links for 2009-03-19

20 03 2009
  • Since this is beyond a doubt one of the most often asked questions, it certainly deserves an answer. The default settings will very likely get you good to excellent results on 'normal' source material like DVD's. If you like a more thorough answer than 'just stick with the defaults' you can follow some of the guidelines mentioned below.
    However, they are not the 'ultimate' settings for everything as there's simply no such thing. Feel free to deviate (yes, become a deviant!) and experiment with the settings once you feel more confident using XviD. Using XviD always requires you to use your own judgement up to a certain point. The settings below are very safe and are here just to get you on your way.
  • You have three options here. MPEG sharpens the image, and is good for basic high-bitrate (>1000kbps) encodes, and H.263 softens the image which is better for medium-bitrate (800-1000kbps) encodes. The last option allows the entry of your own custom quantization matrix, which is recommended to maximize quality.

links for 2009-03-18

19 03 2009

links for 2009-03-14

15 03 2009
  • … Linux needs root privileges. Therefore, you have to have root privileges when starting Wireshark, else you can't capture data. Please note that you don't have to login as root when starting your computer, you can use su(1) or sudo(8) for that purpose. However, this remains unsecure as the dissectors, the parts of Wireshark which parse the captured data, run with root privileges as they did before. A much safer solution would be to su(1) to root, then use the bundled dumpcap to dump the data (for example, you can evoke dumpcap by using "dumpcap -w ./dumpfile", which will dump the packets to the file "dumpfile" in the current working directory. See "dumpcap -h" for details). You could also use tcpdump for this purpose. The advantage of this solution is, while dumpcap/tcpdump still run as root, you can run Wireshark as a ordinary user and load the data you captured previously, so effectively this is kinda "privilege separation by hand".

links for 2009-03-13

14 03 2009

links for 2009-03-12

13 03 2009

links for 2009-03-10

11 03 2009

links for 2009-03-09

10 03 2009