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2011-10-25
, 14:46
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Posts: 380 |
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Joined on Dec 2009
@ Slovenia
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#42
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2011-10-25
, 14:53
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Posts: 435 |
Thanked: 197 times |
Joined on Feb 2010
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#43
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I truly am because i'm willing to buy this device despite all the shortcomings it has.
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2011-10-25
, 15:18
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Posts: 1,033 |
Thanked: 1,013 times |
Joined on Jan 2010
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#44
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2011-10-25
, 15:31
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Moderator |
Posts: 5,320 |
Thanked: 4,464 times |
Joined on Oct 2009
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#45
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2011-10-25
, 15:39
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Posts: 1,259 |
Thanked: 1,341 times |
Joined on Oct 2009
@ Germany
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#46
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2011-10-25
, 15:47
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Posts: 380 |
Thanked: 459 times |
Joined on Dec 2009
@ Slovenia
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#47
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2011-10-25
, 15:58
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Posts: 1,033 |
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Joined on Jan 2010
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#48
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2011-10-25
, 16:09
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Posts: 343 |
Thanked: 819 times |
Joined on Jan 2010
@ Paris, France
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#49
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2011-10-25
, 21:01
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Posts: 1,427 |
Thanked: 2,077 times |
Joined on Aug 2009
@ Sydney
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#50
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A couple things to note: first, the "High-Definition" in HD video relates to the picture resolution, not the video compression bitrate. Indeed, a 720p HD video is still called a High-Definition video whether it is severely compressed to the point of unwatchability or totally uncompressed. (Most of the HD video I find on the net has a bitrate lower than DVDs!)
Second, the resolution of an LCD screen is fixed. If your screen has 854x480 pixels, you will be watching video at 854x480 resolution. A 720p (1280x720 pixel) or 1080p (1920x1080) video shown on this screen will obviously have to be down-scaled, or you'll only be able to see one corner of the picture at a time. Similarly, a 640x350 video will have to be up-scaled, or you will be seeing a tiny picture on just a part of your screen. All this down-scaling (or up-scaling) wastes CPU power (or whatever hardware you are using), and must naturally distort the native video to some degree.
What you want is a maximum quality picture with minimum distortion. Simply cramming data onto the machine that is inevitably going to be thrown away during the down-scaling process is not the best way to do this. The best way is to use a video encoding system to re-encode a high-resolution, low compression source video into the native resolution of your device at the lowest compression level (or highest bitrate) that your device can handle.
Again, I use handbrake for this. I use it both for the HD videos I get from the net (high-res, but heavily compressed) and for my library of DVDs (standard-def, but low compression), to squeeze the best quality I can get out of my source material before transferring it to the phone. Because Handbrake doesn't have to try to decode and re-scale the video in real time, and gives you fine control over the bitrate it will use, it can produce a video optimized for the phone that will, in fact, surpass the quality you would get by trying to run the native source video on the device.
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I believe this is what jakiman was talking about.
What you outlined is what most folks do... Problem is...
Devices like SGSII for e.g, will handle higher A/V bit-rates* for their res than the N9.
But then I guess you eventually get to a point of diminishing returns anyway.
*or just better (more efficient) CODECS
You want native res but at the highest bit-rate (or most efficient codec) your ph can handle.
If a ph can re-encode to perfect parameters on-the-fly & not even blink awesome, but I doubt many can.
I'd rather have good source material that I can re-encode exactly the way I want.
Then again I'm not inclined to be "leeching" heaps of content off the net.
In that scenario I guess "Begger's can't always be choosers".
That N900 720p playback you speak of was a very recent development.
As I understand it, it was possible thanks to files that originated from the N9/N950.
All it does is help the N900 do what the N9 does now...
Hopefully we'll eventually be able to OC the N9 to a point whereby it'll handle the most challenging formats.
The N9's OMAP3630 is basically a OMAP3430 die-shrunk to 45nm.
It's CPU/GPU/DSP's are clocked higher, & will have room for OC'ing beyond the N900's stable limits.
Last edited by jalyst; 2011-10-25 at 17:08.