OSSC (DIY video digitizer & scandoubler)

[RocketKnight]

I haven't had a single problem with any snes game so far. I have a 1chip-01. Are there problematic games or something or are people seeing problems on all games?

It's not about the console or the games but the display. Some don't have any issues, some do. It's got to do with the SNES' uncommon sync signal which, as far as I remember, has been altered to reduce the shifting effect in composite video.

[Nrg]

Any idea why OSSC shows C64 video signal as 50.27 Hz, when it is "known" to be around 50.12 Hz? Also other scalers show it as 50.12 Hz ..

[marqs]

Any idea why OSSC shows C64 video signal as 50.27 Hz, when it is "known" to be around 50.12 Hz? Also other scalers show it as 50.12 Hz ..

Displayed refresh rate is calculated using scanline count reading from TVP7002 which is off by one line with some systems. You can easily check if this is the case by comparing it to LO value (which is read from FPGA) shown in the info screen. PAL C64 should show LO=624 (=2*312) in linedouble mode, so if main display shows 311p@50.27Hz, then real refresh rate is (311/312)*50.27 =~ 50.11Hz. Maybe it'd worth changing the calculation to use FPGA-provided value, even though the issue is only cosmetic and does not affect functionality.

[Nrg]

Any idea why OSSC shows C64 video signal as 50.27 Hz, when it is "known" to be around 50.12 Hz? Also other scalers show it as 50.12 Hz ..

Displayed refresh rate is calculated using scanline count reading from TVP7002 which is off by one line with some systems. You can easily check if this is the case by comparing it to LO value (which is read from FPGA) shown in the info screen. PAL C64 should show LO=624 (=2*312) in linedouble mode, so if main display shows 311p@50.27Hz, then real refresh rate is (311/312)*50.27 =~ 50.11Hz. Maybe it'd worth changing the calculation to use FPGA-provided value, even though the issue is only cosmetic and does not affect functionality.

Makes sense. And yes, indeed, OSSC shows LO=624. Thanks for the explanation!

[Ona]

Can somebody help me and tell me how to connect a Elgato capture card between the OSSC and a tv? i want to play on "tube monitor" or "tft monitor" and be able to capture the gameplay with the elgato.
i dont know what to do once i take the dvi or hdmi output from the OSSC.

[eric90000]

Can somebody help me and tell me how to connect a Elgato capture card between the OSSC and a tv? i want to play on "tube monitor" or "tft monitor" and be able to capture the gameplay with the elgato.
i dont know what to do once i take the dvi or hdmi output from the OSSC.

It sounds like you just need to split the signal from the OSSC? Any basic powered HDMI splitter should be fine. So it'd be OSSC > DVI - HDMI Cable > HDMI Splitter Box > Output 1 > TV / Output 2 > Elgato Capture Card.

[Fudoh]

The Elgato boxes all have a HDMI passthrough output, so you don't need a splitter.

[Blair]

Can somebody help me and tell me how to connect a Elgato capture card between the OSSC and a tv? i want to play on "tube monitor" or "tft monitor" and be able to capture the gameplay with the elgato.
i dont know what to do once i take the dvi or hdmi output from the OSSC.

what model of "tube" monitor are you going to play on? (what games?) because if you're going to be using analog video formats then you'll need a video splitter outputting your signal to the TV and the OSSC+Elgato capture card.

[Ona]

Hello everyone!

Thanks for all the replys!

It's a pretty old TV with 50Hz and 60Hz slot (SCART).

I guess i found a solution to connect everything correct with just a few more cables!

I found this link... http://www.spielgruft.de/videos/2016/ossc-elgato/

The dude made the guide a while ago, he now wants to record with the OSSC in between as well.

The guide looks preety solid! Any complaints from you guys?

Cheers!

[blizzz]

That guide won't work, like at all. First of all he tries to split DVI-D into YPbPr with passive splitters, then he tries to use Y as composite video.

You will need either a) a powered RGB SCART splitter and split the signal before it reaches the OSSC to use a CRT, or b) just use the HDMI out of your Elgato to an LCD monitor. I assume the Elgato can record HDMI video with analog audio, but does it also output HDMI + Audio from the passthrough port in that case?

