Archive for the ‘multimedia’ Category

First steps using the Kworld UB499-2T USB TV in Ubuntu Precise

July 26th, 2014 No comments

My aim is to explore the capabilities of this device under Xubuntu 12.04 Precise. This Ubuntu distribution has the following kernel version: 3.2.0-52-generic

The KWorld UB499-2T USB TV receiver

After plugging the USB dongle, the following entry appears when running lspci

Bus 001 Device 002: ID 1b80:e409 Afatech IT9137FN Dual DVB-T [KWorld UB499-2T]

Dmesg shows the following details about what Ubuntu discovered

[ 2576.131053] it913x: Chip Version=01 Chip Type=9135
[ 2576.131053] it913x: Dual mode=3 Remote=5 Tuner Type=38
[ 2576.131053] it913x: Chip Version=01 Chip Type=9135
[ 2576.131053] dvb-usb: found a 'Kworld UB499-2T T09(IT9137)' in cold state, will try to load a firmware
[ 2576.182035] dvb-usb: did not find the firmware file. (dvb-usb-it9137-01.fw) Please see linux/Documentation/dvb/ for more details on firmware-problems. (-2)
[ 2576.182050] it913x: DEV it913x Error
[ 2576.182139] usbcore: registered new interface driver it913x
[ 2576.229039] IR NEC protocol handler initialized
[ 2576.318930] IR RC5(x) protocol handler initialized
[ 2576.386718] IR RC6 protocol handler initialized
[ 2576.418104] IR JVC protocol handler initialized
[ 2576.607765] IR Sony protocol handler initialized
[ 2576.644941] IR MCE Keyboard/mouse protocol handler initialized
[ 2576.720781] lirc_dev: IR Remote Control driver registered, major 251
[ 2576.725057] IR LIRC bridge handler initialized

For now, I am going to trust that the chip and type version found is the one displayed: type 9135 and version 01

[ 2576.131053] it913x: Chip Version=01 Chip Type=9135

Then, I look at the message about the firmware file:

[ 2576.182035] dvb-usb: did not find the firmware file. (dvb-usb-it9137-01.fw)

First of all, I get the .fw file directly from github and attempt to copy to the required folder

cd /lib/firmware

sudo wget -o dvb-usb-it9137-01.fw

However, this results in an error in dmesg like the following:

[ 1819.861719] dvb-usb: downloading firmware from file 'dvb-usb-it9137-01.fw'
[ 1819.862468] it913x: FRM Starting Firmware Download
[ 1820.268051] it913x: FRM Firmware Download Failed (ffffffed)
[ 1820.468160] it913x: Chip Version=2b Chip Type=0203

The reason is that the firmware is only one component for activating the device.  There is another set of components that needs to be compiled and installed.

Then I go to Ubuntu’s help website on the specific page for this subject and follow these instructions:

sudo apt-get update

sudo apt-get install git linux-headers-$(uname -r) build-essential patchutils libproc-processtable-perl

cd ~

git clone git://

cd media_build


sudo make install

What will happen is that a good number of files were compiled to create what look like specific drivers for DVB-T devices called v4l, short for Video for Linux or Video4Linux.

This is what I can see what the installer is doing:

  • files are being compiled into *.o objects using gcc

While compiling, I get the following errors:

/home/ubu/media_build/v4l/v4l2-of.c: In function 'v4l2_of_parse_csi_bus':
/home/ubu/media_build/v4l/v4l2-of.c:38:4: error: implicit declaration of function 'of_prop_next_u32' [-Werror=implicit-function-declaration]
/home/ubu/media_build/v4l/v4l2-of.c:38:9: warning: assignment makes pointer from integer without a cast [enabled by default]
cc1: some warnings being treated as errors
make[3]: *** [/home/ubu/media_build/v4l/v4l2-of.o] Error 1
make[2]: *** [_module_/home/ubu/media_build/v4l] Error 2


Apparently, this means that I need a more modern kernel that can understand the 0f_prop_next_u32 option.

I had to upgrade my kernel while being on Precise to a Raring Ringtail distro kernel (3.8).

After that, I started the build above again by running:

cd ~/media_build
sudo make clean

This clears the failed compilation and starts to compile again

Finally, I installed the components

sudo make install

Additional resources wiki page

Categories: hardware, multimedia Tags:

Correct way to install the Adobe Flash Player in Firefox in Lubuntu

May 8th, 2014 1 comment

Instead of installing the plugin by navigating to the Adobe website, it is a much better idea to use the built-in apt-get package for it.

sudo apt-get update
sudo apt-get install flashplugin-nonfree

This is followed by restarting Firefox

Categories: multimedia Tags:

Resize image from the command line in Ubuntu

December 30th, 2013 No comments

This is the command for resizing an existing image  such as when you need to produce thumbnails.

I wanted to create 500px, 400px and 250px images, so I used the command:

convert <source file> -scale <scale in pixels> <destination file>


convert sample.jpg -scale 500 sample.500px.jpg
convert sample.jpg -scale 400 sample.400px.jpg
convert sample.jpg -scale 250 sample.250px.jpg


Categories: bash shell scripting, multimedia Tags: