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flyinghead / flycast

Flycast is a multiplatform Sega Dreamcast, Naomi, Naomi 2 and Atomiswave emulator
GNU General Public License v2.0
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SC1 constant desyncs #736

Closed crowspaceboy closed 1 year ago

crowspaceboy commented 2 years ago

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Platform / OS / Hardware: Win 11

Github hash:

Hardware: flycast SC1 on fightcade

Description of the Issue

SC1 desyncs regularly, far more than any other game on fightcade, and continues to do so with multiple players even after both parties delete save states and redownload it from the server. most recent examples below are most extreme examples. in the past these desyncs often clear up after one desync, but for some reason with these particular players they happen consistently after one game, sometimes in the middle of the first game. happens with multiple players at least once, regularly, and it always seems to be -just- sc1. desync causes pause menu to come up briefly, then game eventually crashes.

Debugging Steps Tested made sure both players were picking same delay both players deleted save states and redownloaded from the server able to play one match before desync desyncs often happened after game 1, but at least a few times happened -during- game one

Logs Gathered


Please paste the contents of the log / logs here
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https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662527685460-9735 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662444196515-9926 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662443378785-9528 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662442765038-8012 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662442103943-9205 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662441896747-4793

Screenshots

(Replace this line with any issue screenshots)

crowspaceboy commented 2 years ago

https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662686240418-8328 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1662686766113-8449

Continues to happen with multiple players at random intervals. Here's two new replays with different players.

crowspaceboy commented 1 year ago

Issue persists. Here's some new examples with the most recent version of fightcade/flycast. https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1668744652412-4029 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1668744444073-5446 https://replay.fightcade.com/flycast/flycast_dc_soulclbr/1668744226825-7690

blueminder commented 1 year ago

While upstream Flycast and Flycast Dojo share much of the same code for netplay, the project you want that actually matches the version with Fightcade is here: https://github.com/blueminder/flycast-dojo

Apart from that, replay links alone are nearly useless for me. What is shown on the Fightcade replay servers are what is broadcast from player 1. What would help me better is having both players save offline replays so that I can compare between them.

It would also help to know the connection details of the players involved, as well as checking the version numbers of Flycast Dojo since some people on Fightcade play on slightly newer version if they go for preview releases. The netcode is largely the same, but if there is different behavior outside of that, it can affect desyncing.

vkedwardli commented 1 year ago

Besides the software version(GitHub hash), would be helpful if you can list the hardware used by both players also