[Ona]

hrmmm... problem is that you have to get the sound integrated into the Elgato... from OSSC to Elgato...

[kardus]

Are there any files/plans for the OSSC acrylic case anywhere? I want to get one cut locally as mine snapped.

[ZellSF]

My NESRGB isn't behaving with OSSC:
https://www.youtube.com/watch?v=ZHMjKAlkJpU
See how the very top of the screen is moving. Any ideas? I tried all sync settings and none of them do anything. Weirdly enough, 256x240 optimized mode minimizes the effect:
https://www.youtube.com/watch?v=Av6IAM4B9LE
(sorry for terrible captures, but you should be able to get the point).

[marqs]

hrmmm... problem is that you have to get the sound integrated into the Elgato... from OSSC to Elgato...

Why is that? Does it work only with some propiertary SW that doesn't allow using analog line-in of soundcard?

Are there any files/plans for the OSSC acrylic case anywhere? I want to get one cut locally as mine snapped.

You can PM me if you're interested in design files for acrylic case. Just note that they are made for 384mm x 384mm sheets (makes up materials for 5 boards) so you'll need to tweak them a bit if you want to use smaller sheets.

My NESRGB isn't behaving with OSSC:
https://www.youtube.com/watch?v=ZHMjKAlkJpU
See how the very top of the screen is moving. Any ideas? I tried all sync settings and none of them do anything. Weirdly enough, 256x240 optimized mode minimizes the effect:
https://www.youtube.com/watch?v=Av6IAM4B9LE
(sorry for terrible captures, but you should be able to get the point).

This could be related to the position where NES uses the dirty short scanline trick. Whereas SNES outputs that just after the 240 rendering lines, NES apparently outputs that just before the 1st rendering line (not sure where the 16 'border' scanlines are located within those 240 lines, though). That glitch results to jitter in digitizer PLL which gets stabilized during the next couple scanlines that are hidden in blanking area with SNES but seemingly not with NES. I wonder if other NESRGB owners have the same issue?

[paulb_nl]

My NESRGB isn't behaving with OSSC:
https://www.youtube.com/watch?v=ZHMjKAlkJpU
See how the very top of the screen is moving. Any ideas? I tried all sync settings and none of them do anything. Weirdly enough, 256x240 optimized mode minimizes the effect:
https://www.youtube.com/watch?v=Av6IAM4B9LE
(sorry for terrible captures, but you should be able to get the point).

Even the Hi-def NES has this issue: https://youtu.be/kEsdtj7YHQI?t=1m25s You can also see it on other NESRGB videos with the XRGB mini.

[ZellSF]

My NESRGB isn't behaving with OSSC:
https://www.youtube.com/watch?v=ZHMjKAlkJpU
See how the very top of the screen is moving. Any ideas? I tried all sync settings and none of them do anything. Weirdly enough, 256x240 optimized mode minimizes the effect:
https://www.youtube.com/watch?v=Av6IAM4B9LE
(sorry for terrible captures, but you should be able to get the point).

Even the Hi-def NES has this issue: https://youtu.be/kEsdtj7YHQI?t=1m25s You can also see it on other NESRGB videos with the XRGB mini.

Well that's what the OSSC does in 256x240 optimized mode, but for some reason in line2x or line3x it seems to amplify the effect over several lines more

[Ona]

That guide won't work, like at all. First of all he tries to split DVI-D into YPbPr with passive splitters, then he tries to use Y as composite video.

You will need either a) a powered RGB SCART splitter and split the signal before it reaches the OSSC to use a CRT, or b) just use the HDMI out of your Elgato to an LCD monitor. I assume the Elgato can record HDMI video with analog audio, but does it also output HDMI + Audio from the passthrough port in that case?

i informed that dude and told him to check his plan because it wouldn't work. he double check it and told me that elagto is kind of confusing because it has an option to use the elgato a/v adapter for RGB input. http://files.elgato.com/supportimages/g ... posite.jpg
but he isn't sure if the green and blue cinch are still working while useing the "composite video input" option of the elgato software.

elgato has hdmi + audio output as well as a usb output. but to get video and audio output from the elgato you first have to make the input with video + audio and thats where the OSSC sucks... the DVI output from the OSSC doesn't have integrated audio output... means, you have to find a way to integrate the audio from the OSSC Jack output into the hdmi input(or A/V input) of the elgato(or any other capture card)... it's just a mess...

hrmmm... problem is that you have to get the sound integrated into the Elgato... from OSSC to Elgato...

