeg version 4.1-static https://johnvansickle.com/ffmpeg/ Copyright
> Not supported here!
>> (c) 2000-2018 the FFmpeg developers
>> built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
> Not ok!
This recommendation comes from here:
So I used the release version 4.1 from here:
in the assumption, that it is more stable as the git build.
>> [Parsed_idet_0 @ 0x6e71900] Repeated Fields: Neither:114683 Top: 1
>> Bottom: 0
>> [Parsed_idet_0 @ 0x6e71900] Single frame detection: TFF: 18738 BFF:
>> 12770 Progressive: 42496 Undetermined: 40680
>> [Parsed_idet_0 @ 0x6e71900] Multi frame detection: TFF: 36759 BFF: 19705
>> Progressive: 58193 Undetermined: 27
> This is not conclusive, possibly mixed progressive - interlaced or
> interlaced with many scenes without movement.
> Visual inspection should clarify.
Does that mean, that my vob stream is partly interlaced and partly
I guess, TFF means top first frame and BFF bottom first frame, right?
This is weird, as the stream comes from a DVD which was recorded from a
VHS cassette with a hardware DVD recorder.
Also I do not understand, that after the transcoding to mp4 the numbers
are different. I interpret this, that the transcoding process does some
deinterlacing, but you say, the encoder does not. The vob with 114684
frames at 25 fps results in 76:27.36 length, but the resulting mp4 with
114502 frames is 76:20.08.
How can I understand all this?
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