Tag / Linux TV

  • Kaffeine version 2.0.4 has been released today, substantially improving its already excellent Digital TV (DTV) support! Update: tarball is now available at: http://download.kde.org/stable/kaffeine/2.0.4/src/kaffeine-2.0.4.tar.xz While version 2.0.4 was meant to solve several bugs reported via the project’s bug tracker, it offers a lot more: DVB-S/S2 Kaffeine improvements Kaffeine now supports the ability to select the Low Noise Blockdown feedhorn (LNBf) among a list of other LNB features used on Digital TV. This list comes from libdvbv5, which provides the backend to setup a satellite configuration. Other Network Information Table Scans Digital TV relies on physical transponders to transmit a signal, and each transponder can carry multiple channels. There’s a special table in the MPEG transport stream that’s responsible for listing the other transponders associated with a given transmission that belong to the same network provider. This table is called the Network Information Table (NIT). Sometimes, there are multiple tables on an […]

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  • June 3, 2016 - Mauro Carvalho Chehab

    Watching Digital TV Via Kaffeine

    Kaffeine is a media player application that uses the KDE libraries. As part of my work maintaining the Linux Kernel media subsystem I needed some tools to test whether or not the digital TV core support works properly and to test Linux drivers for new devices. So, I’ve recently been working to improve Kaffeine to offer the necessary features for such tests. As part of this, I recently created a major Kaffeine version (2.0) that uses the latest version of KF5 (KDE Frameworks 5), and to use Qt5 library. I also started helping with upstream Kaffeine maintenance. UPDATE: Added instructions for Arch Linux How to Install Kaffeine Installing Kaffeine is easy. If you run openSUSE Tumbleweed, you can find an up-to-date package with the latest state of development tree in the KDE:Unstable:Extra repository. So, to use the newest version of Kaffeine, all you need to do is to run:


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  • June 1, 2016 - Mauro Carvalho Chehab

    A Report From the Linux Media Summit in Sunny San Diego

    Linux Media Summit Report 2016 – San Diego The first 2016 Linux Media Summit was recently held on April, 7 in San Diego, California in conjunction with the Embedded Linux Conference. This post will cover some of the major developments that took place during this summit. Linux Media Summit Group Photo CEC Framework Status Update The first version of the Consumer Electronics Control framework is nearing completion, and will likely be submitted for either Kernel 4.7 or 4.8. This framework will allow a lot of useful end-user features including better menu, playback, recording, and tuner control in addition to remote control pass-through. In will also enable better device information discovery and routing. Finally, plans to implement ARC/CDC hotplug support were revealed as well as plans to implement high level protocol constraints (resend, timeout, rate limiting of messages). Whether those constraints can be implemented in the kernel remains to be analyzed, […]

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  • This article contains a summary of the discussions that took place at the Media Controller Workshop in Espoo, Finland from July 29 – 31, 2015. A more detailed breakdown of these discussions can be found on Linux TV. This is the first  workshop dedicated to the Linux Media Controller. It follows a v4l summit that took place back in 2010 in Finland that established the current foundation for the media controller. This was aimed at properly satisfying the needs of reporting pipelines on the smartphone System on a Chip (SoC). The focus of this year’s workshop was to clarify the kernel→userspace interfaces and extend the Media Controller to be used on other subsystems that need to represent graphs like Linux Digital Video Broadcasting (DVB), Advanced Linux Sound Architecture (ALSA), and Industrial I/O (IIO). Samsung had a strong representation at this workshop, including Shuah Khan and Mauro Carvalho Chehab from the […]

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  • Part 1 of this series can be read here. Supporting embedded Digital TV (DTV) hardware is complex, considering that such hardware generally has multiple components that can each be rewired during runtime to dynamically change the stream pipelines and provide flexibility for activities like recording a video stream while tuning into another channel to watch a different program. The first article of this series described how the Digital Video Broadcasting (DVB) pipelines are setup and the needs that should be addressed by the Linux Kernel. In this article, I’ll  discuss the needs of the DVB API with a focus on the network interfaces that are part of any DTV device. An Introduction to Digital TV Network Interfaces Typical DTV devices have dedicated hardware that provides the network interfaces. If you would like to learn more about such hardware, check out the first post in this series, specifically Figure 6 and […]

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  • May 8, 2015 - Mauro Carvalho Chehab

    Media Controller Support for Digital Video Broadcasting

    Supporting embedded Digital TV hardware is complex, considering that such hardware generally has multiple components that can be rewired in runtime to dynamically change the stream pipelines and provide flexibility for things like recording a video stream, then tuning into another channel to see a different program. This article describes how the DVB pipelines are setup and the needs that should be addressed by the Linux Kernel. This introduction will lead into the next article in this series, which will describe how the media subsystem is being improved to support such needs. Digital TV devices A Digital TV device consists of a set of hardware blocks. The basic components are: Tuner – Tunes into a physical frequency (tuner), and outputs the channel on an Intermediate Frequency (IF). Demodulator (a. k. a. demod) – Gets an IF, decodes the sub-carrier(s) content, and outputs the resulting MPEG-TS stream. It is specific for […]

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