[FFmpeg-user] backgroundkey filter

[Bacon At Taha]

Thank you very much Paul!

This info is very helpful.

Erik
Sent from my iPhone

> On Jun 19, 2024, at 03:03, Paul B Mahol <onemda at gmail.com> wrote:
> 
> On Wed, Jun 19, 2024 at 1:54 AM Erik Beck <bacon at tahoma.com> wrote:
> 
>> Hi all,
>> 
>> I'm having conceptual issues using the backgroundkey filter.
>> 
>> Is it intended to take a still image of a static background and remove
>> it from a video stream? If so, I could use help with the filter syntax.
>> If not, I need to be set straight.
>> 
> 
> backgroundkey filter uses single input only video stream and produces
> single output only video stream,
> and uses also scene detection to update alpha mask, this is controlled by
> the filter threshold option.
> 
> Demo:
> 
> ffmpeg -i https://media.xiph.org/video/derf/y4m/bowing_cif.y4m -vf
> "backgroundkey=threshold=0.2:similarity:0.02[v];color=s=cif:c=lime[c];[c][v]overlay=format=yuv422,format=yuv422p"
> out.y4m
> 
> 
> The more trivial, rudimentary technique, taking single still image of
> supposed background and produce alpha mask with combination of input video,
> is also possible, but not with backgroundkey filter, instead using several
> different video filters in non-trivial combination...
> 
> 
> 
>> 
>> Thanks!
>> 
>> Erik
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