Archive for ‘Linux’ Category
Posted on 19:04, November 1st, 2010 by Many Ayromlou
If you try to install Ubuntu 10.10 under parallels desktop 6.0 on OSX — atleast as of the writing of this article — you’ll soon discover that although your entire installation is done in a high (eg: 1920×1080) resolution, as soon as the install is done and you reboot, your VM is stuck at 1024×768. You can install the parallel tools using the menu option and it still won’t help — although it helps with 3D (ie: compiz). Under Gnomes System/Preferences/Monitors the highest resolution available is 1024×768 :-(. After searching around the net for the past week or so and trying just about every remedy — which did not work — I was about to give up, then I found the magic command that “makes it go” :-).
I’ve now got Ubuntu 10.10 running with PT/compiz under parallels 6.0 @ 1920×1080. No problem. Normally if you go inside ~/.config/ directory (.config folder under your home directory) you’ll notice that there is no “monitors.xml” file in there. That’s the per user X config file that gets the ball rolling. Generating the file is really easy. Open a teminal and issue the following command:
This will generate (hopefully) the following output:
Note that 1024×768 is the default. Now if you go inside ~/.config/ directory you’ll find a “monitors.xml” file (below). Once you’ve got this file you can go to System/Preferences/Monitors and choose the higher resolution options (eg:1920×1080). The xrandr command should generate the file for you. If it doesn’t (not sure why), here is my version for parallel 6.0. I think it’s pretty generic so you should be able to cut and paste the content:
Posted on 14:10, November 1st, 2010 by Many Ayromlou
If you’ve recently installed Ubuntu 10.10 and have installed Nvidia and/or ATI drivers — or installed ubuntu under emulation — you’ll end up with a (butt) ugly splash screen. In my case under parallel 6.0 I ended up with a text boot screen that just read “Ubuntu 10.10″……Ughhh. Here is a quick tutorial on how to get a nice splash restored. This procedure also works in 10.04. Keep in mind that I’m doing everything with 1280×1024 screen size. your mileage might vary (ie: you might want 1024×768). You’ll need to get a terminal session opened for this:
Your /etc/default/grub file should look like this once you’re done (partial screenshot):
Your /etc/initramfs-tools/modules file should look like this once you’re done:
Reboot and Enjoy :-)
Posted on 13:36, March 5th, 2010 by Many Ayromlou
In this guide I’ll show you how to stream live HDV/DV video to your iphone using a linux box (Ubuntu 9.10) with firewire input running vlc/ffmpeg and a Imac with OSX 10.6.2 running mediastreamsegmenter and apache2.
Start out with the iPhone streaming media overview. Without understanding this document you’ll have a hard time getting things working.
First things first, you need to have a working Ubuntu 9.10 machine. I’m using a small footprint 2.4Ghz Core2Duo machine with PCI firewire 400 card in it. For video input I’m using a Canon HV30 set to HDV mode (1080i/60) connected via firewire.
Next you need to follow the instructions on this page (steps 0-5) to get a working ffmpeg with x264 and aac encoding. Without this working you’re not going anywhere….sorry. If you’re trying this on a different Ubuntu installation follow the other links to get a working ffmpeg setup.
Then install vlc using “sudo apt-get install vlc“. I used vlc as my encoder frontend as I understand it better than ffmpeg. You can use just straight ffmpeg as well if you can figure out how to get it to encode the live HDV stream over firewire.
You’ll also need dvgrab utility. Install it using “sudo apt-get install dvgrab“.
Now we want to make sure the internal firewire module is working so type this command and see if you get a vlc window with the camera output in it (make sure you turn the camera ON and hook it up first).
Next we need to create a media stream out of our linux box and ship it over UDP to the Imac. The vlc command below gets the job done. Remember you’re sudo’ing and need to provide the password after you enter the command.
So now we can go over to the mac and see if we receive the video stream. For that just run VLC for OSX and open UDP network port on port 1234 (udp://). If things are working nicely you should see a 320×240 video from you HDV camera on the Imac.
Now that we have the video on the mac, we need to use the “mediastreamsegmenter” command line tool to create HTML5 video stream out of it. mediastreamsegmenter listens on a UDP port for incoming transport stream chops it (by default) into 10 sec. “mini” transport stream files and writes these mini files to wherever you tell it. This location is important since it needs to be accessible to your webserver. Remember, at the end of the chain (day), the webserver is doing all the heavy lifting of delivering the mini transport stream files to your iphone. mediastreamsegmenter also produces a file of type .m3u8
Something you might not know is that apple ships standard OSX with apache builtin. All you have to do is use the following command to get it started.
Now you should be able to open up your browser on your iphone/ipod touch and punch in http://192.168.1.97 (assuming the Imac is reachable from your phone) and see the streaming video (You might have to turn on “Plugins” feature under settings/safari on your device. Mine was turned off and drove me crazy until I figured it out). If Plugins is turned off, the index.html page will load, but no video.
Hopefully there is enough meat here to get you guys started……btw. I hear the following command (or variations of) can be used on linux side (instead of vlc). I haven’t tried it and can’t confirm if it works.
Some excellent information can be found on Carson McDonald’s blog: