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Install FFmpeg on RHEL 5 or CentOS 5

Ryan — Wed, 18 Jan 2012 22:45:50 +0000

FFmpeg contains a number of tools to record, convert, stream and play multimedia content. The following tutorial will guide you through the installation of FFmpeg on either RHEL 5 or CentOS 5. I have chosen running on CentOS but it shouldn’t make a difference either way. Lets get started!

Adding the DAG repository

The first thing that you need to do is set up the DAG repository. This repository contains a large amount of very handy packages not available in the default repositories.

Add the following lines to: /etc/yum.repos.d/CentOS-Base.repo
[dag] name=DAG RPM Repository baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag gpgcheck=1 enabled=1

Now you need to add DAG’s GPG key. Without this you will get the following error message when attempting to use it with yum.

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 6b8d79e6 Public key for faac.x86_64.1.26-1.el5.rf.rpm is not installed

Import the GPG key:
rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

This next step is not necessary, but if you encounter any problems you may want to try updating your system.
$ sudo yum update

Install FFmpeg

$ sudo yum install ffmpeg

That should be it.

YouTube Begins Transcoding All Video to WEBM

Ryan — Wed, 20 Apr 2011 15:28:16 +0000

According to the YouTube official blog post. All new videos uploaded to YouTube are now transcoded into WebM. To put that in perspective, nearly 6 years of video is uploaded to YouTube every day. So far they have already transcoded videos that make up 99% of views on their site or nearly 30% of all videos into WebM.

From the offical blog post:
To that end, all new videos uploaded to YouTube are now transcoded into WebM. WebM is an open media file format for video and audio on the web. Its openness allows anyone to improve the format and its integrations, resulting in a better experience for you in the long-term. As we work to transcode more videos into WebM, we hope to reduce the technical incompatibilities that prevent you from accessing video while improving the overall online video landscape.

YouTube will continue to support the H.264 codec and Adobe Flash player, but they are committed to developing their own HTML5 video player.

Installing Ubuntu 9.10 on the Dell Zino HD

Ryan — Wed, 30 Dec 2009 15:46:24 +0000

The Dell Inspiron Zino HD is the perfect machine if you are looking to build an Ubuntu Linux based HTPC. At the time of this post the Zino can be purchased with either Windows 7 or Ubuntu linux 9.04. I decided to go with Windows 7 and install Ubuntu 9.10 64-bit karmic on my own in a dual boot configuration. This article will cover all the steps necessary to get Ubuntu up and running.

The easiest way to setup a dual boot configuration is to reinstall Windows 7 first with the included OS DVD and then Ubuntu second. When installing Windows 7 make sure to leave space for your Ubuntu installation. Repartition the drive so that Windows 7 only uses a small chuck and leave the rest of the space unallocated. The good thing about reinstalling Windows is that it gets rid of all the extra 3rd party junk that comes preinstalled.

You can install Ubuntu through the HDMI but on some TVs the HDMI port may display incorrectly until the ATI drivers are correctly installed. If this occurs to you switch over the the VGA port until you have completed the installation.

The only other pitfall of this installation is that the default Ubuntu installation doesn’t recognize the wireless card (in my build it was the Broadcom wireless b/g card). All this means is that you need to have the wired ethernet connection until you update the system and download the appropriate wireless driver.

Once you have completed the initial installation and made sure you have a working network connection you should update your system.

$ sudo apt-get update && sudo apt-get -y upgrade

Next you need to find and install your hardware drivers. Go here:
System -> Administration -> Hardware Drivers

It should find the Broadcom STA wireless driver for your wireless, and the FGLRX ATI/AMD driver for your video card. Download and activate both of them. You should now be able to connect with wireless and use the HDMI port if you experienced display issues with it during the installation.

If your display resolution if incorrect. Go here:
System -> Administration -> Display

Configure your sound to work over HDMI. Go here:
System -> Administration -> Sound

In the Output tab select HDMI. You can go to the Sound Effects tab and select a sound to test that it works.

You should now a fully functional system up and running with Ubuntu, but you may want to install some packages that will make your make your life easier. Here are my suggestions:

ubuntu-restricted-formats
ssh
nfs-common
sshfs
vim

mythtv
boxee
xbmc

Enjoy your new Zino HTPC!

Fix blue tinted video in Ubuntu

Ryan — Thu, 12 Mar 2009 19:20:05 +0000

A strange issue has been identified in Ubuntu where video takes on a blue colored tint. Other descriptions of the problem include inverted colors, blue skin tones, or distorted video hues. The problems have been reproduced with Totem (Gstreamer), Totem (Xine), Mplayer, as well as VLC and other players.

The common theme with this bug seems to be the use of the Nvidia closed source drivers.

Update 3/11/2011: The problem has been isolated to the interaction between the proprietary NVIDIA driver and the X video extension. The fix should now restore correct video color to all players.

Here is an example showing the blue tint problem.

There are 3 fixes you can try. I have listed them from best to worst.

Fix 1: Install the recomended NVIDIA drivers

Change to the recommended drivers.

System -> Administration -> Additional Drivers

You should have 2 proprietary drivers available. Choose the recommended driver which should be your second option. Restart your system and you should be good to go!

Fix 2: Create a custom setting in gstreamer-properties

Make a change to gstreamer-properties.

Open gstreamer-properties from within a terminal.

$ gstreamer-properties

Now click on the Video tab. From the Plugin dropdown box select Custom. Finally add the following line to the Pipeline box.

videobalance hue=-1 ! autovideosink

The window should look like this.

Fix 3: Turn off Xv optimizations

This is basically your last resort. This will fix your issues for all video players but will result in higher CPU utilization.

Make a change to gstreamer-properties.

Open gstreamer-properties from within a terminal.

$ gstreamer-properties

Now click on the Video tab. From the Plugin dropdown box select X Window System (No Xv).

Enable HDMI output on Dell XPS M1530/M1330 with Ubuntu

Ryan — Sat, 24 Jan 2009 14:45:15 +0000

Hardware support in Linux, specifically Ubuntu 8.10 (Intrepid Ibex) for the Dell XPS M1530 and M1330 is very impressive. However in certain cases the process is not as straight forward as it could be, and it takes a bit of tinkering in order to get it to work. In this article I will go through how to enable audio and video through the HDMI output.

The first step is making sure that the HDMI cable is connected between the computer and external monitor, HDTV, etc.

Video Support

To enable the video you need to go to your NVIDIA X Server Settings manager. This of course assumes you are using the NVIDIA driver on your system.

System -> Administration -> NVIDIA X Server Settings

Select the X Server Display Configuration. Click the Detect Displays button and you external monitor should be displayed. Click on the external screen so that it becomes selected and click the Configure button and select the TwinView option.

Once this monitor is enabled a Position dropdown box should appear. It is best in most cases to select Clones.The screen output will be duplicated on both devices.

Select the Apply button for these changes to take effect.

If your external monitor has a lower resolution than your laptop screen it may help to disable the laptop screen so that maximized video won’t go beyond the borders of your external monitor. To do this click the laptop screen so that it becomes selected, click the Configure button, and select Disabled.

Audio Support

Open the Volume Control manager, usually ou can click on the volume applet on the top GNOME panel.

Make sure your device is set to HDA Intel (Alsa Mixer).

Select the Switches tab and put a check mark next to IEC958. Selecting this enables audio output over the HDMI connection.

If you want to disable audio output through your laptop speakers you can disable them. Go back to the Playback tab and mute the Front channel.

Bugs

1) Enabling the laptop screen as well an external monitor through HDMI can cause X to freeze with certain Compiz-Fusion effects such as desktop switching. Disabling Compiz-Fusion or disabling the laptop screen while operating in this mode fixes this issue.

2) Disabling the laptop monitor will not correctly resize the GNOME desktop to match the resolution of the external monitor over HDMI. However video playback will still be correctly maximized.

3) Audio output over HDMI connection may not work for a specific program even if everything has been configured correctly. Restarting this program usually fixes this issue.