Some my emulators are slow / glitchy audio

LektroiD

Hi everyone,

I'm totally new to Raspberry Pi, It was bought as a replacement for my hardware C64 & Amiga 1200, having all the other emulators is a massive bonus. A huge thanks to YouTube's Retro Recipes for the heads up about this awesome machine.

The issue I'm having when using some of the emulators is slow response and scratchy audio. The issue appears to be emulator specific, not game specific.

Working emulators:
Atari 2600
NES
SNES
GBA
Sega Master System
Sega Megadrive / Genesis
Playstation

Slow / Glitchy emulators:
Atari 7800
C64
Vectrex

I've not set up the Amiga just yet, I want to solve the above issues first. I think once I know what the problem is with one, the rest should be easy to deal with (I'm hoping so anyway).

As mentioned, I'm new to Raspberry Pi / Retropie. I'm running a standard install, so I'm not really sure if I need to change any config files, they open into Sublime Text (MacOS) ok via the network, but can't seem to see many options in any of the config files, and to be honest I wouldn't know what to enter to improve the system anyway, even after looking through all the documentation.

I've searched through the posts, but can't find anything which answers my questions.

I've added my setup to my signature, if it doesn't show I'll edit this with the necessary info.

dankcushions

@lektroid please provide a verbose log for an emulator in question: https://retropie.org.uk/docs/Runcommand/#launch-with-verbose-logging

LektroiD

@dankcushions said in Some my emulators are slow / glitchy audio:

@lektroid please provide a verbose log for an emulator in question: https://retropie.org.uk/docs/Runcommand/#launch-with-verbose-logging

Hi, thanks for offering your help on this matter, it is very much appreciated.

After much frustration with the instructions in the link which may as well have been written in Greek, I have managed to find my way into verbose logging by choosing a game, pressing 'A' on the controller at launch, then selecting option 'L - Launch With Verbose Logging". However, the runcommand.log file does not appear to exist anywhere. When I go into the system via the network, it only shows up 4 folders ( bios, configs, roms, splashscreens). If I plug the card into my computer (MacOS), it shows a list of files, and only one folder (overlays). There is certainly no path named "/dev/shm/runcommand.log" as suggested in the docs. How do I find that?

Please explain this in plain English, as I am totally new to this.

dankcushions

@lektroid
if you look at the SD card via mac/windows you will likely only see the /boot/ partition, which is not relevant here.

via samba ("network") you only see the samba shares, which do not include this path.

you can locate the /dev/shm/runcommand.log via SFTP: https://retropie.org.uk/docs/Transferring-Roms/#sftp

LektroiD

@dankcushions Thanks for your reply, but this is not working. I have followed the instructions to the word, inserted all the information into Cyberduck exactly, there is nowhere to add an IP address in Cyberduck, so obviously I could not enter that, and it refuses connect.

Is there another easier way to get this file?

Zering

@lektroid I would recommend using WinSCP.

LektroiD

@zering There does not appear to be a mac version of this for download, I tried 'other downloads' and no mac version there either. Cyberduck was recommended in the documentation, which is why I downloaded that.

mitu

@lektroid said in Some my emulators are slow / glitchy audio:

Is there another easier way to get this file?

Make sure you enabled SSH on your PI before attempting to connect to it via SFTP/SSH.

Another option would be to copy the file to the roms folder, then copy it via file shares, from the Finder. After running the emulator, exit EmulationStation and run

cp /dev/shm/runcommand.log $HOME/RetroPie/roms/

You can find the file at \\retropie\roms, along with the rest of the rom/games folders.

LektroiD

@mitu Yes, SSH was enabled as per instructions in the docs, which I have followed to the word...

I tried to enter the command by pressing F4 on the RP400 keyboard, then typing "cp /dev/shm/runcommand.log $HOME/RetroPie/roms/" and it says no such file or directory. So I tried "cp /dev/shm/runcommand.log", but it says missing destination file operand after 'cp /dev/shm/runcommand.log $HOME/RetroPie/roms/' Try 'cp --help' for more information

mitu

Are you running the cp command after running the game ? The log file is not persisted between reboots, so if you haven't run the game, there won't be any file.

LektroiD

@mitu said in Some my emulators are slow / glitchy audio:

Are you running the cp command after running the game ? The log file is not persisted between reboots, so if you haven't run the game, there won't be any file.

