Great roundup post Brion. Let's keep the momentum going!
We'll be sending more stuff in the next few days, but here's a link to the
first of three talks at Wikimania:
Two more to come -- a content talk and a discussion roundtable.
Associate professor of journalism, American University
On Sun, Jul 19, 2015 at 5:45 PM, Brion Vibber <bvibber(a)wikimedia.org> wrote:
There were a fair number of folks interested in video
Wikimania! A few quick updates:
* An experimental 'Schnittserver' ('Clip server') project has been in
works for a while with some funding from ze Germans; currently sitting at
(uses OAuth, has a temporary SSL cert, UI
is very primitive!) It is currently usable already for converting MP4 etc
source footage to WebM!
The Schnittserver can also do server-side rendering of projects using the
'melt' format such as those created with Kdenlive <https://kdenlive.org/>
and Shotcut <http://www.shotcut.org/> -- this allows uploading your
original footage (usually in some sort of MP4/H.264 flavor) and sharing the
editing project via WebM proxy clips, without generational loss on the
Once rendered, your final WebM output can be published up to Commons.
I would love to see some more support for this project, including adding a
better web front-end for managing projects/clips and even editing...
* Mozilla has an in-browser media editor thing called Popcorn.js
<http://popcornjs.org/>; they're unfortunately reducing investment in the
project, but there's some talk amon people working on it and on our end
that Wikimedia might be interested in helping adapt it to work with the
Schnittserver or some future replacement for it.
Unfortunately I missed the session with the person working on Popcorn.js,
will have to catch up later on it!
* I'm very close to what I consider a 1.0 release of ogv.js
experimentally WebM) video and audio in Safari and MS IE/Edge without
Recently fixed some major sound sync bugs on slower devices, and am
finishing up controls which will be used in the mobile view (when not using
the full TimedMediaHandler / MwEmbedPlayer interface which we still have on
Demo of playback at https://brionv.com/misc/ogv.js/demo2/
A slightly older version of ogv.js is also running on
with integration into
TimedMediaHandler; I'll update those patches with my 1.0 release next week
* Infrastructure issues:
I had a talk with Faidon about video requirements on the low-level
infrastructure layer; there are some things we need to work on before we
really push video:
- seeking/streaming a file with Range subsets causes requests to bypass
the Varnish cache layer, potentially causing huge performance problems if
there's a usage spike!
- very large files can't be sharded cleanly over multiple servers, which
makes for further performance bottlenecks on popular files again
- VERY large files (>4G or so) can't be stored at all; which is a problem
for high-quality uploads of things like long Wikimania talks!
For derivative transcodes, we can bypass some of these problems by
chunking the output into multiple files of limited length and rigging up
'gapless playback', as can be done for HLS or MPEG-DASH-style live
streaming. I'm pretty sure I can work out how to do this in the ogv.js
player (for Safari and IE) as well as in the native <video> element
playback for Chrome and Firefox via Media Source Extensions
Assuming it works with the standard DASH profile for WebM, this is
something we can easily make work on Android as well using Google's
DASH playback will also make it easier to use adaptive source switching to
handle limited bandwidth or CPU resources.
However we still need to be able to deal with source files which may be
potentially quite large...
* List and phab projects!
As a reminder there's a wikivideo-l list:
and a Wikimedia-Video project tag in phabricator:
Folks who are interested in pushing further work on video, please feel
free to join up. There's a lot of potential awesomeness!
Wikivideo-l mailing list