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Kolega mel Fedoru, ted to same zkousel na Ubuntu LTS 20.04 stale s nvidii (ale ted s verzi 440.100) stale mel v .bashrc radek export VDPAU_DRIVER="nouveau" ale ono to nefungovalo ani na neCT kanaly. Rozdil byl v tom ze nemel nainstalovany nouveau_firmware, ted mu to zase hraje ackoliv akcelerace nefunguje aspon to nevypisuje chybovou zpravu jako v pripade kdyz zkousel export VDPAU_DRIVER="va_gl" ackoliv to take hralo ... mel nainstalovane z repa i libvdpau-va-gl1 (ale roky nevyvijene)

$ export VDPAU_DRIVER="nouveau"
@:~$ kaffeine 
[00007f277c0fb7b0] mpeg4audio packetizer: AAC channels: 2 samplerate: 48000
[00007f277c032b00] main decoder error: buffer deadlock prevented
[hevc @ 0x7f2764083300] get_buffer() failed
[hevc @ 0x7f2764083300] thread_get_buffer() failed

@:~$ export VDPAU_DRIVER="va_gl"
@:~$ kaffeine 
[00007fc84c0fb9e0] mpeg4audio packetizer: AAC channels: 2 samplerate: 48000
libva info: VA-API version 1.7.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so
libva info: va_openDriver() returns -1
[00007fc838003390] glconv_vdpau gl error: glVDPAUInitNV failed: 0x502

[00007fc84c0367c0] avcodec decoder: Using OpenGL/VAAPI backend for VDPAU for hardware decoding
[hevc @ 0x7fc84c057d80] Failed setup for format vdpau: hwaccel initialisation returned error.
[00007fc84c0367c0] avcodec decoder error: existing hardware acceleration cannot be reused
[hevc @ 0x7fc84c0a7bc0] get_buffer() failed
[hevc @ 0x7fc84c0a7bc0] thread_get_buffer() failed

@:~$ export VDPAU_DRIVER="nvidia"
@:~$ kaffeine
[00007f70940fb0f0] mpeg4audio packetizer: AAC channels: 2 samplerate: 48000
[00007f7094035bd0] avcodec decoder: Using NVIDIA VDPAU Driver Shared Library  440.100  Fri May 29 08:12:22 UTC 2020 for hardware decoding
[00007f7094035bd0] avcodec decoder error: hardware acceleration picture allocation failed
[hevc @ 0x7f70940e95c0] get_buffer() failed
[hevc @ 0x7f70940e95c0] thread_get_buffer() failed
[00007f7094035bd0] avcodec decoder error: avcodec_send_packet critical error
[00007f70490c29a0] mpeg4audio packetizer: AAC channels: 2 samplerate: 48000
[00007f7049011e00] avcodec decoder: Using NVIDIA VDPAU Driver Shared Library  440.100  Fri May 29 08:12:22 UTC 2020 for hardware decoding
[00007f7049011e00] main decoder error: buffer deadlock prevented
[hevc @ 0x7f70b0092e80] Could not find ref with POC 26
[hevc @ 0x7f70b0092e80] Could not find ref with POC 28
[00007f7049011e00] avcodec decoder error: avcodec_send_packet critical error
Mpeg4GASpecificConfig: error 1
[00007f70490c29a0] mpeg4audio packetizer error: latm sub frames not yet supported, please send a sample
[00007f70490c29a0] mpeg4audio packetizer: AAC channels: 2 samplerate: 22050
[00007f705441ed40] mpeg4audio packetizer: AAC channels: 2 samplerate: 48000
[00007f7054018310] avcodec decoder: Using NVIDIA VDPAU Driver Shared Library  440.100  Fri May 29 08:12:22 UTC 2020 for hardware decoding
[00007f7054018310] avcodec decoder error: hardware acceleration picture allocation failed
[hevc @ 0x7f704903bf00] get_buffer() failed
[hevc @ 0x7f704903bf00] thread_get_buffer() failed
[hevc @ 0x7f704904c4c0] Could not find ref with POC -36
[00007f7054018310] avcodec decoder error: avcodec_send_packet critical error

jinak jeste vdpauinfo

$ vdpauinfo 
display: :1   screen: 0
API version: 1
Information string: NVIDIA VDPAU Driver Shared Library  440.100  Fri May 29 08:12:22 UTC 2020

Video surface:

name   width height types
-------------------------------------------
420     8192  8192  NV12 YV12 
422     8192  8192  UYVY YUYV 
444     8192  8192  

Decoder capabilities:

name                        level macbs width height
----------------------------------------------------
MPEG1                           0 65536  4096  4096
MPEG2_SIMPLE                    3 65536  4096  4096
MPEG2_MAIN                      3 65536  4096  4096
H264_BASELINE                  51 65536  4096  4096
H264_MAIN                      51 65536  4096  4096
H264_HIGH                      51 65536  4096  4096
VC1_SIMPLE                      1  8190  2048  2048
VC1_MAIN                        2  8190  2048  2048
VC1_ADVANCED                    4  8190  2048  2048
MPEG4_PART2_SP                  3  8192  2048  2048
MPEG4_PART2_ASP                 5  8192  2048  2048
DIVX4_QMOBILE                   0  8192  2048  2048
DIVX4_MOBILE                    0  8192  2048  2048
DIVX4_HOME_THEATER              0  8192  2048  2048
DIVX4_HD_1080P                  0  8192  2048  2048
DIVX5_QMOBILE                   0  8192  2048  2048
DIVX5_MOBILE                    0  8192  2048  2048
DIVX5_HOME_THEATER              0  8192  2048  2048
DIVX5_HD_1080P                  0  8192  2048  2048
H264_CONSTRAINED_BASELINE      51 65536  4096  4096
H264_EXTENDED                  51 65536  4096  4096
H264_PROGRESSIVE_HIGH          51 65536  4096  4096
H264_CONSTRAINED_HIGH          51 65536  4096  4096
H264_HIGH_444_PREDICTIVE       51 65536  4096  4096
HEVC_MAIN                      153 262144  8192  8192
HEVC_MAIN_10                   --- not supported ---
HEVC_MAIN_STILL                --- not supported ---
HEVC_MAIN_12                   --- not supported ---
HEVC_MAIN_444                  --- not supported ---

Output surface:

name              width height nat types
----------------------------------------------------
B8G8R8A8         32768 32768    y  Y8U8V8A8 V8U8Y8A8 A4I4 I4A4 A8I8 I8A8 
R10G10B10A2      32768 32768    y  Y8U8V8A8 V8U8Y8A8 A4I4 I4A4 A8I8 I8A8 

... jak pise tygr zkusit to r600 ackoliv akcelerace asi stejne nepujde aspon by to mohlo hrat.