Category Archives: General

Open positions in our lab

The GPAC team at Telecom ParisTech has two new open positions:

We also have an open PhD position on peer-to-peer streaming in web browsers, description available here.

If you would like to join us in our offices in Paris and participate in our open-source and R&D activities, don’t hesitate to contact us!

 

GPAC scalable and hybrid demo, including French Tennis Open 2015

Dear readers,

For the last few years, the GPAC tools backed demos at the French Tennis Open (Roland Garros) in its demo corner called RG Labs. This year, through the H2B2VS project, we participated in a demonstration showing the use of Hybrid Broadcast Broadband delivery for Ultra HD video content.

The video was encoded using the SHVC format with two layers. The encoder was MPEG reference software. The base HEVC layer, corresponding to HD content, was delivered using MPEG-2 TS, produced by our MP42TS tool. The enhancement layer, enhancing the spatial resolution to UHD, was delivered using MPEG-DASH generated by MP4Box. Both streams were synchronized based on the recent MPEG-2 TS TEMI extensions (inserted by MP42TS in the mux) and played by MP4Client, rendered on this nice curved 4K TV. You can find the press release by France TV here.

RG_TV_small

The GPAC player is very powerful. It features a graphical statistics module able to display and control the player. Look at the screenshot below. It can also be used to choose your HLS or MPEG-DASH quality or limit the download bandwidth to simulate a saturated server environment.

statistics

During the first week of June we were also present at the MediaSync 2015 workshop for talk and demos, as well as invited in the demo session of TVX 2015. We presented some demonstrations developed during the H2B2VS project:

  • HD/UHD hybrid delivery, same demo as the one in RG labs, bug using Tears of Steel (left on the picture).
  • Sign language picture-in-picture service enhancement, with main content on broadcast and sign language video on broadband using MPEG-DASH (right on the picture).
  • Dynamic switch between broadcast and broadband versions of the same content, to allow trick modes in a broadcast (time shifting, rewind, fast forward).

TVX_small

The demonstrations were all using MP42TS for broadcast génération, MP4Box for live or onDemand DASH packaging and MP4Client for the playback. Complete instructions for reproducing the test bed are available here.

Use MP4Box to dump and analyze broadcast TS streams

Today I want to share with you a few tips regarding MP4Box. MP4Box can manipulate MP4 files, but it has also capabilities regarding broadcast streams.

Dump a broadcast TS in a file

Command syntax:

For example:

Dump from a specific network interface

MP4Box (and also other GPAC tools such as the MP4Client player) provides a ‘-ifce’ option:

Use ‘ifconfig’ (Unix) or ‘ipconfig’ (Windows) to retrieve your IP address on the interface of your choice. Example:

Troubleshoot Windows: MP4Box (or any tool) cannot dump my multicast

1) Clicking the Start button and then click on Control Panel. In the search box, type firewall, and then click Windows Firewall.

2) On the left panel, click on “Allow a program or feature through the Windows Firewall”.

3) Make sure all columns are checked for your MP4Box programs.

Enjoy 🙂

Leaving SVN and SourceForge, using Git and GitHub

Dear followers,

In a previous post we mentionned that we had created an official account on GitHub but at that time the migration was not complete. We still used internally the SVN repository hosted on SourceForge and in particular for our BuildBot to generate the Nightly Builds. The git repository was synced with the SVN repository.

Since last week, we have migrated all our tools to use the git repository hosted on GitHub as the official source code of GPAC. The SVN repository at SourceForge will not be maintained anymore. In fact, recent commits have already been made to GitHub which are not present on the SVN.

As part of that migration, we have changed the numbering of GPAC’s binaries. New builds now use a numbering in the form of 0.5.2-DEV-<number-of-commits-since-last-release>-<latest-git-commit-hash>-<git-branch>.

Note also that GPAC is now also automatically built on TravisCI when a commit is pushed to the repository or when a pull request is made. We hope this move to git and GitHub will help improving the code. So don’t hesitate to fork, fix and make pull requests.

The GPAC team.

