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DM8000 Standard 1080p output

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dream75

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Tuesday, February 16th 2010, 2:15pm

DM8000 Standard 1080p output

Hello,

In the output settings through DVI/HDMI you can now only choose 720p or 1080i in your Dreambox settings.

This means for example that if the output is set on 1080i and you go to a 720p channel the Dreambox has to convert interlaced to progressive AND convert the resolution, this means 2 types of conversion in the Dreambox :( (the same is the case if you put the standard output on 720p and watch a 1080i channel).

A full HD screen has to convert the 1080i or 720p output from the dreambox to 1080p (because this is the native screen output). This means there can be a lot of conversions which are off course not good for the quality of the picture.

For example the Dreambox has been set to 1080i output and you watch a 720p channel, the following conversions occur:
1. Convert 720p to 720i (by Dreambox)
2. Convert 720i to 1080i (by Dreambox)
3. Convert 1080i to 1080p (by TV)
• These 3 conversion also apply if the standard output is 720p and you watch a 1080i channel

I know from the autoresolution plugin the Dreambox 8000 also supports 1080p. I would like to set the standard output of the Dreambox to 1080p so the number of conversions is limited to the very least necessary namely ONE (I know some of this can be set with the autoresolution plugin so only the TV does one conversion, but don't like to use this because when switching between channels who have different HD output I loose the picture for a few seconds because my TV is recalibrating to the new output format).

If the Dreambox outputs 1080p the TV doesn’t have to do anything more than show the Dreambox signal 1 on 1 on the screen (1080p, so no conversion). Also the dreambox has to only convert one thing (instead of 2 or 3 as mentioned above).
- If you watch a 1080i channel the Dreambox only has to convert from interlaced to progressive (and not the resolution, so only one conversion)
- If you watch a 720p channel the Dreambox only has to convert the resolution from 720 to 1080 (and no i/p conversion, so only one conversion)

Would this be possible to implement (1080p as standard Dreambox output)?

Thank you for an answer

Olove

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Tuesday, February 16th 2010, 2:33pm

won't work since the chip doesn't support 1080p50/60

So you'd have flickering images.
Grüße,
Olove

"All we need to do ... is keep talking (Stephen Hawking)"

Ich leiste KEINEN Support per PN/E-Mail, derartige Anfragen werden nicht beantwortet.
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MartiniB

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Tuesday, February 16th 2010, 5:46pm

and why 4:3 aspect ratio is so imposible to add in HDMI video modes?!
current all are 16:9

Source code

 
1
2

root@Dream8k_M3:~# echo `cat /proc/stb/video/videomode_choices`
pal ntsc 480i 576i 1080i 720p 480p 1080i50 1080p24 1080p25 1080p30 720p24 720p50 576p 640x480 800x600 1024x768 1366x768

miss

Source code

 
1

480i@4_3 576i@4_3 1080i@4_3


and if posible change only aspect ratio remark withour reset when change from
480i<->480i@4_3 or 576i<->576i@4_3 or 1080i<->1080i@4_3
Receivers: dm500; dm7020; 2x dm8000sstt <-Diseq1x4(1.0)<-3x Diseq1x10(1.1)<-
Dishes:
1.8m + 36E;28E;23E;19E;16E;13E;7E
1.6m + 42E;40/39E;36E
1.0m + 10/9E;5E;1W;8W
1.0m + 15W;22W;30W
1.1m + 12W;18W;24W
0.8m + 4/5W
1.1m + 53E;60E
1.0m + 75E;80E
TVs: Philips 42PFL9703h(LCD); Sony KV29c3d(CRT)

Jeroensky

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Tuesday, February 16th 2010, 8:31pm

I can imagine 4:3 isn't supported, because it's a bit outdated.

About no 1080p 50/60 HZ.
What a shame that the chipset doesn't support it, so their is no way of tweaking it(even with a cooling fan) in gpu (dvi) chip.

Anyway, how about:
1080p 25Hz
1080p 30Hz

And 1080p multi (where multi is a automatic switch between 25 & 30, so a 50Hz channel switch to 25, and a 60Hz channel switch to 30Hz.)
I mean the automatic resolution plugin supports 1080p 30Hz so i think it must work in the chip.

