[FFmpeg-user] ppsrc=1 decimation doesn't work or isn't correct or throws exception

[Paul B Mahol]

On Tue, Dec 22, 2020 at 1:28 AM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> Here is a link to the bug report package:
>
> https://www.dropbox.com/s/euz4q3daogulhwi/ERROR%20ppsrc%3D1%20DECIMATION%20DOESN%27T%20WORK%20OR%20ISN%27T%20CORRECT%20OR%20THROWS%20EXCEPTION.zip?dl=0
>
> A friend assures me that anyone can download the zip file (though inside
> dropbox it appears others
> can only view the files).
>
> Everything you developers need are in the zip. But do let me know if
> there's any problem.
>
>
I think I fixed this, feel free to test with latest ffmpeg that have
decimate filter fix.


>
> On 12/21/2020 07:13 PM, Mark Filipak (ffmpeg) wrote:
> > I'm trying to file a bug report but there appears to be no way to get
> the report to you. I have some
> > very short video samples and the ffmpeg report files. I spent 4 hours on
> this to make it so clear it
> > will be very easy to replicate. But trac.ffmpeg.org won't accept it.
> >
> > ...Frustrated. Four hours. What a waste of my time.
> >
> > On 12/21/2020 02:52 PM, Mark Filipak (ffmpeg) wrote:
> >> Win10-1803.
> >>
> >> The sources & fault documentaion files are here: To be determined --
> trac.ffmpeg.org rejects it,
> >> too big (2,847,812 bytes) -- got any suggestions?
> >>
> >>
> >> RUNME.CMD : ffmpeg -i preprocessed.mkv -i source.mkv -filter_complex
> "decimate='ppsrc=1'"
> >> target.mkv -y
> >>
> >> I ran RUNME.CMD 40 times.
> >>
> >> 33 times, RUNME.CMD didn't do anything: target.mkv = 0 bytes.
> >>
> >> 3 times, RUNME.CMD seemed to work but the decimation was wrong.
> >> source.mkv frames:           1018 1019 1020 1021 1022 1023 1024 1025
> 1026 1027 1028 1029
> >> target.mkv frames are:       1018      1020 1021 1022 1023 1024
> 1025      1027 1028 1029
> >> target.mkv frames should be: 1018      1020 1021 1022 1023      1025
> 1026 1027 1028
> >>
> >> 'source.mkv frames 1018-1029.png' shows a source fragment that was made
> prior to frame number
> >> insertion but including my structure notation.
> >>
> >> 4 times, RUNME.CMD threw an "ffmpeg.exe - Application Error" exception:
> >> "The instruction at 0x00007FF6086540D9 referenced memory at
> 0xFFFFFFFFFFFFFFFF. The memory could
> >> not be read."
> >> or
> >> "The instruction at 0x0000000000000000 referenced memory at
> 0x0000000000000000. The memory could
> >> not be written."
> >> or
> >> "The exception unknown software exception (0x40000015) occurred in the
> application at location
> >> 0x00007FF6083E2424."
>
>
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