Ok, after some delay for re-tweaking the encoding settings for higher quality when needed, and pulling in some other improvements to the config system, all related updates to TimedMediaHandler have been merged. :D
If all goes well with the general deployments in the next few days, expect the beginning of VP9 rollout starting next week.
Changes since the earlier announcement: * the new row-multithreading will be available, which allows higher threading usage at all resolutions; encoding times will be more like 1.5-2x slower instead of 3-4x slower. * switch to constrained quality with a larger max bitrate: many files will become significantly smaller in their VP9 versions, but some will actually increase in exchange for a huge increase in quality -- this is mostly 60fps high-rate files, and those with lots of motion and detail that didn't compress well at the default low data rates.
-- brion
On Fri, Jun 29, 2018 at 9:46 AM Brion Vibber bvibber@wikimedia.org wrote:
Awesome sauce. Thanks Moritz!
-- brion
On Fri, Jun 29, 2018 at 7:39 AM Moritz Muehlenhoff < mmuhlenhoff@wikimedia.org> wrote:
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... (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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