@mitu I only get one chance to open that menu... I start a game, then press A on the controller, then 'L - Launch With Verbose Logging'.

dankcushions

@lektroid said in Some my emulators are slow / glitchy audio:

@dankcushions Thanks for your reply, but this is not working. I have followed the instructions to the word, inserted all the information into Cyberduck exactly, there is nowhere to add an IP address in Cyberduck, so obviously I could not enter that, and it refuses connect.

there sure is - i use it myself:

Open Connection > Server prompt.

dankcushions

@lektroid said in Some my emulators are slow / glitchy audio:

@mitu said in Some my emulators are slow / glitchy audio:

Are you running the cp command after running the game ? The log file is not persisted between reboots, so if you haven't run the game, there won't be any file.

@mitu I only get one chance to open that menu... I start a game, then press A on the controller, then 'L - Launch With Verbose Logging'.

that's fine, but if you reboot AFTER launching the game but BEFORE attempting to access the file, it will go away. try launching the game again and then try and get the file immediately and paste us the output of the failed commands please.

LektroiD

Finally I have the file. This is outputted from the Vectrex emulator. I can not get one from the C64 emulator, as there is no way to shut the app down after using it, so the unit needs to be unplugged to come out of the app, meaning the log file will disappear...

Parameters: 
Executing: /opt/retropie/emulators/retroarch/bin/retroarch -L /opt/retropie/libretrocores/lr-vecx/vecx_libretro.so --config /opt/retropie/configs/vectrex/retroarch.cfg "/home/pi/RetroPie/roms/vectrex/Bedlam (USA, Europe).vec" --verbose --appendconfig /dev/shm/retroarch.cfg
[INFO] RetroArch 1.8.8 (Git 9552f87)
[INFO] Redirecting save file to "/home/pi/RetroPie/roms/vectrex/Bedlam (USA, Europe).srm".
[INFO] Redirecting save state to "/home/pi/RetroPie/roms/vectrex/Bedlam (USA, Europe).state".
[INFO] === Build =======================================
[INFO] Capabilities:  NEON VFPv3 VFPv4
[INFO] Built: Nov  2 2020
[INFO] Version: 1.8.8
[INFO] Git: 9552f87
[INFO] =================================================
[INFO] Loading dynamic libretro core from: "/opt/retropie/libretrocores/lr-vecx/vecx_libretro.so"
[INFO] [Overrides] no core-specific overrides found at /home/pi/.config/retroarch/config/VecX/VecX.cfg.
[INFO] [Overrides] no content-dir-specific overrides found at /home/pi/.config/retroarch/config/VecX/vectrex.cfg.
[INFO] [Overrides] no game-specific overrides found at /home/pi/.config/retroarch/config/VecX/Bedlam (USA, Europe).cfg.
[INFO] [Environ]: GET_LANGUAGE: "0".
[INFO] [Environ]: RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL.
[INFO] [Remaps]: remap directory: /opt/retropie/configs/vectrex/
[INFO] Redirecting save file to "/home/pi/RetroPie/roms/vectrex/Bedlam (USA, Europe).srm".
[INFO] Redirecting save state to "/home/pi/RetroPie/roms/vectrex/Bedlam (USA, Europe).state".
[INFO] [Environ]: GET_LOG_INTERFACE.
[INFO] [Environ]: PERFORMANCE_LEVEL: 5.
[INFO] [Environ]: SET_PIXEL_FORMAT: XRGB8888.
[INFO] [Environ]: SET_HW_RENDER.
[INFO] Requesting OpenGLES2 context.
[INFO] SET_GEOMETRY: 824x1024, aspect: 0.805.
[INFO] Loading content file: /home/pi/RetroPie/roms/vectrex/Bedlam (USA, Europe).vec.
[INFO] Did not find a valid content patch.
[INFO] [Environ]: SET_PIXEL_FORMAT: XRGB8888.
[INFO] [Environ]: SET_HW_RENDER.
[INFO] Requesting OpenGLES2 context.
[INFO] [Environ]: RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY.
[INFO] [Environ]: SET_INPUT_DESCRIPTORS:
[INFO] Skipping SRAM load..
[INFO] Version of libretro API: 1
[INFO] Compiled against API: 1
[INFO] [Cheats]: Load game-specific cheatfile: /home/pi/.config/retroarch/cheats/VecX/Bedlam (USA, Europe).cht
[INFO] [Audio]: Set audio input rate to: 44100.00 Hz.
[INFO] [Video]: Timings deviate too much. Will not adjust. (Display = 30.00 Hz, Game = 50.00 Hz)
[INFO] [Video]: Game FPS > Monitor FPS. Cannot rely on VSync.
[INFO] [Video]: Video @ 3840x2160
[INFO] [Video]: Using HW render, OpenGL driver forced.
[INFO] [Video]: Using configured "gl" driver for GL HW render.
[INFO] [DRM]: Found 1 connectors.
[INFO] [DRM]: Connector 0 connected: yes
[INFO] [DRM]: Connector 0 has 50 modes.
[INFO] [DRM]: Connector 0 assigned to monitor index: #1.
[INFO] [DRM]: Mode 0: (3840x2160) 3840 x 2160, 30 Hz
[INFO] [DRM]: Mode 1: (4096x2160) 4096 x 2160, 30 Hz
[INFO] [DRM]: Mode 2: (4096x2160) 4096 x 2160, 30 Hz
[INFO] [DRM]: Mode 3: (4096x2160) 4096 x 2160, 25 Hz
[INFO] [DRM]: Mode 4: (4096x2160) 4096 x 2160, 24 Hz
[INFO] [DRM]: Mode 5: (4096x2160) 4096 x 2160, 24 Hz
