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Old 6th September 2010, 09:50   #1  |  Link
sLiD
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Problem with PSP

Hi.
I found this problem about one month ago.

Please look at the pictures below.



Look closely around the forehead and the lips.


As you can see, there are some block lines.(stairs lines? I don't know its technical term.)

I used MeGUI to encode that movie.
Now I will show you my MeGUI's settings.




This problem is most visible when the color is red.
When the color is another color, this phenomenon doesn't seem to occur.



Compare red with sky-blue
And look at the small holes inside the tires.(near the nuts.)
You will see the difference between the two.




This pictures are a scene of the Evangelion movie.
Maybe you can exactly see what is problem.


Look at the bottom.
Red building's lines are not smooth although green lines is smooth.


All of the pictures are captured in PSP(not PC)
So... How can I fix those problems?

Please help me.


Additional pictures.

Hair line.


Eyes.

Last edited by sLiD; 6th September 2010 at 11:46. Reason: Add some pictures
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Old 6th September 2010, 10:01   #2  |  Link
J_Darnley
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Use a better renderer... oh you're using a PSP. I guess you're stuck with it then. The chroma subsampling a a feature of the colourspace all videos you can play on the PSP.
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Old 6th September 2010, 11:50   #3  |  Link
Atak_Snajpera
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Blame sony for lack of chroma upscaling.
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Old 6th September 2010, 14:37   #4  |  Link
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Yeah, that's just bad YV12 to RGB conversion.

The only way to make that look better is to encode into 720x480 or similarly 'bigger than native' resolution (so that the PSP has more information from which to create your 480x272 RGB picture).

TL;DR Blame Sony
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Old 6th September 2010, 14:52   #5  |  Link
Yoshiyuki Blade
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Indeed, I learned about the same issue on the Zune HD after asking around. Is there any particular reason they do this other than being completely ignorant? Anything to do with processing power, etc.?
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Old 9th September 2010, 03:02   #6  |  Link
sLiD
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Hmm...
All I have to do is blaming sony T.T
Any way, thank you.

P.S.
But... is still there anybody who can fix this problem, please help me.
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Old 9th September 2010, 06:27   #7  |  Link
Blue_MiSfit
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You can't do anything to the source that will fix this. The problem lies in poor YV12 -> RGB conversion during playback on the PSP. Sadly, unless there are homebrew media players that address this issue, you're SOL.

Derek
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Old 9th September 2010, 09:21   #8  |  Link
J_Darnley
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Quote:
Originally Posted by sLiD View Post
P.S.
But... is still there anybody who can fix this problem, please help me.
JEEB had a suggesstion. Did you try it?
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Old 9th September 2010, 20:18   #9  |  Link
SquallMX
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Quote:
Originally Posted by JEEB View Post
The only way to make that look better is to encode into 720x480 or similarly 'bigger than native' resolution (so that the PSP has more information from which to create your 480x272 RGB picture).

TL;DR Blame Sony
That's exactly what i do, using 480p "solves" the chroma up-sampling problem, obviously your encodes would need more bitrate.
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Old 9th September 2010, 21:29   #10  |  Link
Yoshiyuki Blade
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That sounds like a pretty decent solution. It would probably risk softening up the image too though, depending on the device's internal resizer.
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Old 10th September 2010, 06:27   #11  |  Link
sLiD
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Quote:
Originally Posted by J_Darnley View Post
JEEB had a suggesstion. Did you try it?
Yeah, I tried.
Also I solved the problem in that way.

But what I really want was solution of "480x272".

Anyway, Thanks!!
(Also thanks to JEEB )

Last edited by sLiD; 10th September 2010 at 06:30.
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Old 10th September 2010, 07:41   #12  |  Link
JEEB
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Quote:
Originally Posted by sLiD View Post
But what I really want was solution of "480x272".
Have fun rewriting the YV12->RGB conversion routines, if it's even possible (not sure what the API gives you actually, in the worst case it just gives you the already converted RGB data).
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