[FFmpeg-devel] [PATCH] avfilter: add loudnorm

[Tobias Rapp]

On 06.04.2016 17:02, Clément Bœsch wrote:
> On Wed, Apr 06, 2016 at 09:52:51AM -0500, Kyle Swanson wrote:
>> On Wed, Apr 6, 2016 at 12:45 AM, Clément Bœsch <u at pkh.me> wrote:
>>> Mmh. That's nice and all but... why not use/adjust the native ebur128
>>> filter we have instead of relying on an external library?
>>>
>>> [...]
>>>
>>> --
>>> Clément B.
>>
>> This could be an option for the future. We'll need to break all the
>> EBU R128 logic out into utility functions
>
> why? what do you need exactly from the filter? The meta are exported in
> each audio frame.
>
>> and update it to use the newest version BS.1770 so it can be used by
>> both filters. Using libebur128 is a
>> good option because it is widely used, actively developed, and updated
>> whenever the spec changes.
>
> except it's an external dependency and we have code builtin available,
> doing the same thing, and with no open issue (afaik).

 From the top of my head libebur128 additionally supports sample-rates 
!= 48kHz and allows true-peak measurement (oversampling with the help of 
libspeex-dsp). Don't know if these features are relevant for loudnorm, 
though.

Regards,
Tobias