[Libav-user] Libavfilter - Changing audio filter parameters during runtime C++

[Paul B Mahol]

On Sat, Jan 30, 2021 at 11:12 PM Paul B Mahol <onemda at gmail.com> wrote:

>
>
> On Sat, Jan 30, 2021 at 11:08 PM Paul B Mahol <onemda at gmail.com> wrote:
>
>>
>>
>> On Sat, Jan 30, 2021 at 11:00 PM ilkercan Kaya <canilkerkaya at gmail.com>
>> wrote:
>>
>>> Hi Everyone,
>>>
>>> I am making a mobile music app where the user can add FX to current
>>> playing music through a two dimensional pad. I am using FFmpeg, libavfilter
>>> in C++ to add FX to the audio. In FFmpeg you can create an audio filter and
>>> set it parameters and initialize a graph.
>>>
>>> My problem is since the user will use a FX pad to change these
>>> parameters with their fingers I need to be able to modify these parameters
>>> during runtime.
>>>
>>> Looking at ffmpeg filter documentation, it says the following:
>>>
>>> "Some options can be changed during the operation of the filter using a
>>> command. These options are marked ’T’ on the output of ffmpeg -h filter=.
>>> The name of the command is the name of the option and the argument is the
>>> new value."
>>>
>>> I looked at aecho, agate, acrusher and more but nearly all the effects I
>>> want have 0 modifiable option which makes my FX pad nonadjustable.
>>>
>>> Is there a way to make ffmpeg audio filters change their parameters
>>> during runtime?
>>>
>>> I could really use the help, thank you!
>>>
>>
>> It is currently not implemented, because nobody needed such feature.
>>
>> Latest git ffmpeg master, have T support for agate and acompressor and
>> couple others.
>>
>
> Also you really want both T and C (and S if performance is important)
> C is for commands
> T is for timeline with enable options.
>
> Also that documentation is wrong, C is flag you need.
>

Ignore that line, C is for output of "ffmpeg -filters"
T is for "ffmpeg -h filter=agate"


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