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GeneralRe: Rendering/Vectors etc.. Pin
Tim Craig6-Feb-08 21:41
Tim Craig6-Feb-08 21:41 
GeneralRe: Rendering/Vectors etc.. Pin
Nevi6-Feb-08 22:23
Nevi6-Feb-08 22:23 
QuestionShow SVG in a form Pin
kns5-Feb-08 8:36
kns5-Feb-08 8:36 
GeneralRe: Show SVG in a form Pin
Mark Salsbery5-Feb-08 8:57
Mark Salsbery5-Feb-08 8:57 
GeneralDifference between mpeg4 SD and mpeg4 HD Pin
Sugantha2-Feb-08 0:59
Sugantha2-Feb-08 0:59 
GeneralRe: Difference between mpeg4 SD and mpeg4 HD Pin
Tim Craig2-Feb-08 9:19
Tim Craig2-Feb-08 9:19 
GeneralRe: Difference between mpeg4 SD and mpeg4 HD Pin
Sugantha3-Feb-08 22:48
Sugantha3-Feb-08 22:48 
GeneralRe: Difference between mpeg4 SD and mpeg4 HD Pin
El Corazon4-Feb-08 6:26
El Corazon4-Feb-08 6:26 
Sugantha wrote:
Thanks for your reply.But I want to know what will be difference in the picturization or resolution or aspect ratio or any other difference between them..


the difference is more related to the level of compression.
SD=640x480 or 720x480 (approximately...) and there is the interlace and progressive issue, most SD are interlaced, which halves the data on the 30hz cycle and alternates the frame such that 60hz signal is generated. You are never looking at more than half the picture as "new" but since the other half is kept around it looks higher quality than you think it is.

HD is more difficult because you have 720i/p vertical and 1080i/p vertical and you have wide and standard aspects. But we will assume it is the max HD with 1920x1080p

The screen then has about 6.75 times more pixels of detail. Six times detail is a lot of information. BUT, since you also have compression issues.... if you keep the compression the same, you need about 6.75 times the storage space for equal compression level videos on SD and HD. But if you increase the compression on HD you can store a signal in the same space by increasing the compression 6.75 times (approximately -- mpeg is never linear).

so it really comes down to the video source. crappy source expanded big looks worse because the extra 6.75 times resolution you can see more of the errors in the lossy compression (called compression artifacts) and SD has fewer pixels so doesn't show as much compression artifacts. If you have equally compressed signals (equal error rate on lossy compression on a per screen basis), then HD will always win because of the larger amount of detail (more detail, more sharpness, easier on contrast, etc.). But in reality, it is often a combination of different compression and different resolution, and never the two are exactly the same for any given movie. So the answer varies depending on your source and comparison.

To make matters more interesting, HD now encorporates the possibility for 48bit color (16bits R, 16bits G, 16bits B), and SD has no ability to display more than 24bit, so now HD is capable of holding twice the color depth, twice the contrast, etc. Again depending on your source. Comparing 48bit HD video to 24bit SD video is really an apples to orange comparison, if the compression ratio is run in the wrong direction SD really doesn't stand a chance. mmmm I love apples.

HD is simple higher density all around, but it realy still matters what you compressed and how much you compressed it.

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

GeneralRe: Difference between mpeg4 SD and mpeg4 HD Pin
Sugantha6-Feb-08 3:08
Sugantha6-Feb-08 3:08 
GeneralPlace DIV TAG in the CENTER of MONITOR Screen Pin
Member 184312630-Jan-08 6:00
Member 184312630-Jan-08 6:00 
GeneralRe: Place DIV TAG in the CENTER of MONITOR Screen Pin
Pete O'Hanlon1-Feb-08 10:03
mvePete O'Hanlon1-Feb-08 10:03 
Questionhow to play .tga (targa) files Pin
Antonyemac29-Jan-08 17:52
Antonyemac29-Jan-08 17:52 
AnswerRe: how to play .tga (targa) files Pin
led mike30-Jan-08 5:41
led mike30-Jan-08 5:41 
GeneralLine drawing algorithms like the ones used in Visio Pin
Sriram Srivatsan29-Jan-08 2:59
Sriram Srivatsan29-Jan-08 2:59 
GeneralRe: Line drawing algorithms like the ones used in Visio Pin
Maximilien29-Jan-08 8:25
Maximilien29-Jan-08 8:25 
GeneralMaking sure my my custom control is always on top Pin
Sampson Orson Jackson28-Jan-08 3:09
Sampson Orson Jackson28-Jan-08 3:09 
GeneralRe: Making sure my my custom control is always on top Pin
Mark Salsbery28-Jan-08 7:12
Mark Salsbery28-Jan-08 7:12 
GeneralRe: Making sure my my custom control is always on top Pin
Sampson Orson Jackson28-Jan-08 20:33
Sampson Orson Jackson28-Jan-08 20:33 
GeneralRe: Making sure my my custom control is always on top Pin
Sampson Orson Jackson28-Jan-08 20:34
Sampson Orson Jackson28-Jan-08 20:34 
GeneralRe: Making sure my my custom control is always on top Pin
Mark Salsbery29-Jan-08 5:18
Mark Salsbery29-Jan-08 5:18 
GeneralRe: Making sure my my custom control is always on top Pin
Mark Salsbery29-Jan-08 5:22
Mark Salsbery29-Jan-08 5:22 
GeneralRe: Making sure my my custom control is always on top Pin
Sampson Orson Jackson29-Jan-08 6:21
Sampson Orson Jackson29-Jan-08 6:21 
GeneralRe: Making sure my my custom control is always on top Pin
Mark Salsbery29-Jan-08 7:46
Mark Salsbery29-Jan-08 7:46 
GeneralRe: Making sure my my custom control is always on top Pin
Sampson Orson Jackson29-Jan-08 21:26
Sampson Orson Jackson29-Jan-08 21:26 
GeneralRe: Making sure my my custom control is always on top Pin
Sampson Orson Jackson29-Jan-08 21:55
Sampson Orson Jackson29-Jan-08 21:55 

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