Archive for October, 2009
Fix the Dell Mini 10v Touchpad
So, my lovely Wife recently got a rather cute Dell Mini 10v.
It comes with a horribly stripped down version of Ubuntu 8.04 from Dell pre-installed. Luckily, however, that can be ripped out and a nice new install of 9.04 can take its place and it all works wonderfully….except the touchpad. To save space, Dell has used a horrible touchpad that integrates the two left and right mouse buttons into the touchpad itself, so when you go to click on something, you actualy end up moving the mouse at the same time. I was amazed that no one mentioned this in any of the reviews about the mini 10v, I guess everyone was embarrassed since they thought it was just them and they had fat fingers! Luckily, the Open Source Ubuntu community being what it is, there is a fix out there.
If you follow this post there is a clear step-by-step guide telling you how to download some specialised drivers for the touchpad that disable the lower portion of the touchpad, so that it works just as a left and right mouse button and not as part of the touchpad. THANK YOU. My Wife was getting ready to throw her netbook out the window until I found that fix. Be warned though, it only works on the 9.04 (and hopefully later) versions of Ubuntu and not on the version of Ubuntu that comes pre-installed, so you will have to install a new normal version of Ubuntu from their website first (though this is a simple process). I hope this helps some one else and allows them to love their Mini 10v, not hate it!
Stop snort detecting local traffic
I use the rather excellent and Open Source snort to help monitor and protect my network. However, it was causing muchos havoc with my VNC, SSH and samba connections. I found out this was all down to (as is sadly normal for most opensource projects) confusion related to the configuration.
In the snort.conf file, you are meant to set you home network (the place you are protecting, but don’t want to detect), using
HOME_NET XXX.XXX.X.XXX
And then your external network (the place where attacks might come from and do want to detect) using
EXTERNAL_NET XXX.XXX.X.XXX
Now, the method the configuration and snort documentation tells you to use is, to basically tell snort that anything that isn’t in your home network is in your external nework, so
EXTERNAL_NET !HOME_NETWORK
The exclamation basically meaning NOT. However, if you put an IP address string as your home network, for example (as is suggested in the configuration)
HOME_NET 192.168.1.1/24
for some reason, using !HOME_NETWORK for your external network doesn’t work and snort will happily go and detect all traffic coming from your local network…GRR. Luckily, after some Googling I came across this message and found that the way to get EXTERNAL_NETWORK to work correctly was to use
EXTERNAL_NET [!192.168.1./24]
Finally, snort no longer goes ape about my local traffic and now only finds the retarded script kiddies from Russia and China and the Netherlands (since that is where most of the attacks I get come from) and blocks them. Thanks mailing list, no thanks snort.conf….
How To Use FFMPEG To Transcode Video For The PS3
So, it seems my last post actually wasn’t the best solution. Although using Mediatomb and VLC worked some of the time, often I found that the audio and video was out of sync, making it impossible to watch the movie.
So, I looked for another alternative. I already use HandBrakeCLI to transcode my videos, but that is essentially a front end to ffmpeg and x264. They are moving away from providing decent support for transcoding videos on the Playstation 3, so I decided to use ffmpeg directly. I used this guide to install the latest svn versions of ffmpeg and x264 on my Ubuntu 8.04 server. I then spent about two weeks trying to find an up-to-date command to actually use ffmpeg to create a PS3 compatible file. It seems most of the instructions on the web are way out of date and use commands that ffmpeg no longer accepts. Finally, after lots of trying I finally asked on the IRC channel #ffmpeg. This very nice dude called relaxed suggested the following:
ffmpeg -t 120 -i $input -vcodec libx264 -level 41 -vpre hq -crf 24 -threads 0 -acodec libfaac -ab 128k -ac 2 output.mp4
Sadly I had problems with this code, since the .mpg files I was using (I am now using MythTV instead of MediaPortal, but that’s another post) were not accepted by the libfaac codec.
However, with a little modification, I got the perfect command. So, without further ado, the best command I have found to convert ANY video accepted by ffmpeg into a PS3 compatible file using x264 that is good quality and low file size is:
ffmpeg -y -i "$1" -vcodec libx264 -level 41 -vpre normal -crf 24 -threads 0 -acodec libfaac -ab 128k -ac 2 -ar 48000 "$1".mp4
Obviously change $1 into your input file and “$1″.mp4 into your output file. If you want to send the command line output to a log file so you can see what is going in, use:
ffmpeg -y -i "$1" -vcodec libx264 -level 41 -vpre normal -crf 24 -threads 0 -acodec libfaac -ab 128k -ac 2 -ar 48000 "$1".mp4 > /where/you/store/your/logs/ffmpegprog.log 2>&1
Now, when I first saw this I thought, hey, its got hardly any switches (all the -XYZ stuff), therefore it must be cack. However, the key is the “-vpre normal” switch. This tells ffmpeg to use some of its built-in presets, or in this case built-in x264 presets that are created when you build x264 from SVN. I was initially told, as you can see from above, to use the “hq” preset, but I found this resulted in files that were quite big. Using the “normal” preset seemed to produce files that were of great quality compared to my original source (SD DVB-T transport streams in MPG format) but much smaller files size, for example, a .mpg transport stream movie that is originally 2.5GBs in size gets reduced to around 650 MBs, awesome.
So, this is the command I now use to convert all my videos. I also use comskip run via Wine to check for commercials and mp4box to mux in the chapter markers from comskip. Weirdly, I do find that when playing these resultant files via VLC they appear to have their audio and video out of sync, but on the PS3 they are fine. Whether this is due to me using an old VLC or my PC being too slow to play em, I don’t know, but hey, if it works.
So, if you are looking for the best ffmpeg command to transcode video files for the PS3 using ffmpeg and x264, I am pretty sure this is it.
As an aside, I also built HandBrakeCLI from SVN and it now also has a basic preset, called Normal, that also produces PS3 compatible files. I will play with them to see how they do, though I find that occasionally HandBrake can crash, and get stuck, so I try to avoid it. Sadly though, the HandBrake dev’s wont help you with this, since you are using the HandBrakeCLI and it is not the CLI that is crashing so they wont look into it for you. In fact (<rant>) I am really shocked at the rudeness and arrogance that the HandBrake devs demonstrate on their forum. I have read so many well worded and polite posts from confused people on their forums, where the devs (mainly a guy called jbrake) just answers back incredibly sarcastically and very rudely, providing little to no help. Maybe they get loads of annoying whiny posts from people who haven’t RTFM, but still, there is no need to be rude about it. In fact, that is the main reason I don’t want to use HandBrake, since I don’t like the attitude those guys have (</rant>).
Anyway, hope this awesome command for a recent SVN ffmpeg and x264 version to convert video files for PS3 works for you!