[FFmpeg-user] exponential decay, is it possible?

[Michael Koch]

>
>> F:\xxx>c:/ffmpeg/ffmpeg -i temp%4d.jpg -vf lutyuv="y=0.9*val"
>> -frames 10 -q:v 1 -start_number 1 temp%4d.jpg
>
> FFmpeg does not edit files in-place. Input and output have to be 
> different.

Input and output are different. Input starts with number 0, and output 
starts with number 1.

>
> Besides,
>
> > Input #0, image2, from 'temp%4d.jpg':
> >   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
>
> FFmpeg only sees one image.

That's correct, at the beginning there is only one image temp0000.jpg
Is there any way to tell ffmpeg to write the output file temp0001.jpg 
before it reads the next input image which has the same filename?

Michael