Why is that? Does it work only with some propiertary SW that doesn't allow using analog line-in of soundcard?

if you want to capture the video + audio with elgato, you have to make sure that elgato gets both as input... there is no way around. you just have a hdmi or a/v input. ossc has only dvi output (without integarted audio). you can put the audio in output from the OSSC into some speakers, headphones or a soundcard, but elgato won't capture it with your gameplay.

[ZellSF]

You could just record audio separately and mix it in while editing, shouldn't be too much work to line up the audio exactly.

Otherwise you need a HDMI audio integrator, no amount of passive adapters will work. I don't think anyone's found a good cheap one yet though.

[blizzz]

if you want to capture the video + audio with elgato, you have to make sure that elgato gets both as input... there is no way around. you just have a hdmi or a/v input. ossc has only dvi output (without integarted audio). you can put the audio in output from the OSSC into some speakers, headphones or a soundcard, but elgato won't capture it with your gameplay.

If you have an original Elgato Game Capture HD you can select HDMI + analog audio. Same as with most other capture cards.


If your capture card only has an HDMI input and no analog audio then you'll have to do what ZellSF said and use another sound card (for example the on-board one of your PC or notebook) to record the audio seperately and merge it later.

The analog input dongle for the Elgato has inputs for YPbPr (component) and not RGB. In fact it doesn't even have enough inputs for RGB, since you would need a fourth RCA connector for the sync signal. There's really nothing confusing about it, that guy just doesn't know the basics of analog and digital video.

[Ona]

if you want to capture the video + audio with elgato, you have to make sure that elgato gets both as input... there is no way around. you just have a hdmi or a/v input. ossc has only dvi output (without integarted audio). you can put the audio in output from the OSSC into some speakers, headphones or a soundcard, but elgato won't capture it with your gameplay.

If you have an original Elgato Game Capture HD you can select HDMI + analog audio. Same as with most other capture cards.


If your capture card only has an HDMI input and no analog audio then you'll have to do what ZellSF said and use another sound card (for example the on-board one of your PC or notebook) to record the audio seperately and merge it later.

The analog input dongle for the Elgato has inputs for YPbPr (component) and not RGB. In fact it doesn't even have enough inputs for RGB, since you would need a fourth RCA connector for the sync signal. There's really nothing confusing about it, that guy just doesn't know the basics of analog and digital video.

I own the original Elgato Game Capture HD! So all I have to do is hook up the hdmi into the elgato, activate "Analog Audio" and put the audio into the "analog input dongle" red/white cinch?

Quote:
5) Your may be using HDMI video with Analog Audio cables, but the "Analog Audio" setting is turned off.

Solution: If you are using an Xbox 360 with an HDMI cable, and red and white Analog Audio cables, make sure the "Analog Audio" setting is not turned off:

Endquote.

I guess i will give the guy some info since he is a very nice dude. and i think it wasn't his fault although his solution wouldn't work either. i just wasn't clear enough to him. my problem is that i want to record games with lightguns, but lighguns only work on old tv's. thats why i need a solution to get rgb signal from the ossc to my tv but still be able to record with the elgato (video+audio).

[blizzz]

You could probably add an adapter like this to the input of the OSSC and connect composite to your CRT, assuming your RGB cables use sync-on-composite (and not clean/composite sync or sync on luma).

The other option for lightguns is to use a power RGB SCART splitter.

[bonzo.bits]

Is anyone else going the DIY barebones kit route? I need some help finding a T6-13B, I believe it is a SCART input connector...The only website I've found to order from has a minimum order requirement of 5000 units.

