[FFmpeg-user] Why are these different?

[Paul B Mahol]

On Wed, Feb 7, 2024 at 10:28 PM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> Hi Carl,
>
> On 07/02/2024 13.56, Carl Zwanzig wrote:
> > On 2/7/2024 10:34 AM, Mark Filipak wrote:
> >> Okay. Why are they different?
> >
> > Because the containers are different? An mp4 container is not the same
> as an mkv (or avi or mpeg),
> > they must have different demuxers.
>
> They are the same source, same container. The only difference is command.
>
> ffmpeg -ss 20.061708333 -copyts -i %SOURCE% -map 0 -c copy -sn -dn
> -muxdelay 0 %TARGET%
> ffmpeg -copyts -i %SOURCE% -map 0 -ss 20.061708333 -c copy -sn -dn
> -muxdelay 0 %TARGET%
>
> Why do the results differ? They're not a little different. They're very
> different. The DTSs differ.
> The PTSs differ. The cutting points differ by a couple hundred frames.
> Even some of the packet
> lengths differ! This is serious.
>
> I can't tell if the GOPs differ -- DTS-sorted v PTS-sorted -- because it's
> impossible to correlate
> 'framecrc' results and 'showinfo' results.
>
>
use -v debug

One of them IIRC uses trim filters for seeking....

--Mark.
>
>
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