2015: meet us at FOMS and FOSDEM

Dear followers,

We wish you a happy new year from the whole GPAC team!

GPAC people are attending FOSDEM this year. FOSDEM is a conference which allows “open source communities a place to meet, share ideas and collaborate”. It takes place every year in Brussels, Belgium. It happens that FOMS also occurs at the same time and city. So both organizing teams agreed to make a joint track called “Open Media”.

Cyril Concolato and Romain Bouqueau will give a talk there about the latest multimedia technologies and GPAC. More information at:

If you’re interested and have questions, meet us or ask questions on our forums.

GPAC is now on GitHub

Dear readers,

GPAC is now officially available on GitHub, where you can find:

Please contribute on GitHub as soon as… now!

Of course this is only the beginning. We’d be happy to have your opinion on these changes. The more GitHub requests, feedback and pull-requests we have, the more likely we’ll migrate completely to GitHub 🙂

Open positions from the GPAC team

Like open-source? Want to work in a cool and flexible environment? Want to join a team of world renowned experts? The GPAC project is looking for talented people!

GPAC is a Free Software multimedia framework. We provide packagers, streamers and interactive players at www.gpac.io. We help building tomorrows standards at MPEG, W3C and others.

 

Open positions for engineers, interns, PhDs/postdocs

More information on this page and that page 🙂

Please contact us at jobs@gpac.io if you ave any questions.

 

Skills required 

  • Passionate about computer engineering
  • Programming in C/C++ or Web technologies
  • Multimedia knowledge (codecs, containers, delivery) is a big plus
  • Fluent in English (fluent in French is a plus but not mandatory)

 

If you are interested, you will find more information on the page dedicated and send an email to jobs@gpac.io

EBU-TTD support in GPAC

Following Cyril Concolato’s first attempt to store TTML in ISOBMF, I have added support for parsing and DASHing EBU-TTD as of version 5366 of GPAC. Therefore you don’t need NHML anymore when importing EBU-TTD TTML content. Please read Cyril’s blog post if you wish to know more about TTML or MPEG-4 part 30 (TTML and WebVTT in ISOBMF).

EBU released two specifications recently:

  • TECH 3380 v1.0: EBU-TT-D SUBTITLING DISTRIBUTION FORMAT.
    This document aims to define a distribution subtitling format base on TTML. This is both a restriction (i.e. a profile) and an extension of TTML. The extensions are very limited. The restrictions allow to mitigate most of the TTML criticisms (especially an ability to express things in several ways, which led to a difficult generic parsing process).
  • TECH 3381 v0.9: CARRIAGE OF EBU-TT-D IN ISOBMFF.
    This document explains how to store some EBU-TTD content in ISOBMF. Basically it follows the MPEG-4 part 30 standard.

Useful command-lines for import:

EBU-TTD is recognized automatically:

To extract the TTML samples from the MP4 (generates one TTML per MP4 sample) (note: replace track 1 from this example with your track id) :

Just a few remarks about this implementation:

  • It is made on top of TTML existing support. So it has the same limitations (no images support, etc.).
  • DASH segmentation is fully supported.
  • Regression tests are still unsufficient. We are looking for additional feedback and test files.
  • There are still a few open questions which are on their way to standardization. You can expect a few minor improvements in the future.

 

EBU-TTD current limitations

/!\ These limitations don’t exist if you use NHML /!\

  • Overlapping times are not supported.
  • Multiple <region> elements may trigger errors.

/!\ Fixed limitations /\

  • The expected default namespace of the EBU-TT-D document is ‘http://www.w3.org/ns/ttml’. Documents where this namespace is bound to prefix are supported starting at 08/30/2015 (but no other namespace checks are performed).

 

This development has been made possible thanks to EBU through GPAC Licensing.

UHD HEVC Data Set

As part of the 4Ever project, we have been releasing an HEVC and DASH ultra high definition dataset, ranging from 8bit 720p 30Hz up to 10bit 2160p 60 Hz. The dataset is released under CC BY-NC-ND.
The data set web page is here, and more information on the dataset can also be found in this article.