Is it true that h.264 is using another video chip then the main one in the DM8000 ? Is that one capable of 1080p 50/60Hz?

dream75

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Wednesday, February 17th 2010, 7:33am

I think Jeroensky has a good suggestion about the forum with at least the option to ouptut standard 1080p 25/30, is this possible?

Also the other question is a good one. Is it possible to do something with the BCM7400 chip (overclock/new drivers) that it would be able to also support 1080p 50/60?

I think when Blue Ray works on Linux (I suspect this will be the case in the near future) a lot of people would like to install a Blue Ray reader/burner in their DM8000. Then you would also need the complete 1080p format.

I think there will be a lot of comment if their EUR 1000 Dreambox can't even play Blue Ray disks in their native format while, for example, the much much cheaper DM500HD (or VU+ Duo) which both (will) have a BCM7404 chip that does support 1080p 50/60. Especially since this BCM7404 was available as off 2007, so a long time before the DM8000 was released which means the hardware to support it was available from the beginning (I therefore can't understand why this chip hasn't been used in your flag ship model). But that is no problem if this could be solved by overclocking or drivers.
I would love to hear DMM's view on this ;)

This post has been edited 3 times, last edit by "dream75" (Feb 17th 2010, 7:43am)

Olove

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Wednesday, February 17th 2010, 10:14am

When you put out 50Hz content with 25Hz (or 60Hz -> 30Hz) it will result in juddering images.

Believe it or not, it won't work.

And no, you cant "overclock" the chip and make it support different output modes, sorry.
Grüße,
Olove

"All we need to do ... is keep talking (Stephen Hawking)"

Ich leiste KEINEN Support per PN/E-Mail, derartige Anfragen werden nicht beantwortet.
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Jeroensky

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Wednesday, February 17th 2010, 5:49pm

Is it possible that DM8000 users can change chipset.
Remove the BCM7400, and place the BCM7404 or BCM7405 on the same place. So that we get 1080p 50/60 Hz.
(I haven't opened the DM8000, but if the processor is on a socket, then it could be a easy job right?

to

Homey

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Wednesday, February 17th 2010, 6:12pm

Quoted from "Jeroensky"

Is it possible that DM8000 users can change chipset.
Remove the BCM7400, and place the BCM7404 or BCM7405 on the same place. So that we get 1080p 50/60 Hz.
(I haven't opened the DM8000, but if the processor is on a socket, then it could be a easy job right?


Hmm no it's not a socked CPU. It's not a PC where you can easily replace / upgrade hardware components :-)
Also overclocking the CPU won't help ya :-)

BTW: Not even the BCM7405 can do it. Try it with a 7420

Quoted

1080i60 Deinterlacer for “Full HD” 1080p50/60 Video Output
• Supported on both HDMI and Component Outputs
Theorie ist, wenn man alles weiß, aber nichts funktioniert.
Praxis ist, wenn alles funktioniert aber niemand weiß warum.

Jeroensky

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Wednesday, February 17th 2010, 10:57pm

Well, ok.

I just realize: The maximum HD picture experience i ever receive was:
Interlaced : 1080i 50Hz (actually 25Hz right?)
Progressive : 720p 50Hz

So no worry. At the moment.
What do you people think, will they ever transmit in 1080p 50Hz? Or will it never happen or take many years? If so then we don't need to worry that we lose HD quality with our DM8000's.

Olove

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Thursday, February 18th 2010, 7:17am

No it won't be possible, the hardware simply isn't capable.
Furthermore you forgot to mention that 1080p24/30 is supported for media files.
Grüße,
Olove

"All we need to do ... is keep talking (Stephen Hawking)"

Ich leiste KEINEN Support per PN/E-Mail, derartige Anfragen werden nicht beantwortet.
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dubious

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Friday, February 26th 2010, 1:01am

I don't understand some of the answers here at all, myZentv HD on 9east broadcasts at 1920 x 1088 25p, with auto resolution my 8k outputs it at 1920 x 1080 25p and my Tv switches and tells me this is what it is. The picture displays perfectly with no judder !
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