Hdmi to usb 2/3

On 05/06/15 21:34, John Stefanidis wrote:

I mean how hard could it be?

Extremely. And the fact you had to ask suggests you're not in possession

of anywhere near enough facts to tackle this. Also, you're apparently

not in possession of sufficient facts to post in the right place,

because this forum is for support on the Eagle PCB design tool, not what

you're after.

Yup i noticed that but I was hoping that a mod would be kind enough to move the post to the right place...

It’s not really my fault (especially if you consider that i am a brand new user) the site is a little misleading... I just clicked on Resources>Ask a question... well one would assume that by clicking the "ask a question" option he would be transferred to a specific dialog for asking a question or to a specific sub forum for asking general questions... instead I was linked here Experts were there in the center there were general questions by users there were buttons to browse questions answer questions and earn points but none for actually asking a question (the thing that most people would do if clicking on an option labeled as "ask a question") and on the right there it was "ask the expert" and that’s why i think its misleading the user has to know that there is no way to ask a question directly in this page he has to know what EAGLE is and by clicking "ask the expert" he can only ask about that...and he also has to know that in order to ask a general question he shouldn’t bother porting in this link since he just should pick a forum from the list and open a regular topic to ask his/her question (as it traditionally happens in all forums... ) but then again why having the option "ask a question" under resources beats me...

Yes I know there is a list on the right column of the page but i realized that after posting and noticing my post being in a wrong place (so I gone back to see what went wrong) and its kind of counter intuitive to put this list with no bold labeling or something and on top of that under a big button that is labeled "ask the expert"

Also if you could elaborate as to why its extremely hard I would appreciate it.

Working with video signals is incredibly hard. In Ben Hecks recent LCD hack video he goes through the steps for working with one video standard, but HDMI is a lot more complex and would be even harder to work with, and with the challenge of USB connectivity it would not be worth the effort. The best thing I can suggest is a HDMI capture card like this:PCI-E HDMI Input Video Capture Card Grabber 1080P 30HZ F Windows Win8 Blu-Ray WT | eBay or this:http://www.maplin.co.uk/p/elgato-game-capture-hd-a34nf?gclid=CLbujpDN-cUCFWKWtAodMw0AUw

It’s not really my fault (especially if you consider that i am a brand

new user) the site is a little misleading... I just clicked on

Resources>Ask a question... well one would assume that by clicking the

"ask a question" option he would be transferred to a specific dialog for

asking a question or to a specific sub forum for asking general

questions... instead I was linked here  were there in the center there

were general questions by users there were buttons to browse questions

answer questions and earn points but none for actually asking a question

(the thing that most people would do if clicking on an option labeled as

"ask a question") and on the right there it was "ask the expert" and

that’s why i think its misleading the user has to know that there is no

way to ask a question directly in this page he has to know what EAGLE is

and by clicking "ask the expert" he can only ask about that...and he

also has to know that in order to ask a general question he shouldn’t

bother porting in this link since he just should pick a forum from the

list and open a regular topic to ask his/her question (as it

traditionally happens in all forums... ) but then again why having the

option "ask a question" under resources beats me...

Hi John,

Many of the regulars in the EAGLE forums are tired of getting questions

unrelated to EAGLE. It happens a lot, and you're right it's not your

fault. E-14's site can be confusing just because of the shear volume of

data it contains and some of it's design decisions are "questionable".

So don't sweat it, it's just getting a little ridiculous in here.

 

Also if you could elaborate as to why its extremely hard I would

appreciate it.

I have very little experience with HDMI, but I have a strong idea of how

USB works and why this would be difficult on that end of the interface.

You see USB is apparently plug and play, TO YOU. A big part of the

success of USB is that it has thrown all of the hard work on the

developer's plate leaving the end user with a plug and play experience

in which he/she doesn't have to worry about descriptors, device classes,

differential signaling, etc.

Just getting data over USB requires the use of a USB stack, which

usually runs several thousand lines of code. There are existing stacks,

but you would likely have to port them. Additionally you would now need

a microcontroller to run the stack on and you would have to design

suitable hardware for it. I think you're starting to see the picture,

and this is just the tip of the iceberg. I have said nothing about how

the HDMI signal would need to be processed in order to send it over the

complex USB protocol.

hth,

Jorge Garcia

Cadsoft Support

Well thanks Samuel but I now got stuborn on making a device that would

take feed from hdmi and push it through usb acting as a web came

I mean what is it with you guyz I already decided to make trials and

errors study resources etc and generally invest time into this and you

point me either to not do it or to buy something that could do the same

job with what I have in mind to make...

Its like joining a painting forum asking for advice on how to begin

practice painting in order to at some point in the future being able to

paint a portrait of me and the forum responding to me "you never do it"

or "go to a photographer and take a picture"

I would just like some guidelines and resources if available on how to

get started like to establish the frist set of what i need to know and

in a very general abstract way it should be made...(like parts that

would be needed for sure )

thats all I ask...

