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

[Zhao Zhili via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

Hi Nicolas,

> On Oct 31, 2025, at 17:58, Nicolas George via ffmpeg-devel <ffmpeg-devel@ffmpeg.org> wrote:
> 
> 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.


Use cases and FATE tests have been added with libavfilter/f_sendcmd.c, it looks fine
to me, could you please take a look?

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20731


> 
> Regards,
> 
> -- 
>  Nicolas George
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