Re: [FFmpeg-devel] [PATCH] FFMPEG: add graph reconfig capability

[yangyalei via ffmpeg-devel]

Sorry for garbled, reissued as follows.


In the avfiltergraph of FFmpeg, it is required that all filters within the 
graph can obtain a format and successfully negotiate for data flow.


So, is it allowed for the graph to contain filters that cannot obtain a format? 
Can these filters be ignored during format negotiation, allowing only the 
filters that can obtain a format to negotiate successfully?


This patch addresses the problem described in this scenario.


For example:


(abuff_src@Music)(abuff_src@Ring)---amix---abuff_sink


In the graph above, We support three playback scenarios at the same time:


1. Only abuff_src@Music needs to be played, and abuff_src@Ring has no data. 
abuff_src@Ring is ignored during negotiation, "abuff_src@Music -- amix -- 
abuff_sink" link negotiation is successful, and playback can be performed;


2. Only abuff_src@Ring needs to be played, and abuff_src@Music has no data. 
abuff_src@Music is ignored during negotiation, "abuff_src@ring --> amix 
--> abuff_sink" link negotiation is successful, and playback can be 
performed;


3. Both abuff_src@Music and abuff_src@Ring need to be played, and all filters 
are negotiated successfully and mixed playback is performed.






??????
269032...@qq.com



 




------------------ Original ------------------
From:                                                                           
                                             "ffmpeg-devel"                     
                                                               
<geo...@nsup.org&gt;;
Date:&nbsp;Tue, Mar 25, 2025 07:28 PM
To:&nbsp;"FFmpeg development discussions and 
patches"<ffmpeg-devel@ffmpeg.org&gt;;
Cc:&nbsp;"yangyalei"<269032...@qq.com&gt;;
Subject:&nbsp;Re: [FFmpeg-devel] [PATCH] FFMPEG: add graph reconfig capability



yangyalei050 via ffmpeg-devel (HE12025-03-25):
&gt; From: yangyalei <269032...@qq.com&gt;
&gt; 
&gt; 1. Support reuse the graph to play different audio.
&gt; 2. Support config part of the graph.

Please explain what it means. I see a lot of new code, but I have no
idea what triggers it.

Regards,

-- 
&nbsp; Nicolas George
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