[FFmpeg-devel] [PATCH] avfilter: Added siti filter

[Werner Robitza]

On Mon, Feb 1, 2021 at 4:57 PM Nicolas George <george at nsup.org> wrote:
>
> Werner Robitza (12021-01-22):
> > Thanks, I know this, but this is not a known format that can be easily
> > parsed like a plain CSV file.
>
> What you need to do is to extend the metadata filter so that it lets
> output to a file and choose the format.

I suppose that would be the best option, yes. However, metadata comes
in all kinds of shapes, so it's not easy to map arbitrary metadata
(that any filter can generate) to a meaningful output format, in
particular when the result should be CSV.

In particular, such output should be tidy [1]. For instance, you don't
want to output "frame, key, value" with lines "1, si, 53.999", but
rather "frame, si, ti". Such transformations to useful/parsable output
must be done in the filter itself, not vf_metadata …

[1]: https://cran.r-project.org/web/packages/tidyr/vignettes/tidy-data.html