[FFmpeg-user] Why are these different?

[Paul B Mahol]

On Thu, Feb 8, 2024 at 1:23 AM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> On 07/02/2024 16.53, Paul B Mahol wrote:
> > 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
>
> Here ya go, Paul. Logs are attached.
>

Read logs and compare, use common sense, brain cells, logic and
intelligence.


>
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