[FFmpeg-devel] ffmpeg Filtergraph Output

[Dennis Mungai]

On Sun, 24 May 2020 at 05:44, Soft Works <softworkz at hotmail.com> wrote:

> Hello,
>
> I've seen the commit about the option for dumping the filtergraph and that
> reminded me about something that I'd be willing to contribute in case
> anybody likes it.
>
> A while ago I was looking for a way to get information about the
> filtergraphs that ffmpeg builds at runtime, the individual formats that
> have been negotiated between input and output pins and which filters have a
> hardware context.
>
> I had expected that this is what the graph2dot is intended to do, but that
> wasn't the case. Turning a filter string into a graph is not what I was
> looking for.
>
> Eventually I have implemented a feature that iterates all filters, their
> connections and the negotiated media formats during runtime and writes them
> out as json or xml (using the same methods that ffprobe uses).
>
> I have attached an example output and an image as an example for what
> could be done with the output.
>
> Let me know whether there's some interest in this.
>
> Regards
> Softworkz
>
> Direct links to the attachments:
> https://gist.github.com/softworkz/4f4bf2c1365d2ce3f6ac70b1b434aa40
> https://github.com/softworkz/ffmpegfiltergraphs/issues/1
>
>
>
This is very fascinating, thanks for working on this.
Such output would allow for troubleshooting filter performance, especially
in complex filter setups where hardware contexts are in use.