Archive for the ‘Video Technology’ Category

The age old question: LCD or Plasma?

Wednesday, May 23rd, 2007

I visit a lot of forums, and I have yet to visit one where the question “LCD or Plasma” hasn’t bee posted yet. When buying a new TV, this question will inevitably come up, so here are some tips to help you choose.

Why you should buy an LCD?
Plasma only comes in 42″ or above sizes, so if you want something smaller, LCD is your only choice. LCDs will usually have a brighter picture (higher contrast), and more vibrant colors (although not to everyone’s taste, some say the colors are unrealistic). The better brightness helps if your screen is placed in a bright room.

Why you shouldn’t buy an LCD?
Older LCD panels suffer from motion blurring, due to the high response time of the panel. Newer models have response times less than 8ms, and so suffer less (but still do suffer) from the problem. Viewing angles (both vertical and horizontal) can be a big problem, especially with a large size screen – even when sitting straight in front, the edges might be less visible/brighter than the center, but again, newer models will suffer less from this problem, if at all.

Why you should buy a Plasma?
In 50″ or above sizes, plasma panels still represent the better value for money. Plasma technology has been around for a while now, most models are in their 7th or 8th generation, and so the technology has matured quite a bit. Some prefer plasma’s more natural contrast/brightness, although you will need a more dedicated home theatre environment (ie. darker room) to enjoy it as its best. Viewing angle is amazing on a plasma, as good as a CRT in practical terms.

Why you shouldn’t buy a Plasma?
Plasma screens can sometimes offer blacks that are more gray due to the inherent nature of the technology (although newer models have ways to reduce this problem). Motion judder can also be a problem with plasma screens. Then there is the issue of plasma burn in, which is not as serious as most people think. Early panels suffered from this, but this is a non issue with most newer panels. Some screens suffer from temporary burn-in, but it usually goes away after you switch of the panel for a while or watch something else. What most people fail to realise is that old CRT TVs suffers from burn-in much more so than plasmas ever will, and LCDs do suffer from burn-in as well.

The best way to find out which is suited to you is to go to your local electronics store and see which screen grabs your attention the most. Of course, this relies on the store having set up these screens properly, but you should get a good idea. Stores usually have very harsh lighting, and this will favor LCDs more, so keep this in mind. And if possible, ask them if you can bring along your own equipment to test these TVs, for example bring your Xbox 360 and see how games play on it.

New H.264 website

Saturday, May 19th, 2007

In collaboration with a friend of mine, we’ve started a new website called H264info.com. It’s a small website that talks about H.264 and provides information, links, instructions and downloads for H.264.

I’m a huge fan of H.264. It’s taking a video compression format like DivX or XviD, and then adding even more compression on top of that – you can get a 25% file size reduction with very little quality difference. Best of all, unlike (in my opinion anyway) DivX or XviD, H.264 scales well up as well as down – 1080p clips look amazing (check out The Simpsons Movie 1080p trailer for yourself if you don’t believe me).

Apple is using it (see Steve Jobs getting excited over it here). Blu-ray and HD DVD are using. So is Sony in its PSP. Even Microsoft, with their competing VC-1 format, has jumped on board by adding support for it on the Xbox 360.

So why isn’t everybody else using it? Part of the problem is that it’s still relatively difficult to get H.264 movies to play on your computer, and the other is that most people don’t know about it. h264info.com will hopefully try and solve these problems.

H.264 on the Xbox 360

Thursday, May 10th, 2007

Following on from my previous blog entry on Xbox 360 H.264 playback, I’ve finally had the chance to test it out when the Spring Update was released yesterday.

So far, it’s a mixed bag, mainly due to niggly issues related to MP4 media sharing (or the lack of) in Windows Media Player.

