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

[Takenori Sato]

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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