[Ona]

You could probably add an adapter like this to the input of the OSSC and connect composite to your CRT, assuming your RGB cables use sync-on-composite (and not clean/composite sync or sync on luma).

The other option for lightguns is to use a power RGB SCART splitter.

Already own one of this adapters and it sounds like a good plan!

But just to make sure, please answer my previous question about the analog audio input. Thanks for the help Blizzz! <3

[marqs]

Is anyone else going the DIY barebones kit route? I need some help finding a T6-13B, I believe it is a SCART input connector...The only website I've found to order from has a minimum order requirement of 5000 units.

I updated BOM just a while ago with a replacement (CS-107) which is easier available e.g. from Ebay or Aliexpress.

You could probably add an adapter like this to the input of the OSSC and connect composite to your CRT, assuming your RGB cables use sync-on-composite (and not clean/composite sync or sync on luma).

The other option for lightguns is to use a power RGB SCART splitter.

Using a passive splitter changes termination properties so it can degrade composite video picture quality on your CRT and reduce SNR of sync signal. Probably not an issue unless you plan on using very long cables, but still something to keep in mind.

[blizzz]

But just to make sure, please answer my previous question about the analog audio input.

You mean about analog audio on the Elgato? I thought you answered that yourself. Yes, just connect the audio from the OSSC to the analog dongle of the Elgato and select "HDMI with Analog Audio" in the capture software. If you connect the audio to both the Elgato and your TV with a passive splitter the volume will suffer and there might be more noise.

Same with the composite video, but this is only used as sync in the OSSC. So as long as the OSSC can still sync it shouldn't affect the picture quality on the recording, just on your CRT. If you want a cleaner solution you'll need a powered SCART splitter.

I also found out something interesting while testing this setup. The Elgato HD will add analog audio to the HDMI pass-through when you've connected it to a PC and select the "with Analog Audio" option. But sadly you have to connect it to a PC, when you use a USB port on your TV it will switch back to HDMI audio.

[Ona]

But just to make sure, please answer my previous question about the analog audio input.

You mean about analog audio on the Elgato? I thought you answered that yourself. Yes, just connect the audio from the OSSC to the analog dongle of the Elgato and select "HDMI with Analog Audio" in the capture software. If you connect the audio to both the Elgato and your TV with a passive splitter the volume will suffer and there might be more noise.

Same with the composite video, but this is only used as sync in the OSSC. So as long as the OSSC can still sync it shouldn't affect the picture quality on the recording, just on your CRT. If you want a cleaner solution you'll need a powered SCART splitter.

I also found out something interesting while testing this setup. The Elgato HD will add analog audio to the HDMI pass-through when you've connected it to a PC and select the "with Analog Audio" option. But sadly you have to connect it to a PC, when you use a USB port on your TV it will switch back to HDMI audio.

yeah i did but i just wanted to be 110% sure
can you recommand a good powered scart splitter?

You could probably add an adapter like this to the input of the OSSC and connect composite to your CRT, assuming your RGB cables use sync-on-composite (and not clean/composite sync or sync on luma).

The other option for lightguns is to use a power RGB SCART splitter.

Using a passive splitter changes termination properties so it can degrade composite video picture quality on your CRT and reduce SNR of sync signal. Probably not an issue unless you plan on using very long cables, but still something to keep in mind.

i guess i have to test it...

[RocketBelt]

Does anyone know how a dvp-1000 would pair up with the OSSC?
From fudoh's page it suggests that the 480p upscaling is sharp and clean, and adds around a frame of processing.
Would it be a good match?

[Fudoh]

Definitely not worth it. Today's TVs are so good in terms of scaling that you you would have to have a real shitty one to make the Faroudja worth it. Also nobody has tested the Faroudja's compatibility with the OSSC's 720p output.

[marqs]

Uploaded fw. 0.73 which has only minor changes:
* Fixed adv. timing tweaker using previous values when updating parameters
* Added "hsync tolerance" option to allow detection of some Neo-Geo models (needs to be adjusted to >9.5us with H-PLL coasts of 3)

[bonzo.bits]

I updated BOM just a while ago with a replacement (CS-107) which is easier available e.g. from Ebay or Aliexpress

Thanks!