[FFmpeg-user] tried scene extractions, but "Output file is empty, nothing was encoded"

[Takenori Sato]

>> You could also test mpdecimate with very high
>> custom values, see:
>> https://ffmpeg.org/ffmpeg-filters.html#mpdecimate
>
> Thanks. I will try both.

mpdecimate=hi=4096:lo=2048

This gave me what I wanted.

Thanks!

On Fri, Jan 8, 2016 at 9:25 AM, Takenori Sato <tsato at cloudian.com> wrote:
> Hi Carl,
>
> Thanks for your answer.
>
>> Your video does not contain a scene change;-(
>
> Ouch!
>
> Perhaps, I misunderstood "scene change".
>
> It is a test surveillance camera.
> So mostly no change.
> I wanted to get images when people passed by.
>
>> The following does approximately what you want
>> but I am not sure if the select filter is
>> appropriate at all:
>> -vf select='gt(scene\,0.03)'
>
> I see. Then, by lowering the threshold,
> I would get, at least, some images.
>
>> You could also test mpdecimate with very high
>> custom values, see:
>> https://ffmpeg.org/ffmpeg-filters.html#mpdecimate
>
> Thanks. I will try both.
>
> - Takenori
>
> On Thu, Jan 7, 2016 at 6:09 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>> Takenori Sato <tsato <at> cloudian.com> writes:
>>
>>> I tried to get scene changes with the following
>>> command, but failed to extract any scenes.
>>
>> Your video does not contain a scene change;-(
>>
>> The following does approximately what you want
>> but I am not sure if the select filter is
>> appropriate at all:
>> -vf select='gt(scene\,0.03)'
>> You could also test mpdecimate with very high
>> custom values, see:
>> https://ffmpeg.org/ffmpeg-filters.html#mpdecimate
>>
>> Carl Eugen
>>
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