[FFmpeg-devel] [PATCH] [RFC] Add option for writing detailed filtergraph information to file or stdout

[Nicolas George]

Soft Works (12021-08-26):
> This is a more complete and more flexible alternative to the recently submitted
> patch "fftools: add -lavfi_dump option"
> https://patchwork.ffmpeg.org/project/ffmpeg/patch/20210823094504.100789-2-george@nsup.org/
> 
> I'm tagging this patch as 'RFC'. There's no need to tell that this is duplicating
> code from ffprobe. It does, because that's the most efficient way for the code to
> live at my side (unaffected and safe from regressions by upstream changes).
> 
> Should it be considered for merging into main, it will likely make sense to merge
> and or re-use ffprobe output writers.
> 
> The key benefits of this implementation are:
> 
> - Other than graph2dot and other means for printing filter graphs, this is
>   outputting:
>   - all graphs with runtime state
>     (including auto-inserted filters)
>   - each graph with its inputs and outputs
>   - all filters with their in- and output pads
>   - all connections between all input- and output pads
>   - for each connection:
>     - the runtime-negotiated format and media type
>     - the hw context
>     - if video hw context, both: hw pixfmt + sw pixfmt
> - Output can either be printed to stdout or written to specified file
> - Output is machine-readable
> - Can output in all the same formats like ffprobe (default, compact, flat,
>   ini, json, xml)

What is the practical purpose of this feature?

-- 
  Nicolas George
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