Infoseite // Urgently need expert advice to HD 720p

Frage von bluebandit:


Hello,

'm a beginner in the field of HD and have the following questions:
- What do I need pixel format for 720p (and 30 fps) to choose? Square pixels, as in FullHD (; 1920 x 1080)?
- What data rates are ( "normal" 720p movies, constant bit rate)?
- Are there any special computer configurations for playback of Full HD 720p-and-shoot (; for example, an Intel Celeron M 1.0 GHz with 256 MB of RAM efficiently) enough?
- Due to a special computer configuration, the films are s.Compact flash cards played (; Read 15 MB / s, write 12 MB / s). Are these all powerful enough on the data rates?

A thousand thanks for your help.

Gruss, M.



Antwort von LarsProgressiv:

Hello M,

I'll try 'time to answer the questions:
"blue bandit" wrote: - What do I need pixel format for 720p (and 30 fps) to choose? Square pixels, as in FullHD (; 1920 x 1080)?

usually square pixels, even
"blue bandit" wrote: - What data rates are ( "normal" 720p movies, constant bit rate)?
You can not say that. My camera is characterized in the print resolution and 30 frames per second with a data rate of 9 Mbps in H.264 on. This, however, highly dependent on the model.
"blue bandit" wrote: - Are there any special computer configurations for playback of Full HD 720p-and-shoot (; for example, an Intel Celeron M 1.0 GHz with 256 MB of RAM efficiently) enough?
This in turn depends on the codec. MPEG4 Part2 (; eg XVID) should still be playable. In H.264, AVCHD, or the calculator is probably already borderline if not too slow.
"blue bandit" wrote: - Due to a special computer configuration, the films are s.Compact flash cards played (; Read 15 MB / s, write 12 MB / s). Are these all powerful enough on the data rates?
So my 9Mbps = 1.125 MB / s. There are therefore still available reserves.

Regards
Lars



Antwort von bluebandit:

Hello Lars,

Many thanks for your info.
Use Final Cut Pro Applre as ProRes 422 codec.

Meanwhile, I'm very insecure and suspicious of what (the aforementioned hardware, Intel Celeron M 1.0 GHz) and the CF card terms. As I have understood this to sound s.der CF card from a Windows XP Embedded incl all film content. I spent the movies with a data rate of 15Mbit / s.

Synonymous but I already converted the bits in bytes betr the data rate of the CF card and for me the bill risen synonymous (; is there really still say normally would reserve his availability) at 15 MB / s when reading.

Gruss, Micha



Antwort von robbie:

720p has 1280x720px! far away of 1920x1080!



Antwort von bluebandit:

Hello Robbie,

to which question was your answer?
It is clear from the format completely different than 720p-HD ...

Gruss, Micha



Antwort von deti:

"robbie" wrote: 720p has 1280x720px! far away of 1920x1080!
Be "far away" is relative, because at 1080i it already would require a Stillimage to the full resolution of 2,073,600 pixels to have a motive.
The actual resolution per half frame is only 1920 x 540 = 1036800 pixels versus 1280 x 720 = 921,600, which represents approximately 89% of 1080i. ;-)

Deti



Antwort von Axel:

"deti" wrote: "robbie" wrote: 720p has 1280x720px! far away of 1920x1080!
Be "far away" is relative, because at 1080i it already would require a Stillimage to the full resolution of 2,073,600 pixels to have a motive.
The actual resolution per half frame is only 1920 x 540 = 1036800 pixels versus 1280 x 720 = 921,600, which represents approximately 89% of 1080i. ;-)

Nevertheless, these figures suggest the videographer to 1080i (at best; Stillimage) more than twice as sharp, at worst (; movement) but still up 11% sharper than 720p. The first part is true, the second is not. The preparation of a frame from 1080 staggered stripes synonymous with the best possible TV sets only to the extent that the subjective impression of the picture is identical. Always assuming there was no camera movement. Then the whole Halbbildsalat is a mess and the calculated average value is very vague. And, always assuming you have set the best TV. (In the motion, motion picture) has 720p ahead.

So you would with 1080p on the secure page. But only insofar as it is sharper than 1080i. Comparison of the 720p and 1080p, you should perform their own critical views. The test could show that 1080p (, ~ 2 million pixels though) is slightly sharper than 720p (, ~ 1 million pixels), but very. In a HDV cam (; can eg AGM 20/30 ff) is the account of the 1440 Resolution (, ~ 1.5 million pixels) still explain well, but with the Full HD Cams? Prefer each his own conclusions. And perhaps even their own test results quite different. Separate tests are not replacing anyway.