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

[Mark Filipak (ffmpeg)]

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.


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."