[INFO] [DRM]: Mode 6: (3840x2160) 3840 x 2160, 30 Hz
[INFO] [DRM]: Mode 7: (3840x2160) 3840 x 2160, 25 Hz
[INFO] [DRM]: Mode 8: (3840x2160) 3840 x 2160, 24 Hz
[INFO] [DRM]: Mode 9: (3840x2160) 3840 x 2160, 24 Hz
[INFO] [DRM]: Mode 10: (1920x1080) 1920 x 1080, 60 Hz
[INFO] [DRM]: Mode 11: (1920x1080) 1920 x 1080, 60 Hz
[INFO] [DRM]: Mode 12: (1920x1080i) 1920 x 1080, 60 Hz
[INFO] [DRM]: Mode 13: (1920x1080i) 1920 x 1080, 60 Hz
[INFO] [DRM]: Mode 14: (1920x1080) 1920 x 1080, 50 Hz
[INFO] [DRM]: Mode 15: (1920x1080i) 1920 x 1080, 50 Hz
[INFO] [DRM]: Mode 16: (1920x1080) 1920 x 1080, 30 Hz
[INFO] [DRM]: Mode 17: (1920x1080) 1920 x 1080, 30 Hz
[INFO] [DRM]: Mode 18: (1920x1080) 1920 x 1080, 25 Hz
[INFO] [DRM]: Mode 19: (1920x1080) 1920 x 1080, 24 Hz
[INFO] [DRM]: Mode 20: (1920x1080) 1920 x 1080, 24 Hz
[INFO] [DRM]: Mode 21: (1680x1050) 1680 x 1050, 60 Hz
[INFO] [DRM]: Mode 22: (1600x900) 1600 x 900, 60 Hz
[INFO] [DRM]: Mode 23: (1280x1024) 1280 x 1024, 75 Hz
[INFO] [DRM]: Mode 24: (1280x1024) 1280 x 1024, 60 Hz
[INFO] [DRM]: Mode 25: (1440x900) 1440 x 900, 60 Hz
[INFO] [DRM]: Mode 26: (1280x800) 1280 x 800, 60 Hz
[INFO] [DRM]: Mode 27: (1152x864) 1152 x 864, 75 Hz
[INFO] [DRM]: Mode 28: (1280x720) 1280 x 720, 60 Hz
[INFO] [DRM]: Mode 29: (1280x720) 1280 x 720, 60 Hz
[INFO] [DRM]: Mode 30: (1280x720) 1280 x 720, 50 Hz
[INFO] [DRM]: Mode 31: (1024x768) 1024 x 768, 75 Hz
[INFO] [DRM]: Mode 32: (1024x768) 1024 x 768, 70 Hz
[INFO] [DRM]: Mode 33: (1024x768) 1024 x 768, 60 Hz
[INFO] [DRM]: Mode 34: (832x624) 832 x 624, 75 Hz
[INFO] [DRM]: Mode 35: (800x600) 800 x 600, 75 Hz
[INFO] [DRM]: Mode 36: (800x600) 800 x 600, 72 Hz
[INFO] [DRM]: Mode 37: (800x600) 800 x 600, 60 Hz
[INFO] [DRM]: Mode 38: (720x576) 720 x 576, 50 Hz
[INFO] [DRM]: Mode 39: (720x576i) 720 x 576, 50 Hz
[INFO] [DRM]: Mode 40: (720x480) 720 x 480, 60 Hz
[INFO] [DRM]: Mode 41: (720x480) 720 x 480, 60 Hz
[INFO] [DRM]: Mode 42: (720x480i) 720 x 480, 60 Hz
[INFO] [DRM]: Mode 43: (720x480i) 720 x 480, 60 Hz
[INFO] [DRM]: Mode 44: (640x480) 640 x 480, 75 Hz
[INFO] [DRM]: Mode 45: (640x480) 640 x 480, 73 Hz
[INFO] [DRM]: Mode 46: (640x480) 640 x 480, 67 Hz
[INFO] [DRM]: Mode 47: (640x480) 640 x 480, 60 Hz
[INFO] [DRM]: Mode 48: (640x480) 640 x 480, 60 Hz
[INFO] [DRM]: Mode 49: (720x400) 720 x 400, 70 Hz
[INFO] [GL]: Found GL context: kms
[INFO] [GL]: Detecting screen resolution 3840x2160.
[INFO] [EGL] Found EGL client version >= 1.5, trying eglGetPlatformDisplay
[INFO] [EGL]: EGL version: 1.4
[INFO] [EGL]: Current context: 0x2a3abb0.
[INFO] [KMS]: New FB: 3840x2160 (stride: 15360).
[INFO] [GL]: Vendor: Broadcom, Renderer: V3D 4.2.
[INFO] [GL]: Version: OpenGL ES 3.1 Mesa 19.3.2.
[INFO] [GL]: Using resolution 3840x2160
[INFO] [GL]: Default shader backend found: glsl.
[INFO] [Shaders]: preset directory: /home/pi/.config/retroarch/config
[INFO] [Shaders]: preset directory: /opt/retropie/configs/vectrex/
[INFO] [Shaders]: preset directory: /home/pi/.config/retroarch/shaders/presets
[INFO] [Shader driver]: Using GLSL shader backend.
[WARN] [GL]: Stock GLSL shaders will be used.
[INFO] [GLSL]: Found GLSL vertex shader.
[INFO] [GLSL]: Found GLSL fragment shader.
[INFO] [GLSL]: Linking GLSL program.
[INFO] [GLSL]: Found GLSL vertex shader.
[INFO] [GLSL]: Found GLSL fragment shader.
[INFO] [GLSL]: Linking GLSL program.
[INFO] [GLSL]: Found GLSL vertex shader.
[INFO] [GLSL]: Found GLSL fragment shader.
[INFO] [GLSL]: Linking GLSL program.
[INFO] [GL]: Using 1 textures.
[INFO] [GL]: Loaded 1 program(s).
[INFO] [GL]: Initializing HW render (2048 x 2048).
[INFO] [GL]: Max texture size: 4096 px, renderbuffer size: 4096 px.
[INFO] [GL]: Supports FBO (render-to-texture).
[INFO] [udev]: Keyboard #0 (/dev/input/event0).
[INFO] [udev]: Mouse #0 (/dev/input/event2).
[INFO] [udev]: Mouse #1 (/dev/input/mouse0).
[INFO] [udev]: Plugged pad: Sony Interactive Entertainment Wireless Controller (1356:2508) on port #0.
[INFO] [udev]: Pad #0 (/dev/input/event4) supports force feedback.
[INFO] [udev]: Pad #0 (/dev/input/event4) supports 16 force feedback effects.
[INFO] [Joypad]: Found joypad driver: "udev".
[INFO] [Font]: Using font rendering backend: stb-unicode.
[INFO] [Video]: Found display server: null
