ZMVs always going out-of-sync

NFITC1 · Post by **NFITC1** » Sat Feb 14, 2009 9:59 pm

I'm trying to make a TAS of Super Metroid. If you've played it before and/or seen videos of some of the time-saving tricks you'd know this requires split-second precision to pull them off. After about 5 or so minutes of gameplay (not sure how long it was) it always goes off sync. This isn't 5 minutes of me playing because I'm running it at 1/3 speed to see if I can do a no-damage TAS. I had pretty good success up to the Kraid fight, but then when I went to watch it in full speed it messed up in one place and I died. How do people who make TASs do it and successfully play it back? How can I prevent this happening in the future? I've been using movie saves a lot, but the part where it messed up I didn't have to save/load very often at all compared to other places that worked fine.

Deathlike2 · Post by **Deathlike2** » Sat Feb 14, 2009 10:07 pm

If you are using the "Pause Emu In Background" option, please uncheck that.

NFITC1 · Post by **NFITC1** » Sat Feb 14, 2009 10:22 pm

That option is not on.

This is what I have on:
Enable MMX Support
Disable Power Management
Use New GFX Engine
Enable IPS Auto Patching
Show ROM info on load
Log ROM Info

Toggled FFwd/Slowdown
Auto Frame Rate

On Movie State Load: Do not Switch Modes

I'm playing with a Joystick (the keyboard did this too)

Deathlike2 · Post by **Deathlike2** » Sat Feb 14, 2009 10:42 pm

I'm not sure what to tell you other than that some games are more likely to go out of sync than others in this process.

adventure_of_link · Post by **adventure_of_link** » Sun Feb 15, 2009 12:32 am

Maybe whoever made those SM speedruns used an older version of ZSNES?

NFITC1 · Post by **NFITC1** » Sun Feb 15, 2009 1:59 am

I don't know. I don't think any of the movies I made stay "in sync" if they get too long. I remember they worked fine for the MegaMan bosses. Maybe I should redo it in an older version. Do the older ZMVs play the same in this version?

creaothceann · Post by **creaothceann** » Sun Feb 15, 2009 2:07 am

NFITC1 wrote:How do people who make TASs do it and successfully play it back?

They still use SNES9x. See bluetoaster.net/emu and tasvideos.org.

Post by **grinvader** » Sun Feb 15, 2009 5:06 pm

To limit the amount of desyncs you experience with current versions of zsnes, please set the max frameskip to 0 and never use turbo.
That should help a bit, but isn't perfect. The core itself is not fully deterministic.

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ZMVs always going out-of-sync

ZMVs always going out-of-sync

Re: ZMVs always going out-of-sync