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VideoLAN Dev Days conferences
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Welcome to Video Dev Days 2019

The VideoLAN non-profit organization is happy to invite you to the multimedia open-source event of the fall!

For its eleventh edition, people from the VideoLAN and open source multimedia communities will meet in Tokyo to discuss and work on the future of the open-source multimedia community.

This is a very technical conference, focused on low-level multimedia.

Who can come?

Literally every one is invited to VDD, we just need registration for legal reason (to enter the building).

This is a technical conference, focused on low-level multimedia, like codecs and their implementations like x264 or dav1d, frameworks like FFmpeg or Gstreamer or playback libraries like libVLC.

Things like Javascript video frameworks or ad-injection frameworks would be considered out of scope.

The price to enter is totally Free.

Sponsorship for Japan

Since Japan is a bit further than the usual conferences, often in Europe, going to Japan is more expensive.

If you want VideoLAN to sponsor your trip, you should read the Sponsorship Policy.

Traveling to Japan

You should consider staying a bit longer to Japan, if you can afford a few extra days. Kyoto is amazing!

You should take care of your passport and, if applicable, your visa very quickly!

See the dedicated page: traveling advice for Japan.

You might want to consider to offset your carbon footprint.
For example: MyClimate CO2 Calculator or CarboonFootPrint.com


Friday November 8th

Community bonding day !

PokeCone : Codec Wars !

Discover your team members in a discovery game around Tokyo.
Please meet in the sponsored hotel lobby at 9:30am

Hotel Villa Fontaine Hakozaki

Evening drinks

19:?? Evening drinks at ??

Sponsored by Mozilla.

(NB: food is not provided there)

Saturday November 9th


Time Opera 1 Auditorium
08:30 - 09:00 Registration
09:00 - 09:10 Welcome words by Jean-Baptiste Kempf, VideoLAN
09:10 - 09:20 Internet Initative Japan by Marie Gunji, IIJ
09:20 - 09:50 Dav1d by Ronald S. Bultje, Two Orioles
09:50 - 10:20 Sash and low latency adaptive streaming, by Phil Cluff, Mux
10:20 - 10:50 x265 update, by Pradeep Ramachandran, MulticoreWare inc.
10:50 - 11:05 Break
11:05 - 11:35 rav1e update by Thomas Daede, Mozilla
11:35 - 12:05 VLC 4.0 by Jean-Baptiste Kempf, VideoLAN
12:05 - 12:20 Tokyo Video Tech
12:30 - 14:00 Bentō lunch break sponsored by J-Stream
13:30 - 14:00 Group photo (Goodies distribution will start before 13:30)
Time Opera 1 Auditorium Opera 2 Auditorium Cantata Meeting Room
14:00 - 16:00 VLC Technical meeting AV1 meetup Hacking open sessions
16:00 - 18:00 VideoLAN meeting Meetups Hacking open sessions
19:30 - 21:30 Community Dinner sponsored by Mozilla

VideoLAN community dinner

You really need to be on time

  Warayakiya Ginza
  Ginza, 6 Chome−5−15 
  銀座能楽堂ビル 6F
  わらやき屋 銀座店
  銀座能楽堂ビル 6F

Sunday November 10


Time Description
09:30 - 13:00 Lightning talks
  • Intel update from Max
  • llvm-mingw by Martin Storsjo
  • 360 intra directional predictors by Luc Trudeau
  • Vimeo elevator by Raphael Zummer
  • GSoC experiences by Krishnan
  • VLC Benchmark by Duncan


  • A Japanese Way to Maintain Constant Quality by Yusuke Goto
  • Patents by Vittorio
  • TTML in mp4 by JEEB
  • BlitzLoop by marcan
  • color: daala, dav1d and beyond by David Michael Barr
  • Compiler-assisted security by Rémi D.-C.
  • Rust with C by Luca
  • Sub-frame decoding by Kieran
13:00 - 14:00 Bentō lunch break sponsored by Abema TV

Afternoon schedule

Time Opera 1 Auditorium Opera 2 Auditorium Cantata Meeting Room
14:00 - 15:00 Unconferences FFmpeg user meetup Gitlab CI session (VLC, but not-only)
15:00 - 16:00 Unconferences FFmpeg dev meetup VLC mobile ports meetup
16:00 - 18:20 Unconferences FFmpeg dev meetup VLC UI and media library
18:20 - 18:30 Closing remarks by jb
18:30 - 21:30 Unofficial Dinner and Karaoke sessions

Unofficial Dinner

It is literally next to the IIJ office.

  Amusement Bar J-House
  Chiyoda City, Fujimi, 2 Chome−3−14 
  CST ビル 5F
  アミューズメントバー ジェイハウス

Practical information

  • The official JNTO site has a wealth of practical information targeting first-time visitors.
  • The air travel page provides more info for arrival and departure.

Location / main venue

The meeting is happening at the IIJ HQ:

In English In Japanese
Internet Initiative Japan Inc.

Iidabashi Grand Bloom
2-10-2 Fujimi, Chiyoda-ku
Tokyo 102-0071


〒102-0071 東京都千代田区富士見2-10-2

Do not lose the issued access pass, you will need it to re-enter the building during the 2 days.

The venue is within walking distance of Iidabashi station served by:

  • JR East
    • Chuo-Sobu (JB16) train line,
  • Tokyo Metro
    • Tozai (T06),
    • Yurakucho (Y13) and
    • Namboku (N10) lines,
  • Toei
    • Odeo (E06) metro line.