[INFO] Found shader "/home/pi/.config/retroarch/shaders/2xsal-level2-crt.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/2xsal.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/2xScaleHQ.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/barrel-distortion.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/barrel-distortion_lanczos4.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/barrel-distortion_phosphor.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/barrel-distortion_snes.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/Brighter-with_Contrast.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/bsnes_gamma_ramp.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/crt-pi-curvature-vertical.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/crt-pi-curvature.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/crt-pi-vertical.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/crt-pi.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/gameboy-screen-grid.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/gameboy.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/gameboy2.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/gba-color.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq2x&lcd3x.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq2x.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq2x2.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq2x_lcd3x.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq2x_phosphor.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq2xwaterpaint.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq2xwaterpaintscanline.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq4x.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/hq4x_lcd3x.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/nds-color.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/nds.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/nedi.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/palm-color.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/phosphor.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/psp-color.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/sharp-bilinear-2x-prescale.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/sharp-bilinear-scanlines.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/sharp-bilinear-simple.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes2.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_hq2x.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_hq2xwaterpaint.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_hq2xwaterpainthicontrast.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_hq2xwaterpaintscanline.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_lcd3x.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_phosphor.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_scanline.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/snes_waterpaint.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/stock.glsl"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/super-2xsai.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/super-eagle.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/vba-color.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/xbr-lv1-noblend.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/zfast_crt_curve.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/zfast_crt_curve_vertical.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/zfast_crt_standard.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/zfast_crt_standard_vertical.glslp"
[INFO] Found shader "/home/pi/.config/retroarch/shaders/zfast_lcd_standard.glslp"
[INFO] [ALSA]: Using signed 16-bit format.
[INFO] [ALSA]: Period size: 768 frames
[INFO] [ALSA]: Buffer size: 3072 frames
[INFO] [ALSA]: Can pause: no.
[INFO] [Menu]: Found menu display driver: "gl".
[INFO] [Font]: Using font rendering backend: stb-unicode.
[INFO] [Font]: Using font rendering backend: stb-unicode.
[INFO] [Font]: Using font rendering backend: stb-unicode.
[INFO] [Menu]: Found menu display driver: "gl".
[INFO] [LED]: LED driver = 'null' 0x4b477c
[INFO] [MIDI]: Initializing ...
[INFO] [MIDI]: Input disabled.
[INFO] [MIDI]: Output disabled.
[INFO] [MIDI]: Initialized "alsa" driver.
[INFO] Loading history file: [/opt/retropie/configs/vectrex/content_history.lpl].
[INFO] Loading history file: [/opt/retropie/configs/vectrex/content_music_history.lpl].
[INFO] Loading history file: [/opt/retropie/configs/vectrex/content_video_history.lpl].
[INFO] Loading history file: [/opt/retropie/configs/vectrex/content_image_history.lpl].
[INFO] Loading favorites file: [/opt/retropie/configs/vectrex/content_favorites.lpl].
[INFO] [GL]: VSync => off
[INFO] [KMS]: New FB: 3840x2160 (stride: 15360).
[INFO] [KMS]: New FB: 3840x2160 (stride: 15360).
[INFO] [Cheats]: Save game-specific cheatfile: /home/pi/.config/retroarch/cheats/VecX/Bedlam (USA, Europe).cht
[INFO] Content ran for a total of: 00 hours, 00 minutes, 07 seconds.
[INFO] Unloading game..
[INFO] Unloading core..
[INFO] Unloading core symbols..
[INFO] [Core Options]: Saved core options file to "/opt/retropie/configs/all/retroarch-core-options.cfg"

