SOLVED: Splotchy Celluloid video playback in Mint21 Cinnamon

[SunWorks]

Hello,
When I play a video in Celluloid, the playback is splotchy, pixelated and sometimes just a grainy green screen.
This does *not* happen in VLC.
This did *not* happen in Mint 20 with Celluloid or VLC.
As the title states, I am using Mint 21 Cinnamon.

It's very annoying as I prefer to use Celluloid for video playback because I use VLC for other things.

Here's my system info:

Code: Select all

inxi -G
Graphics:
  Device-1: AMD Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM]
    driver: radeon v: kernel
  Display: x11 server: X.Org v: 1.21.1.3 driver: X: loaded: ati,radeon
    unloaded: fbdev,modesetting,vesa gpu: radeon resolution: 1920x1080~60Hz
  OpenGL: renderer: AMD CAICOS (DRM 2.50.0 / 5.15.0-58-generic LLVM 13.0.1)
    v: 3.3 Mesa 22.0.5

and:

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System:
  Kernel: 5.15.0-58-generic x86_64 bits: 64 compiler: gcc v: 11.3.0 Desktop: Cinnamon 5.4.12
    tk: GTK 3.24.33 wm: Mutter dm: LightDM Distro: Linux Mint 21 Vanessa base: Ubuntu 22.04 jammy
Machine:
  Type: Desktop System: Dell product: OptiPlex 790 v: 01 serial: <superuser required> Chassis:
    type: 3 serial: <superuser required>
  Mobo: Dell model: 0J3C2F v: A02 serial: <superuser required> BIOS: Dell v: A13
    date: 04/02/2012
CPU:
  Info: quad core model: Intel Core i5-2400 bits: 64 type: MCP arch: Sandy Bridge rev: 7 cache:
    L1: 256 KiB L2: 1024 KiB L3: 6 MiB
  Speed (MHz): avg: 3250 high: 3270 min/max: 1600/3400 cores: 1: 3248 2: 3270 3: 3231 4: 3251
    bogomips: 24743
  Flags: avx ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: AMD Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM] vendor: Dell driver: radeon
    v: kernel pcie: speed: 5 GT/s lanes: 16 ports: active: DVI-I-1 empty: DP-1 bus-ID: 01:00.0
    chip-ID: 1002:6778
  Display: x11 server: X.Org v: 1.21.1.3 driver: X: loaded: ati,radeon
    unloaded: fbdev,modesetting,vesa gpu: radeon display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96
  Monitor-1: DVI-0 mapped: DVI-I-1 model: Acer K222HQL res: 1920x1080 dpi: 102
    diag: 547mm (21.5")
  OpenGL: renderer: AMD CAICOS (DRM 2.50.0 / 5.15.0-58-generic LLVM 13.0.1) v: 3.3 Mesa 22.0.5
    compat-v: 3.1 direct render: Yes
Audio:
  Device-1: Intel 6 Series/C200 Series Family High Definition Audio vendor: Dell
    driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 chip-ID: 8086:1c20
  Device-2: AMD Caicos HDMI Audio [Radeon HD 6450 / 7450/8450/8490 OEM R5 230/235/235X OEM]
    vendor: Dell driver: snd_hda_intel v: kernel pcie: speed: 5 GT/s lanes: 16 bus-ID: 01:00.1
    chip-ID: 1002:aa98
  Sound Server-1: ALSA v: k5.15.0-58-generic running: yes
  Sound Server-2: JACK v: 1.9.20 running: no
  Sound Server-3: PulseAudio v: 15.99.1 running: yes
  Sound Server-4: PipeWire v: 0.3.48 running: yes
Bluetooth:
  Device-1: Cambridge Silicon Radio Bluetooth Dongle (HCI mode) type: USB driver: btusb v: 0.8
    bus-ID: 2-1.8:7 chip-ID: 0a12:0001
  Report: hciconfig ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 2.1 lmp-v: 4.0
    sub-v: 22bb

Swap:
  ID-1: swap-1 type: partition size: 16.11 GiB used: 4.38 GiB (27.2%) priority: -2 dev: /dev/sda1

Sensors:
  System Temperatures: cpu: 35.0 C mobo: N/A gpu: radeon temp: 56.5 C
  Fan Speeds (RPM): N/A

Any ideas?
Thank you in advance.

[Hoser Rob]

The 1st thing recommended by the devs of mpv (the Celluloiod backend) if you're having video playback issues is to see if hardware decoding (hwdec in mpv-speak) is turned on. If it is, turn it off.

[SunWorks]

The 1st thing... is to see if hardware decoding (hwdec in mpv-speak) is turned on. If it is, turn it off.

Thank you very much.
That worked.

In Celluloid.
Choose 'Preferences'
Choose 'Miscellaneous' tab
At the panel bottom, under "Extra mpv options:"
Change to:
hwdec=no

Click Save.