[FFmpeg-devel] Re: [PATCH] avfilter: enhance command processing with chain propagation and direction control. (PR #20731)

[Nicolas George via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

Zhao Zhili via ffmpeg-devel (HE12025-10-31):
> Current implementation isn’t a new API, but new flags. It extends the ways to
> traverse a graph. 

A new flag is a new API.

> The existing API has the capability to send commands to a specific filter, a certain
> type of filter, or all filters, but it lacks the ability to send commands to a subgraph,
> unless the user manually filters out all filters belonging to the subgraph, which is
> possible but complex.
> 
> The newly added flags provide subgraph traversal capability.
> 
> A common use case is when a graph contains multiple sources; I want to send
> commands, such as volume control, to a subgraph with a specific source as the
> root node, without affecting other sources. While controlling via volume instance
> names is also feasible, using the source for control offers additional flexibility.

Then we need a patch series that really allows to do that, including
examples.

Regards,

-- 
  Nicolas George
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