[Libav-user] Libavfilter - Dynamic filtergraph reconfiguration

[ilkercan Kaya]

>
> A simpler solution, if you only need to implement enabling and disabling
> some of the filters, you can expect the "timeline" support does the
> trick:


I looked at timeline support, correct me if I am wrong but it is done
through the *enable_str  *property of *AVFilterContext*. It is activated
with *avfilter_init_str *call. This seems like setting the *enable_str  *
evaluation can only be done once without reiniting the whole graph. If this
is the case, is there a way to  pass a custom variable to the expression so
that I can switch it on or off? The case in the example at the
documentation, smartblur is hardcoded to be activated between 10 seconds to
3 minutes, in my case I can not foresee when the filter will be turned
on/off.

On Mon, Feb 1, 2021 at 11:10 PM Paul B Mahol <onemda at gmail.com> wrote:

> lowpass, highpass and agate on master git version have both timeline and
> command support.
>
> On Mon, Feb 1, 2021 at 7:39 PM ilkercan Kaya <canilkerkaya at gmail.com>
> wrote:
>
>> Hi Everyone,
>>
>> I am making a mobile music app where the user can add multiple different
>> FXS at runtime to current playing music through a two dimensional pad with
>> an effects header. I am using FFmpeg, libavfilter in C++ to add multiple FX
>> to the audio.
>>
>> My problem is, the user can disable any of the FX's I am using at any
>> time as they wish, the effects I use are agate, lowpass, highpass. The
>> graph is:
>>
>> abuffer -> lowpass -> highpass -> agate -> aformat -> abuffersink.
>>
>> From time to time, I want to disable some of the following  lowpass,
>> highpass, agate. So I thought I could just reconfigure the graph and
>> basically get rid of links to fulfil my wish. I am not sure this is the
>> right way to do it tho. I tried to dig online but all I could find was a
>> thread from 2012 with no conclusion. Libavfilter documentation doesn't say
>> anything about reconfigure or reset existing filtergraph (of that I could
>> find).
>>
>> What would be the best way to do this?
>>
>> Thank you!
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