Mother
Aug 2003
Bitter, miserable twat.
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Poss. way of reducing JPEG bandwidth
On an SVCD, the video resolution is 480x480 NTSC (480x576 PAL). When played, the player stretches the picture to achieve a 4:3 aspect ratio*, if viewed on a PC this is equivalent to an image of 640x480 (768x576). Most of the time the JPEG images on VCDQuality are of these dimensions; the file sizes are around 40-45kB.
My idea is this: instead of taking a screenshot from PowerDVD (or whatever) playing the file in it's correct AR, why not make the JPEG from the 480x480 image directly off the SVCD, and write the HTML source so that the browser resizes the image? i.e. <img width=640 src="idxxxxx.jpg">
I reckon the file sizes would be approx. 25% smaller at around 30kB. Not much to look at, but when you think that a popular JPEG can get 50,000 views in a week, the bandwidth savings may start to add up.
The only disadvantage I can think of is that the VCDQuality "watermark" may be blurred because of the resize, but the picture itself should be more or less identical to a screenshot taken from PowerDVD (where the player is doing the resizing).
* technically other ratios such as 16:9 are possible, but 16:9 SVCDs are very rare - I have only ever seen 2, one a non-scene release on usenet and the other was nuked for bad AR. In fact, they probably don't comply with scene rules because some standalone players don't like them, which is a shame because the quality is better (i.e. "jaggies" not as prominent)
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08-27-2003 12:44 PM
