Regression : FMV cutscene stutter and perfomance are worse than older version

[zminhquanz]

I have a tablet using Mali and PowerVR , both tablet I'm tested in newer build and it doesn't fixed , perfomance ingame and FMV cutscene are worse than older version , these picture below are same setting config
Game tested : Patapon 3 , Star Ocean , P3P , The 3rd Birthday

In 1.3.0.1 and newer build , is stutter and worse perfomance

In 1.2.2 and older , is better and stable

[hrydgard]

Thanks for reporting, that's quite unexpected..

More specifically, what devices are these?

[DonelBueno]

Is texture scaling enabled? Maybe it's the same issue as #9125

[hrydgard]

Good thought, could very well be. I plan to look into that one soon.

[zminhquanz]

@DonelBueno no , they aren't , i'm not prefer to turn on texture upscaling on mobile

[zminhquanz]

@hrydgard i have both old tablet is using Rockchip ( Mali-400) and Mediatek (PowerVR SGX 544)

[hrydgard]

I now believe this is indeed related to #9125 even if no scaling is enabled. Will investigate soon.

[unknownbrackets]

I'm not sure if this has a shared cause - the biggest difference is we'd be checking the alpha on the entire video texture on more frames. I hope that's not enough to lose 30% of performance.

Maybe it's the validation of the frame packets? Can you identify which build first had worse performance, and which build most recently was still fine? As narrow a range as possible, from the builds on the buildbot, please.

-[Unknown]

[zminhquanz]

@unknownbrackets i'm mention this above , using version 1.2.1 , FMV FPS and performance are good 100% , switch to 1.3.1 , it's drop FPS

[unknownbrackets]

Which git build specifically started this problem? There are about 1000 changes between v1.2.1 and v1.3. If you tried 8 builds you'd narrow that down to less than 5 changes, which might make the bug easy to find.

-[Unknown]

[zminhquanz]

oh , i don't know because between 1.2.1 to 1.3.1 , i'm busy and don't have to test this build

[zminhquanz]

ok , i will try to find git build in 1.2.1 version have to this issues

[hrydgard]

That's https://github.com/hrydgard/ppsspp/commits/51bcb02 but that can't be the one, got to be a nearby one.

[hrydgard]

http://buildbot.orphis.net/ppsspp/index.php?m=fulllist

Right before is the merge of the IR interpreter #8725, after is 1f28d80 which does not seem relevant...

Pretty odd.

[zminhquanz]

wait a minute , it's start to slowest down on git geac1848 #8867 ( v1.2.2-821-geac1848 )
@hrydgard yeah , exactly , older build than 821 it's better and isn't slow down , so #8725 which does not seem relevant

[zminhquanz]

@hrydgard Newer build git than 821 #8867 , it's slow down it's doesn't fixed in #9447

[unknownbrackets]

Just to be sure: you don't have the rewind feature enabled, right?

-[Unknown]

[zminhquanz]

@unknownbrackets nope , i started game normally , no load save state

[unknownbrackets]

Okay, I'm reproducing. It almost seems like ffmpeg may not be using threads now, or something is different about what happens in it. Must be an init problem - was caused by 558b462.

It definitely looks like ffmpeg is using threads to decode before, and is not using threads to decode now. Skipping SetupStreams() makes it use threads again, so something about avformat_find_stream_info is enabling threads that isn't happening in SetupStreams().

-[Unknown]

[zminhquanz]

Yeah , i see , i was find out the git build to easy to find problem

[zminhquanz]

@unknownbrackets test again new build , it's temporary fixed

[hrydgard]

temporary?

[zminhquanz]

I mean it's fixed for me , what about of the others ?

[hrydgard]

Well, it's obviously fixed for Unknown as well. I will try it soon also, but I'm closing. Let's reopen if anyone still see slowdowns.