Hi all,

On Thu, Jun 28, 2018 at 01:54:18PM -0700, Brion Vibber wrote:
> Current state on this:
>
> * still hoping to deploy the libvpx+ffmpeg backport first so we start with
> best performance; Moritz made a start on libvpx but we still have to
> resolve ffmpeg (possibly by patching 3.2 instead of updating all the way to
> 3.4)

I've completed this today. We now have a separate repository component
for stretch-wikimedia (named component/vp9) which includes ffmpeg 3.2.10
(thus allowing us to follow the ffmpeg security updates released in Debian
with a local rebuild) with backported row-mt support and linked against
libvpx 1.7.0.

I tested re-encoding
https://commons.wikimedia.org/wiki/File:Wall_of_Death_-_Pitts_Todeswand_2017_-_Jagath_Perera.webm
(which is a nice fast-paced test file) from VP8 to VP9, which results in
a size reduction from 48M to 31M.

When using eight CPU cores on one of our video scaler servers, enabling row-mt
gives a significant performance boost; encoding time went down from 5:31 mins
to 3:36 mins.

All the details can be found at
https://phabricator.wikimedia.org/T190333#4324995

Cheers,
        Moritz

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