NewHome › Forums › Koryuu Transcoder › Dreamcast S-video 480i alternating fields are wrong
megari.
I just recieved my Koryuu, which I bought for my dreamcast. I hooked up the DC through S-Video to the Koryuu, and then the output component cables are hooked up to a standard consumer CRT TV set.
The result are alternating fields, but they are synced up on even (or odd) rows. This results in the image looking both like 240p, and shimmers like 480i. I’ve tried many times to get a image with a camera, but no luck.
I did notice this note from the wiki:
“Interlace signal field reversal – Intermittently, the Koryuu will reverse the fields in an interlace signal (odd field will be switched with the even field).
This can cause compatibility issues with the OSSC or other undesirable effects on CRT displays. Usually, power cycling the unit or switching to a different input will cure the problem.”
This certainly sounds like what is going on, however the workaround suggested here is not working. I will turn off and on the koryuu, no luck. I also turn it off and unplug it for 10 seconds, and also no luck.
Any ideas?
It is something we’re looking into, you might need to power cycle Koryuu a number of times before it locks on correctly.
Though I’m curious as to why you would use a Koryuu on a Dreamcast when component video cables are available?
Though I’m curious as to why you would use a Koryuu on a Dreamcast when component video cables are available?
Only thing I can think of is a desire to play the handful of titles that don’t support RGB output (as in composite-/S-Video-only) without a patch. (That would also preclude use of HD Retrovision’s cables, which appear to require RGB.)
I am testing a version of the firmware that I’m hoping will help with various issues related to interlacing and transitions between interlaced and progressive modes. If you’re willing to give the test firmware a try, please feel free to send me a message!
A new test version of the Koryuu firmware was released this week. I would be very interested to learn if it has improved the NTSC field reversal problem. Would you be willing to try it?
NewHome › Forums › Koryuu Transcoder › Dreamcast S-video 480i alternating fields are wrong
megari.I just recieved my Koryuu, which I bought for my dreamcast. I hooked up the DC through S-Video to the Koryuu, and then the output component cables are hooked up to a standard consumer CRT TV set.
The result are alternating fields, but they are synced up on even (or odd) rows. This results in the image looking both like 240p, and shimmers like 480i. I’ve tried many times to get a image with a camera, but no luck.
I did notice this note from the wiki:
“Interlace signal field reversal – Intermittently, the Koryuu will reverse the fields in an interlace signal (odd field will be switched with the even field).
This can cause compatibility issues with the OSSC or other undesirable effects on CRT displays. Usually, power cycling the unit or switching to a different input will cure the problem.”
This certainly sounds like what is going on, however the workaround suggested here is not working. I will turn off and on the koryuu, no luck. I also turn it off and unplug it for 10 seconds, and also no luck.
Any ideas?
It is something we’re looking into, you might need to power cycle Koryuu a number of times before it locks on correctly.
Though I’m curious as to why you would use a Koryuu on a Dreamcast when component video cables are available?
Though I’m curious as to why you would use a Koryuu on a Dreamcast when component video cables are available?
Only thing I can think of is a desire to play the handful of titles that don’t support RGB output (as in composite-/S-Video-only) without a patch. (That would also preclude use of HD Retrovision’s cables, which appear to require RGB.)
I am testing a version of the firmware that I’m hoping will help with various issues related to interlacing and transitions between interlaced and progressive modes. If you’re willing to give the test firmware a try, please feel free to send me a message!
A new test version of the Koryuu firmware was released this week. I would be very interested to learn if it has improved the NTSC field reversal problem. Would you be willing to try it?
| Cookie | Duration | Description |
|---|---|---|
| _gat | 1 minute | This cookie is installed by Google Universal Analytics to restrain request rate and thus limit the collection of data on high traffic sites. |
| Cookie | Duration | Description |
|---|---|---|
| __gads | 1 year 24 days | The __gads cookie, set by Google, is stored under DoubleClick domain and tracks the number of times users see an advert, measures the success of the campaign and calculates its revenue. This cookie can only be read from the domain they are set on and will not track any data while browsing through other sites. |
| _ga | 2 years | The _ga cookie, installed by Google Analytics, calculates visitor, session and campaign data and also keeps track of site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognize unique visitors. |
| _gid | 1 day | Installed by Google Analytics, _gid cookie stores information on how visitors use a website, while also creating an analytics report of the website's performance. Some of the data that are collected include the number of visitors, their source, and the pages they visit anonymously. |
| Cookie | Duration | Description |
|---|---|---|
| IDE | 1 year 24 days | Google DoubleClick IDE cookies are used to store information about how the user uses the website to present them with relevant ads and according to the user profile. |
| test_cookie | 15 minutes | The test_cookie is set by doubleclick.net and is used to determine if the user's browser supports cookies. |
| Cookie | Duration | Description |
|---|---|---|
| ct_checked_emails | session | No description |
| ct_has_scrolled | session | No description |
| ct_mouse_moved | session | No description |
| ct_screen_info | session | No description |
| wordpress_apbct_antibot | session | No description |
| wp_woocommerce_session_9cc3598a6315be16da4f85bb374cf6a5 | 2 days | No description |