And yes i still insist it wont be that hard (but I think you

misunderstood me by not being "that hard" i didnt mean that it would be

a plug and play brainless thing like making a lego house out of lego

pieces.... I know that I probably have to study weeks if not months and

have to burn some parts and generally do some trials and errors but im

willing and prepared for that :D  Also I may be a "noob" in electronics

but I know the physics and mathematical part of them very well I know

coding so I have a sort of relative background to start and trying this

thing and see were it will get me.. its not like im a 50's grandmah that

wants to make a sophisticated robot with AI )

And i still cant see why this could be that hard (on the contextx i

provided above) since there are such thing everywere around us like

webcams for example they take the signal out of a ccd  and push it

through usb then why not instead of a ccd sensor having a flash memory

instead ? then the "only" thing thats needed is to "feed" that flash

memory with date gotten from the HDMI input... so with an FPGA to do

that work a flash memory chip a usb shield and some code it somehow

should work now the only think i need to know is more about the

theory like what exactly to code in the fpga so please provide me with

resources and stuff like that relative to my goal

Thank you

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Well thanks Samuel but I now got stubborn on making a device that would take feed from hdmi and push it through usb acting as a web came

I mean what is it with you guys I already decided to make trials and errors study resources etc and generally invest time into this and you point me either to not do it or to buy something that could do the same job with what I have in mind to make...

It’s like joining a painting forum asking for advice on how to begin practice painting in order to at some point in the future being able to paint a portrait of me and the forum responding to me "you never do it" or "go to a photographer and take a picture"

I would just like some guidelines and resources if available on how to get started like to establish the first set of what i need to know and in a very general abstract way it should be made...(like parts that would be needed for sure )

That’s all I ask...

And yes i still insist it won’t be that hard (but I think you misunderstood me by not being "that hard" i didn’t mean that it would be a plug and play brainless thing like making a lego house out of lego pieces.... I know that I probably have to study weeks if not months and have to burn some parts and generally do some trials and errors but I’m willing and prepared for that   Also I may be a "noob" in electronics but I know the physics and mathematical part of them very well I know coding so I have a sort of relative background to start and trying this thing and see where it will get me.. It’s not like I’m a 50's grandma that wants to make a sophisticated robot with AI )

And i still can’t see why this could be that hard (on the context i provided above) since there are such things everywhere around us like webcams for example they take the signal out of a ccd  and push it through usb then why not instead of a ccd sensor having a flash memory instead ?(I have seen in the past a dyi laser mouse and webcam so its essentially the same thing but instead of pluging a sensor ill need to plug a memory chip ... or not? )  then the "only" thing that’s needed is to "feed" that flash memory with data gotten from the HDMI input... so with an FPGA to do that work a flash memory chip a usb shield and some code it somehow should work now the only thing i need to know is more about the theory like what exactly to code in the fpga so please provide me with resources and stuff like that relative to my goal

Thank you

well its funny i deleted the post you quoted in order to fix some typos (couldnt edit it for some reason the text box insisted on being blank ) and resent the fixed version of that post, and now your reply to that said post is above the post your replied anyway my bad

Your link doesnt work though maybe you could look into it ? thank you (I hope its a diagram or a pdf or something )

On 06/06/15 11:23, John Stefanidis wrote:

And yes i still insist it wont be that hard (but I think you

misunderstood me by not being "that hard" i didnt mean that it would be

a plug and play brainless thing like making a lego house out of lego

pieces.... I know that I probably have to study weeks if not months and

have to burn some parts and generally do some trials and errors but im

willing and prepared for that

No, what I meant was that it's actually VERY HARD. HDMI is a live,

real-time video stream, like what used to be broadcast in the days of

analogue TV, except that it's multi-component and digital. USB is a

serial data protocol with MANY layers of complexity. Jorge has already

pointed out how complex that is, but it's actually the easy part. Even

if you've got your full USB stack, including the (not very well

documented) webcam protocol layer, you don't have anything to present

until you've implemented a frame grabber. Look up the prices of video

capture cards for PCs (not Freeview decoders, they're much easier) to

get an idea how hard that is.

I agree. Hdmi is hard. For a first project you need to try and do something a lot more simple. HDMI is beyond the realm of the vast majority of electronics hobbyists. If you eventually do get to the stage where you are able to confidently handle HDMI, you are looking at years, not months of work. Electrical engineering is a great hobby, but as with any hobby you can't just jump in at the deep end. Start with basic arduino and 555 projects and gradually expand your knowledge. Also if it was my link that was broken it was just to a HDMI capture card. You can easily find one with google.

On 05.06.2015 22:34, John Stefanidis wrote:

Well i am fairly new in electronics so forgive me if my question is too

stupid to be explained...

 

I have a new compact nikon digital camera with hdmi out the camera is

capable to feed my tv with my footage in real time...Yet i cant find a

way to use it as a webcam (which I find strange since it also has an usb

out ) Also I didnt find a way to make it work as webcam (without

spending 700$ or more that is... ) and I cant explain that to myself ...

the camera is capable to output a 1080p@60fps signal to my television in

real time yet my much more sophisticated PC cant make any use of it to

simply skype with or what not... So I decided to start a project

prototyping a board that has a hdmi in and replicates that signal to a

usb 2.0 or 3.0(if its needed to maintain the cameras full hd resolution)

and for that I would like you to give me some guidelines and resources

to read and master them in order to achieve my goal...

 

I mean how hard could it be?  there is no conversion digital signal will

come in and out it will be the same signal no compression would be

necessary (since its already compressed inside the camera and since it

works fine just "plug and play" like when pluging the cameras hdmi out

to my tv) so what I think with my total unexpirienced mind is that I

just need to copy the signal into the usb protocol in order for windows

to see the protype board as a windows recording device and just play the

feed (and thus me being able to use my camera for online

streaming/chatting like for example skype)

Before you start building the project, have a look at sparkocam sw and

see if it can do what you want over the existing usb. It supports nikon

cameras.

If not, there are existing hdmi frame grabbers, look at

http://www.epiphan.com or even ebay.

Its not as straight forward as you think, but with a FPGA and some

"smop" you should be set.