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...@pkh.me> wrote: > > On Tue, Apr 05, 2016 at 07:01:14PM -0500, Kyle Swanson wrote: > >> Here's another audio filter. I hinted at this a few months ago, but I > >> found out that > >> finishing the last 5% took almost as long as the first 95%. This is an EBU > >> R128 > >> dynamic loudness normalization filter. This filter uses libebur128 > >> v1.1.0[1] and must be > >> configured with `--enable-libebur128'. Please also see the accompanying > >> blog post[2] > >> which has an algorithm description, as well as some usage instructions. > >> > >> [1] https://github.com/jiixyj/libebur128 > >> [2] http://k.ylo.ph/2016/04/04/loudnorm.html > >> > >> Thanks! > >> Kyle > >> > >> Signed-off-by: Kyle Swanson <k...@ylo.ph> > >> --- > >> Changelog | 1 + > >> MAINTAINERS | 1 + > >> configure | 5 + > >> doc/filters.texi | 42 +++ > >> libavfilter/Makefile | 1 + > >> libavfilter/af_loudnorm.c | 905 > >> ++++++++++++++++++++++++++++++++++++++++++++++ > >> libavfilter/allfilters.c | 1 + > >> libavfilter/version.h | 4 +- > >> 8 files changed, 958 insertions(+), 2 deletions(-) > >> create mode 100644 libavfilter/af_loudnorm.c > >> > > > > 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). -- Clément B.
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