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From: Soft Works <softworkz-at-hotmail.com@ffmpeg.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Thread-Topic: [FFmpeg-devel] [RFC] FFmpeg Execution Graph Visualization
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Date: Fri, 21 Mar 2025 20:11:29 +0000
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Subject: Re: [FFmpeg-devel] [RFC] FFmpeg Execution Graph Visualization
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> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Stefano Sabatini
> Sent: Freitag, 21. M=E4rz 2025 19:27
> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [RFC] FFmpeg Execution Graph Visualization
> =
> On date Tuesday 2025-03-18 02:32:13 +0000, Soft Works wrote:
> > Hello everybody,
> >
> > working on the subject of writing out filtergraph information
> > obviously implies the goal of being able to visualize that data in
> > some way. While I do have something for long, it's tailored for
> > specific workflows and is hardly useful for most.
> >
> > Anyway, it shouldn't be required to use once another software for
> > visualize the output. This decimates the usability for any such
> > feature by far. Few days ago, I was thinking about ways for making
> > this feature really useful for everybody without needing to jump
> > through any extra hoops. We have that range of writers (now "text
> > formatters"), and so I wondered whether there isn't some text format
> > that is meant to directly represent a graph for visualization
> [...]
> > Examples
> >
> > I've created a Gist with some examples of the output here:
> >
> > https://gist.github.com/softworkz/a196b2d0e9e2df49f766abd92f508551
> >
> > (also includes a zip with html file examples)
> > Questions
> >
> > I'm curious what you think about it!
> >
> > - What's good, what's bad, what should be changed/improved?
> >
> > - What about the displayed information, should something be added?
> >
> > - I'm folding out the buffer source/sink filters to simplify the view,
> is that ok?
> > Should the TRIM filters be excluded as well?
> >
> > - Since it's no longer just about filter graphs - what do you think
> about the term
> > "Ffmpeg Execution Graph"?
> > (other ideas welcome)
> >
> > - Does anybody have some complex command lines for me to test?
> > (no need to include media files, I can try to replicate
> > something similar)
> >
> =
> Thanks for working on this, from the examples it looks pretty amazing.
> =
> What it's not clear to me is how this builds up on top of text
> formatters, since they are meant to render a tree structure in a
> generic way. From this you can have a description of a graph, but then
> you need specialized ad-hoc logic to convert it to a graph format.
> =
> What am I missing?
Hehe, that's been a bit tricky indeed, but more in terms of figuring out th=
at (and how) it can fit into the writer/textformatter patterns, the result =
is rather simple and it requires only some moderate extensions to the write=
r/formatter APIs:
It is using a Mermaid Flowchart graph with only 3 kinds of elements:
- Shapes
i.e. "boxes", can't be nested
- Subgraphs
Container for shapes, can be nested
- Links
connection from one shape to another
A simple graph with 2 shapes in a subgraph looks like this:
...
flowchart TD
subgraph s1["Subgraph 1"]
A("Shape A") --> B("Shape B")
end
...
There's a link from A to B - but: it can also be written in a different way:
...
flowchart TD
subgraph s1["Subgraph 1"]
A("Shape A")
B("Shape B")
end
A --> B
...
This does the same thing. The link definitions can be at a different place =
in the document - which is one of the key points to make it work.
Then there are three new section flags to denote subgraph, shapes and links=
and two fields in the section struct (source_id_key, dest_id_key). For lin=
k-producing sections they indicate the names of the keys to use for buildin=
g a link. A section can also produce both - shapes and links when the flags=
are set accordingly.
I also use another (existing) mechanism, which is the data object that can =
be provided on section start, only that it's a (publicly) defined "SectionC=
ontext" struct, which is a somewhat alternative direction. I kept it for th=
e moment as suggestion because I didn't know which ideas you have for the A=
PI to evolve, so that's just something for discussion.
Best,
sw
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