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Author Topic: 200% speed on interlaced video  (Read 1325 times)

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Osirus23

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200% speed on interlaced video
« on: August 03, 2021, 07:56:17 pm »
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« Last Edit: August 23, 2021, 01:29:18 pm by Osirus23 »

Calamity

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Re: 200% speed on interlaced video
« Reply #1 on: August 04, 2021, 01:58:03 pm »
I had the problem with a rolling image when running Pacman rotated on a horizontal tv, so I switched the monitor type from arcade_15 to ntsc. Now switchres runs Pacman at 2560x480i to fit it on a horizontal screen. There is no rolling, but the game now runs at 200% speed. If I use -norotate and run it like I would on a vertical monitor it uses 2560x240 and runs at normal speed, so it appears to be an issue using interlaced video. Is there a way around this?

Hi Osirus32, I'm moving this to a separate thread.
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Calamity

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Re: 200% speed on interlaced video
« Reply #2 on: August 04, 2021, 01:59:37 pm »
Please post a log of pacman when it runs at 200%, I need to check your settings.
Important note: posts reporting GM issues without a log will be IGNORED.
Steps to create a log:
 - From command line, run: groovymame.exe -v romname >romname.txt
 - Attach resulting romname.txt file to your post, instead or pasting it.

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Osirus23

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Re: 200% speed on interlaced video
« Reply #3 on: August 04, 2021, 07:30:17 pm »
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« Last Edit: August 23, 2021, 01:29:08 pm by Osirus23 »

Calamity

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Re: 200% speed on interlaced video
« Reply #4 on: August 05, 2021, 07:52:42 am »
Ok this looks like a genuine problem, I'll need to check it here. By now, I think you can circunvent the problem by setting frame delay above 0, you can set it from the ui.
Important note: posts reporting GM issues without a log will be IGNORED.
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 - Attach resulting romname.txt file to your post, instead or pasting it.

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Osirus23

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Re: 200% speed on interlaced video
« Reply #5 on: August 05, 2021, 10:05:50 pm »
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« Last Edit: August 23, 2021, 01:28:54 pm by Osirus23 »

schmerzkaufen

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Re: 200% speed on interlaced video
« Reply #6 on: August 06, 2021, 01:54:28 am »
Sounds like what I experience with a few games, like Xexex, until I turn frame_delay on the game runs like about 200% indeed.

Dunno if related but it could maybe: after you've just set vsync_offset for a game, then go back to the menu and select a different game; the previously set offset value is carried over, like it stuck to the slider and remains until you reset it or set a new value.

Specific ini files experienced a similar issue until 203 where it wasz fixed after I reported it.

These are problems I've mentioned not long ago, and BTW I also experience random crashes on games launch from time to time, maybe it is related.

PS: if you always use command line instead of the UI it is possible you don't experience such issues.
GravyMOM LCD user, Ryzen 5600X, RX Vega 56 OC, W10