[FFmpeg-user] Questions about using CROP filter to pan a jpeg image

[Bram van Oosterhout]

Thanks for the prompt response :-)
A follow up on Q2.

On Fri, Sep 27, 2024 at 9:51 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Am 27.09.2024 um 13:37 schrieb Bram van Oosterhout:
> > The expression for x (third parameter in crop: 960*t ) contains
> > a variable t.
> > [Q2] What is t. I am unable to find it in the documentation.
>
> It's described in the documentation:
> https://www.ffmpeg.org/ffmpeg-all.html#crop
> t is the timestamp expressed in seconds.
>

Thanks for the reference and... my IMG_8048.JPG has only one timestamp:
2024:04:11 18:46:26.
/tmp/On6Ub.JPGdoes not have a timestamp:
file  /tmp/On6Ub.JPG
/tmp/On6Ub.JPG: JPEG image data, baseline, precision 8, 4423x1080,
components 3
[Q2.1] So why does t vary?
[Q2.2] And with what start and interval?

>
> > [Q3] Is t related to the framerate?
>
> no.
>
> > [Q4] There are other magic numbers(?) in various web posts (like: n).
> > Where are they documented?
>
> at the same place as above.
>
> Michael
>
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