GPAC is a Free Software multimedia framework. The project covers different aspects of multimedia, with a focus on multimedia packaging and presentation technologies (graphics, animation, interactivity, VR). We provide popular packagers, streamers and players on http://www.gpac.io.
The GPAC team builds tomorrow multimedia standards. The GPAC team is renowned for its participation in standards (ISO/MPEG, W3C, etc.). GPAC is the reference software for some core multimedia technologies and drives innovative technologies (scalable and interactive video, etc.).
The internship aims at exploring the CMAF standard. CMAF aims at unifying all the existing video streaming formats and is backed by Apple and Microsoft. The role of the intern is to participate in the development of a CMAF validation service.
Continue reading Internship: next-generation video streaming analyzer (Paris, France)
As described here, GPAC supports HEVC tile-based adaptation in DASH. This post gives a quick walkthrough on how to build such sequences.
Continue reading HEVC Tile-based adaptation guide
As some of you may already know, Apple has announced during WWDC2016 the support for fragmented MP4 files in HLS:
We have been adding support in GPAC for fmp4 HLS, both at the client side and at MP4Box side.
Continue reading Support for Apple latest adaptive streaming format
We were at MMSys 2016 talking about new nice features in GPAC: support for MPEG-DASH Spatial Relation Description and HEVC motion-constrained tiling!
We had a quick poster presenting our two demos
Continue reading MPEG-DASH SRD and HEVC tiling for VR videos
Like every year the GPAC team went to the FOSDEM conference. FOSDEM is the biggest worldwide event about Open-Source Software (OSS). It occurs every year in January in Brussels, Belgium.
Continue reading MP4Box.js : our FOSDEM 2016 talk
GPAC GSoC page: https://summerofcode.withgoogle.com/organizations/6481702784335872/
The timeline to see the subject and apply is quite short (25 March for student application deadline): https://developers.google.com/open-source/gsoc/timeline
Please pass along the message. GSoC is a good opportunity for projects to improve and find contributors!
If you have any question, please contact firstname.lastname@example.org.
Release of GPAC 0.6.0.
Release notes are available at: https://github.com/gpac/gpac/releases/tag/v0.6.0
Bug tracker at: https://github.com/gpac/gpac/issues
Enjoy and spread the news!
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!
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.
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.
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).
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.
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
MP4Box -grab-ts udp://ip_adress:port dump.ts
MP4Box -grab-ts udp://22.214.171.124:8000 dump.ts
Dump from a specific network interface
MP4Box (and also other GPAC tools such as the MP4Client player) provides a ‘-ifce’ option:
MP4Box -grab-ts udp://ip_adress:port -ifce ip_address dump.ts
Use ‘ifconfig’ (Unix) or ‘ipconfig’ (Windows) to retrieve your IP address on the interface of your choice. Example:
MP4Box -grab-ts udp://126.96.36.199:8000 -ifce 192.168.1.1 dump.ts
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.