From the sponsored attendees' hotel, take the Tozai line west-bound from Kayabachō station (T11).

Accommodation / Hotel

If you are sponsored by the VideoLAN association, your hotel is:

In English In Japanese
Hotel Villa Fontaine Tokyo Nihombashi Hakozaki

20-10 Hakozaki-cho Nihombashi
Chuo-ku Tokyo, 103-0015


〒103-0015 東京都中央区日本橋箱崎町20−10


Elsewise, please make your own arrangements for accommodation.

Check-in is 3:00pm. Check-out is 11:00am. Breakfast available from 7:00 to 9:30am.

Beware that there are plenty of Villa Fontaine hotels in the area. Be sure to head to the Hakozaki one.

Public transit

Origin Recommended route
Conference venue Tokyo Metro Tozai line east-bound to Kayabachō station (T11).
Sengakuji station
Haneda airport via the Keikyu railway
Toei Asakusa metro line north-bound to Ningyōchō station (A14)
Ueno station
Narita airport via the Keisei electric railway
Tokyo Metro Hibiya line south-bound to Ningyōchō station (H13).
T-CAT terminal
Haneda airport via T-CAT
Narita airport via T-CAT
Short walk.
Tokyo station
Yaesu Keisei bus stop
Narita via Keisei bus
1,7 km walk from the North exit.

In addition to Kayabachō and Ningyōchō, the Suitengu-mae station (Z10) on the Tokyo metro Hanzōmon line is also located close-by.


  • Get a Japanese electronic payment card to travel easily on the public transports.
  • Check the dedicated page for airport transfers.
  • For routing, you can use the following services:
Vendor Website Google Play Apple App Store
Hitachi Hyperdia Hyperdia here here
Japan National Tourism Organization - here here

NOTE: VideoLAN does not refund taxi, car rental and public transport.

Rail pass

If you have a voucher for a rail pass, you should save it for before or after the conferencing days. JR passes are of limited within central Tokyo. They are valid for the Yamanote loop and the Chuo-Sobu east-west transverse train lines, as well as JR-operated buses, but not on the metro networks.

Means of payment

VISA and MasterCard cards are not universally accepted in Japan.


You will need to withdraw cash from an international ATM (accepting VISA, MasterCard, AmEx, Discovery and UnionPay). You can find those:

  • at arrivals in the airport terminal,
  • at 7-Eleven convenience stores,
  • at Family Mart convenience stores,
  • and during office hours in Japanese Post offices.

Do not bother with the local banks ATMs, most of which do not accept overseas cards. To be on the safe side, you could exchange a few tens of thousands of yens in advance. Compare prices and avoid the extortionate bureaux de change at airports!

Electronic payments

For small day-to-day purchases, you should procure a FeliCa electronic payment card, a.k.a. an IC card. It can be used to enter and exit public transports (train, metro, bus, etc), to check out at convenience stores and many shops. You can load the card with Japanese bank notes at dedicated machines. There are two options in Tokyo area:

Vendor Regular card Tourist card Tourist point of sale
JR East Suica
¥500 deposit
Welcome Suica
JR East Travel Service Center
Tokyo Metro Pasmo
¥500 deposit
Pasmo passport
  • Keisei at Narita airport
  • Keikyu at Haneda airport

Tourist cards with their cutesy design are meant to keep as memento and provide third-party discounts. But beware that they expire after 28 days (including any unused credit).


Japan has the lowest household voltage in the world, so check the specifications on your power adapters. Outlets are not compatible with European or Commonwealth plugs. North American grounded plugs (with 3 pins) are also troublesome. Most attendees will thus need passive adapters. They are easier to find at home, so BUY BEFORE DEPARTURE.

Voltage 100 V
Frequency 50 Hz (60 Hz in Kyoto/Osaka)
Socket Type A with only 2 pins (i.e. ungrounded)


The telephone prefix for Japan is +81.

Mobile data

You can buy, or better yet pre-order, a prepaid data SIM card at international arrivals at the airport. Don't postpone, as it might be difficult to find elsewhere.

Wireless LAN

Free Wi-Fi access points are common, but they may need registration, possibly in Japanese only. There is a map of known Wi-Fi access points in the JNTO app (see #Transportation).

Group Chat

Participants can share information and discuss using the dedicated VDD 2019 Telegram group.


119 is the fire and ambulance emergency number in Japan. 110 is the local police number.

Please carry your travel insurance card or certificate on you at all times. If you do not have a travel insurance yet, buy a fixed-term one before you depart. EU social security cards are not not valid in Japan. Advise your relatives, and if applicable, your government:

Personal safety risks in Japan primarily stem from natural disasters:

  • JNTO safety tips
  • In case of earthquake:
    • Seek cover (e.g. under a table) if indoors,
    • Get away from structures (especially glass windows) if outdoors.
    • After the quake, get away from the shore onto high ground away from tidal waves.
  • In case of typhoon, follow instructions from authorities. Typhoon are predicted several days ahead.


The VideoLAN Dev Days are organized by the board members of the VideoLAN non-profit organization:

  • Jean-Baptiste Kempf,
  • Denis Charmet,
  • Konstantin Pavlov, and
  • Hugo Beauzée-Luyssen.

You can reach us here.