[Libav-user] AVFilter modify parameters

[Ronak]

Thanks Paul. I was able to modify the af_biquads.c file to process commands and modify the equalization at runtime.

I would like to send you the changes so they can be included inside of ffmpeg. Would you be open to that?


> On Dec 2, 2017, at 4:24 AM, Paul B Mahol <onemda at gmail.com> wrote:
> 
> 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.
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