aRDP to krdpserver

[Razvan Eduard]

on kubuntu 25.04 I start krdpserver with

krdpserver -u test -p test --address 192.168.1.2 --port 3389

I can connect to it with "Thincast Remote Desktop Client" from a windows 11.

WHen I try from aRDP pro (with RDP GFx enabled) it does connect but it is showing a black screen. As soon as I tap the screen the connection close and krdp show this:

org.kde.krdp: New client connected:  Unspecified platform Unspecified version
org.kde.krdp: Video stream initialized
org.kde.krdp: Received caps:
org.kde.krdp:   RDPGFX_CAPVERSION_8 AVC: false YUV420: false
org.kde.krdp:   RDPGFX_CAPVERSION_81 AVC: false YUV420: false
org.kde.krdp:   RDPGFX_CAPVERSION_10 AVC: false YUV420: false
org.kde.krdp:   RDPGFX_CAPVERSION_101 AVC: true YUV420: false
org.kde.krdp:   RDPGFX_CAPVERSION_102 AVC: false YUV420: false
org.kde.krdp:   RDPGFX_CAPVERSION_103 AVC: false YUV420: false
org.kde.krdp:   RDPGFX_CAPVERSION_104 AVC: false YUV420: true
org.kde.krdp:   RDPGFX_CAPVERSION_105 AVC: false YUV420: true
org.kde.krdp:   RDPGFX_CAPVERSION_106 AVC: false YUV420: true
org.kde.krdp:   UNKNOWN_VERSION AVC: false YUV420: false
org.kde.krdp:   RDPGFX_CAPVERSION_107 AVC: false YUV420: true
org.kde.krdp: Client does not support H.264 in YUV420 mode!
[07:21:22:255] [3612:00000e38] [INFO][com.freerdp.core] - [rdp_print_errinfo]: ERRINFO_GRAPHICS_SUBSYSTEM_FAILED (0x0000112F):The server-side graphics subsystem is in an error state and unable to continue graphics encoding.
[07:21:22:255] [3612:00000e38] [ERROR][com.freerdp.core.peer] - [rdp_set_error_info]: ERRINFO_GRAPHICS_SUBSYSTEM_FAILED [0x0001112F]
[07:21:22:255] [3612:00000e38] [ERROR][com.freerdp.channels.rdpgfx.server] - [rdpgfx_recv_caps_advertise_pdu]: context->CapsAdvertise failed with error 20
[07:21:22:255] [3612:00000e38] [ERROR][com.freerdp.channels.rdpgfx.server] - [rdpgfx_server_receive_pdu]: rdpgfx_recv_caps_advertise_pdu failed with error 20!
[07:21:22:255] [3612:00000e38] [ERROR][com.freerdp.channels.rdpgfx.server] - [rdpgfx_server_receive_pdu]: Error while parsing GFX cmdId: RDPGFX_CMDID_CAPSADVERTISE (0x0012)
[07:21:22:255] [3612:00000e38] [ERROR][com.freerdp.channels.rdpgfx.server] - [rdpgfx_server_handle_messages]: rdpgfx_server_receive_pdu failed with error 20!
[07:21:22:255] [3612:00000e38] [ERROR][com.freerdp.channels.rdpgfx.server] - [rdpgfx_server_thread_func]: rdpgfx_server_handle_messages failed with error 20
kpipewire_record_logging: Hardware encoding is not supported on this device.
[libx264 @ 0x78d030655fc0] -qscale is ignored, -crf is recommended.
[libx264 @ 0x78d030655fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[07:21:22:270] [3612:00000e34] [ERROR][com.freerdp.core.transport] - [transport_read_layer]: BIO_read retries exceeded
org.kde.krdp: Unable to check file descriptor
org.kde.krdp: Closing session
[libx264 @ 0x78d030655fc0] profile Constrained Baseline, level 6.1, 4:2:0, 8-bit
kpipewire_dmabuf_logging: eglChooseConfig returned this many configs: 1
[libx264 @ 0x78d030655fc0] frame I:1     Avg QP:20,00  size:523863
[libx264 @ 0x78d030655fc0] mb I  I16..4: 100,0%  0,0%  0,0%
[libx264 @ 0x78d030655fc0] coded y,uvDC,uvAC intra: 57,1% 55,9% 54,3%
[libx264 @ 0x78d030655fc0] i16 v,h,dc,p: 50% 36% 13%  1%
[libx264 @ 0x78d030655fc0] i8c dc,h,v,p: 59% 17% 23%  1%
[libx264 @ 0x78d030655fc0] kb/s:4190903,75
org.kde.krdp: Closing Freedesktop Portal Session

I think the relevant line is

org.kde.krdp: Client does not support H.264 in YUV420 mode!

Thanks

[thisdoesnotrequiresigninma]

Hi,

Great troubleshooting, thanks!

Can you open a ticket for this on https://github.com/iiordanov/remote-desktop-clients/issues ?

[Razvan Eduard]

will do,

Thanks