[Libav-user] AVFilter modify parameters

[Paul B Mahol]

On 12/2/17, Ronak <ronak2121-at-yahoo.com at ffmpeg.org> wrote:
> Are you saying that the treble, bass and equalizer filters will let me
> modify the gain at runtime?

No, i never said that.

>
> What command would I send? I can't find any documentation that tells me what
> command to even send.
>
> avfilter_graph_queue_command(self.filterGraph, band.name.UTF8String,
> "setGain??", "gain=6", NULL, 0)

Look at documentation for anequalizer or firequalizer filter.

>
>
>> On Dec 1, 2017, at 4:54 PM, Paul B Mahol <onemda at gmail.com> wrote:
>>
>> On 12/1/17, Ronak <ronak2121-at-yahoo.com at ffmpeg.org
>> <mailto:ronak2121-at-yahoo.com at ffmpeg.org>> wrote:
>>> Out of curiosity, is there a reason why the Filters could not be mutable,
>>> so
>>> we can set the gain values dynamically?
>>>
>>> Making them immutable makes it that much harder to integrate the
>>> library.
>>
>> As already expained to you, there are filters that supports runtime
>> change of parameters.
>>
>>>
>>>
>>>> On Nov 26, 2017, at 2:37 PM, Paul B Mahol <onemda at gmail.com> wrote:
>>>>
>>>> On 11/26/17, Ronak <ronak2121-at-yahoo.com at ffmpeg.org> wrote:
>>>>> I see. I'm using the treble, bass and equalizer filters. And the user
>>>>> should
>>>>> have the ability to manipulate the gain at run time...
>>>>>
>>>>> So, is the best thing to do to destroy and recreate the AVFilterGraph
>>>>> then?
>>>>
>>>> Yes.
>>>> _______________________________________________
>>>> Libav-user mailing list
>>>> Libav-user at ffmpeg.org
>>>> http://ffmpeg.org/mailman/listinfo/libav-user
>>>
>>> _______________________________________________
>>> Libav-user mailing list
>>> Libav-user at ffmpeg.org <mailto:Libav-user at ffmpeg.org>
>>> http://ffmpeg.org/mailman/listinfo/libav-user
>>> <http://ffmpeg.org/mailman/listinfo/libav-user>
>>>
>> _______________________________________________
>> Libav-user mailing list
>> Libav-user at ffmpeg.org <mailto:Libav-user at ffmpeg.org>
>> http://ffmpeg.org/mailman/listinfo/libav-user
>> <http://ffmpeg.org/mailman/listinfo/libav-user>
>