mitu

Your resolution is 4k@30hz. It's a bit too much too handle for emulation - I suggest you lower your resolution to 1080p@60hz.

The Pi4 doesn't output 4k@60hz by default, if you want to still keep the 4k resolution, then enable 4k@60hz from raspi-config or add to /boot/config.txt:

hdmi_enable_4kp60=1

dankcushions

@lektroid

please format your logs correctly - see https://retropie.org.uk/forum/topic/3/read-this-first ('code blocks' section). i have edited your post this time :)

Finally I have the file. This is outputted from the Vectrex emulator. I can not get one from the C64 emulator, as there is no way to shut the app down after using it, so the unit needs to be unplugged to come out of the app, meaning the log file will disappear...

are you using escape key to exit? see https://retropie.org.uk/docs/Commodore-64-VIC-20-PET/

as for your log, the problem is as i expected:

[INFO] [Video]: Timings deviate too much. Will not adjust. (Display = 30.00 Hz, Game = 50.00 Hz)
[INFO] [Video]: Game FPS > Monitor FPS. Cannot rely on VSync.
[INFO] [Video]: Video @ 3840x2160

you're using a 4k30 mode. select a 1080p60 resolution mode via raspi-config (available on the retropie settings section in emulationstation)

LektroiD

@mitu said in Some my emulators are slow / glitchy audio:

Your resolution is 4k@30hz. It's a bit too much too handle for emulation - I suggest you lower your resolution to 1080p@60hz.

The Pi4 doesn't output 4k@60hz by default, if you want to still keep the 4k resolution, then enable 4k@60hz from raspi-config or add to /boot/config.txt:
hdmi_enable_4kp60=1

Hi, I cannot change the resolution, when I go into Raspi-Config I select "2 Display Options", then "D1 Resolution", and it just jumps back to the first Raspi-Config screen, and thus loops around those two menus. I tried entering the code you suggested, but the audio is still slow and glitchy.

dankcushions

@lektroid you can manually set the mode in /boot/config.txt

for example, for 1080p on mine I use

hdmi_group=2
hdmi_mode=82

you could try that or

hdmi_group=1
hdmi_mode=16

these are the typical ones.

mitu

As an alternative to raspi-config, you can add to your /boot/config.txt file:

hdmi_group=1
hdmi_mode=16

and remove the hdmi_enable_4kp60 line.

LektroiD

@mitu said in Some my emulators are slow / glitchy audio:

hdmi_group=1
hdmi_mode=16

Tried saving the file with the new settings, but it says the file is locked and won't let me save