What I have found so far:

  • Use the Zune software for media sharing, since it supports MP4
  • Use Baseline or Main Profile, since Zune only seem to support these
  • If you are using the Sharktooth’s x264 profile in MeGUI, you have to set the max bitrate to 10000 (from 25000), enable the Level restrictions to 4.1 (you will have to turn off “P4x4”)
  • Use AAC LC encoding, not HC. I used the Nero Digital encoder, LC 96 Kbps profile
  • When using the “AutoEncoder” function in MeGUI, try to make sure the “average bitrate” (even if you are using a set file size) doesn’t go too close to the 10 Mbps limit for the Xbox 360. From what I can understand, frames over 10 Mbps will still play, but artifacts and paused playback may result
  • Edit (11th May, 2007): With 1080p clips, use Baseline only
  • 720p, 1080p works well, as long as you stick to the restrictions above

No doubt I will know more tomorrow after more testing of 1080p, and I will have a guide written before the week’s end.

The playback quality is quite good, as expected with H.264, and I would really like to see some more TV episode downloads being released in this format ready, encoded to be compatible with the Xbox 360.

Edit (11th May, 2007): I have finished writing the Xbox 360 H.264 Conversion Guide.

And I’ve finally churned away from iiNet to Internode as my ADSL provider (reasons listed in this blog entry). I’m now downloading at more than 600 KB/s and uploading at around 40 KB/s, much better than my previous 155 KB/s and 26 KB/s. When I first connected, I was only doing 250 KB/s, until I used Unblocka to tweak my connection.

Make your own DVDs and Windows Media Encoder

Tuesday, May 8th, 2007

I’ve just finished writing a guide for DVD Flick. DVD Flick is a really easy to use tool, especially for making DVDs from your DivX/XviD files (TV episode downloads anyone?). Best of all, it’s free.

It won’t create DVDs with beautiful menus and other fancy features, but things like multiple audio tracks and subtitles are not too difficult to add in. The output quality is quite good as well, although this largely depends on the quality of the source file. Give it a try and I think you’ll be impressed.

The other guide I wrote is about AVI to WMV conversion, trying to make these files playable on the Xbox 360. I used the free Windows Media Encoder 9 software, which unlike DVD Flick, is not as straight forward or well designed. It will work well when the input file is “Microsoft approved” (ie. WMV files), but for anything else (like DivX/XviD), it can cause a lot of problems. The software itself is quite powerful, with support for a lot of different types of encodings, including streaming and VC-1, but you can just feel that it wasn’t really designed for use by your average/newbie user (which is no surprise then that the URL for the software on Microsoft’s website has changed to add “forpros” in the URL), unlike DVD Flick.

DVD Pet Peeve #3

Sunday, April 22nd, 2007
NTSC Warning … not very visible or helpful
NTSC Warning (circled in red) … not very visible or helpful

Why do studios insist on releasing NTSC content in PAL regions? Is it because they are lazy? Cost savings? Or just because they don’t give a rat’s arse about people who actually pay their salaries (us, the customers)?

A lot of people still don’t have equipment that can play or display NTSC content, and is it really that hard to produce a new transfer for the PAL regions, especially when there are so many countries that uses PAL (Europe, UK, Australia). Notable NTSC releases in Australia includes The Goonies, Willy Wonka and The Chocolate Factory (only the full-frame version is available as well) and my recently purchased copy of Dilbert: The Complete Series. Often, the NTSC warnings are not very visible nor helpful, since most people don’t even know the NTSC/PAL difference (nor should they be expected to know).

On a related note, if you have a Pioneer Plasma that has PureCinema mode, you should have an “Advanced” option which basically does 3:3 pulldown, playing back 24 FPS content at 72 Hz. 3:3 pulldown triples every frame to get the required 72 Hz refresh rate, and what you get is a slightly smoother picture compared to standard 2:3 pulldown (the “Standard” PureCinema mode) . I use this mode to play back all my NTSC DVDs. For my (3 year old) model, 3:3 pulldown only works when the input is interlaced, so I have my upscaling DVD player set to 1080i 60Hz mode when playing back NTSC discs, and then enable 3:3 pulldown – the improved smoothness of panning is immediately noticeable. PAL discs are at 25 FPS, so I set the DVD player to 720p (native resolution of the TV) @ 50 Hz.