On Oct 12, 2004, at 10:32 PM, [EMAIL PROTECTED] wrote:Figure that a standard DVD-R holds about 4.7 GB data (+/- formatting). If I go the "data disc" route, then I can stash 2 to 4 movies per disc. More if I use DivX [*]. If I go the "DVD" route (format 'em to play the discs in a DVD Player hooked to my TV) then a movie might take two discs, because it has to be uncompressed quite a bit.
You got this pretty well, but let me clarify a bit. A standard DVDr using regular DVD player compatible bitrates and MPEG-2 will hold two hours on a single layer-single sided disc. Dual layer will hold just under four hours. A decent quality (better than VHS, not as good as DVD, maybe around the same as a VCD) DiVX file will use around 200MB per half hour. Seeing as a DVD holds approx 4.4GB (4.7 if you don't include file system overhead) that means you get around 11-hours of video on a single disc. The exact amount will depend on the DiVX file size.
Ah. Thx Rob! This was detail I didn't have yet!
Technically, DiVX was released well before the specs for MPEG4 was ever finalized. It's more of an offshoot of MPEG4 than an enhanced version. I can't speak for the speed issue of the DiVX decoders, but I have no problem with good quality files on my G4/400.
Does anyone have a copy of the "DivX 5.0 Alpha 3" decoder?
In my s/w upgrade processes on my PM 7300/180, I went to QuickTime 6 and the full-release DivX 5.0.5 codec then to 5.1.1. blech. What garbage. It's such pig-ware now that it displays only a window full of pixelatedartifactcorruption garbage. I want to revert to the Alpha 3 version, but I can't find it! :(
The same way a 128kbps MP3 can't compare to a 128kbps AAC file.
Now, ACC is an interesting mess. I was totally unimpressed by it; IMO the ACC files you get from the iTunes store are a major rip off!
AAC is MPEG-4, Advanced Audio Codec, by Dolby Labs. Supposedly it reproduces higher quality sound than mp3.
But most of my mp3 files sound far better than the same track as ACC!!!
CD Audio is digitally sampled at 1,378 Kbps. Apple's iTunes ACC files, bought from their online store are sampled at 128 Kbps. A 128 Kbps slice out of 1.3 Mbps! The low sampling rate, and subsequent lower fidelity, is specifically to keep the files small, for devices like iPods - where you listen with ear buds not high quality speakers.
But then the other day, a friend gave me an ACC file that he'd created using a higher sampling rate. It's slightly smaller than the mp3 version I have but sounds almost indistinguishable from the original CD! And far superior to the mp3...
- Dan.
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