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Old 25 August 2019, 21:20   #1
Borgy
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OSSC Smooth scrolling on Amigs

Hi folks

I wonder whether anyone has found a fix for this: I'm running my A1200 via OSSC onto an Led TV which looks stunning. However, when running side scrolling games (Turrican 2 for example) I get a noticeable scrolling 'stutter'. Same machine directly plugged into old LCD/monitors runs beautifully.
I'm using default OSSC settings under version 0.78a apart from having scanlines activated.

Is there a finer/detailed setting that could remedy?

Ta

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Old 25 August 2019, 21:23   #2
Retro-Nerd
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Enable the "Game" mode. This should disable any other digital processings for image enhancements. Every European LCD TV should be able to output 50Hz via HDMI.
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Old 25 August 2019, 21:25   #3
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Thanks. What menu setting is that under? Not spotted it anywhere.

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Old 25 August 2019, 21:27   #4
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Well, some TV maker calls it slighty different. What model exactly? You should check the manual.
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Old 25 August 2019, 22:21   #5
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Ah I see. Yeah I've played with TV settings and also checked another high end TV with game mode. Still the same issue.
I think this is something to do with the ossc signal conversion.

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Old 25 August 2019, 23:56   #6
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Quote:
Originally Posted by Borgy View Post
Ah I see. Yeah I've played with TV settings and also checked another high end TV with game mode. Still the same issue.
I think this is something to do with the ossc signal conversion.

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Sounds like the TV is converting to 60hz (i.e. 60 frames per second) whereas Amiga PAL natively is 50hz (i.e. 50 frames per second).

Can you not modify the refresh rate for 50hz?
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Old 26 August 2019, 01:19   #7
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Quote:
Originally Posted by Galahad/FLT View Post
Sounds like the TV is converting to 60hz (i.e. 60 frames per second) whereas Amiga PAL natively is 50hz (i.e. 50 frames per second).

Can you not modify the refresh rate for 50hz?
Yep, when my TV is refreshing at 50hz fed from my OSSC the output is incredibly smooth when scrolling (assuming the game/demo scrolls a fixed number of pixels per frame).
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Old 26 August 2019, 09:31   #8
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Do you have DVI or HDMI mode enabled in the OSSC? If DVI, the TV might be in some 60Hz only mode.
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Old 26 August 2019, 09:57   #9
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That is a very good point...hmmm...tv seems to say its at 50hz when Amiga switches resolution but maybe not. Not spotted a TV setting but will have another look.

Does anyone know any good 32 inch 50hz TVs that they'd recommend?

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Old 26 August 2019, 09:58   #10
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Ps: will also check whether ossc is in DVI mode or not

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Old 26 August 2019, 10:07   #11
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Any TV in the UK should do 50Hz - that's the standard rate of all TV broadcasts in Europe. There seems to be something funky going on somewhere. Is there another TV you could even try it with?
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Old 26 August 2019, 11:20   #12
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OSSC doesn't have a frame buffer so it cannot do frame rate conversion. Thus, the stutter must be caused by the TV. All TVs has to support 50 Hz through HDMI, however it is not mandatory that it has to be stutter-free. In my experience though, almost all TVs can provide a decent 50 Hz image is they are set up correctly. Put the TV into 'Game' mode if possible (helps with latency), alternatively a cinema or theater mode could work however they will usually have higher latency. Disable most/all video processing such as 'intelligent frame rate conversion' etc. Also, if it says 'dynamic' - disable it.
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Old 26 August 2019, 21:43   #13
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Borgy you probably want to update your OSSC firmware also. Its on 0.83a now.

Look under Firmware Update here for instructions:

http://junkerhq.net/xrgb/index.php?title=OSSC
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Old 27 August 2019, 09:19   #14
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0.83 you mean, and a for the firmware with audio support? Or is there an update to 0.83 called 0.83a? I can't find that one.
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Old 27 August 2019, 12:53   #15
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0.84 here
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Old 28 August 2019, 09:00   #16
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Beta still, correct? Is there a provisional changelog?
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Old 28 August 2019, 09:24   #17
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I don't believe this is beta, it's release 0.84. In open source projects, 1.00 is usually reserved for "feature completeness", but releases generally should have all the implemented features working.

For a log, see the repo: https://github.com/marqs85/ossc/commits/release
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Old 28 August 2019, 13:06   #18
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Officially it's still 0.83 according to the wiki and the file server https://www.niksula.hut.fi/~mhiienka/ossc/fw/
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Old 28 August 2019, 13:40   #19
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Ok, then it is not a proper release, just checked the tags and only 0.83 is tagged in the release branch as well. :-)
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Old 03 September 2019, 10:47   #20
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https://www.niksula.hut.fi/~mhiienka/ossc/fw/ 0.84 out

Firmware 0.84 released:

* Added 384x240 optimized mode
* Fixed audio infoframe content to comply with HDMI spec
* Improved 400p support
* Added default HDMI VIC compatibility option
* Remote hotkey and display improvements
Enabled quick loading of profiles 10+
Print profile quickload status
** Enabled sampling phase adjustment while in menus
* Added "Panasonic hack" for improving line count tolerance with line2x (certain Panasonic TVs only)
* HDMI AVI Infoframe VIC assigned for passthru modes (improved compatibility with Denon AVRs etc.)
* Added compatibility option for AV3 to use AV1 RGB and audio (enables Taito F3 AV1 connection with a small HW mod)
* Initconfig and profile versions made independent of fw version
* H. samplerate fine-tuning made more intuitive
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