In my case, hardware accelerated transcoding hardware/format detection succeeds. The final analysis finds VAAPI available for both decoding and encoding:
Sep 08, 2023 16:13:53.778 [140133279042360] INFO - [Req#d6/Transcode] Preparing driver imd for GPU JasperLake [UHD Graphics]
Sep 08, 2023 16:13:53.778 [140133279042360] DEBUG - [Req#d6/Transcode/DriverDL/imd] Skipping download; already exists
Sep 08, 2023 16:13:53.778 [140133279042360] DEBUG - [Req#d6/Transcode] TPU: hardware transcoding: final decoder: vaapi, final encoder: vaapi
Sep 08, 2023 16:13:53.778 [140133279042360] DEBUG - [Req#d6/Transcode/JobRunner] Job running: FFMPEG_EXTERNAL_LIBS='/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/55f77b3-4598-linux-x86_64/' LIBVA_DRIVERS_PATH="/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Cache/va-dri-linux-x86_64" OCL_ICD_VENDORS="/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Cache/cl-icds-linux-x86_64" X_PLEX_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx cl_cache_dir="/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Cache/Shaders/icr-117-linux-x86_64/" "/usr/lib/plexmediaserver/Plex Transcoder" "-codec:#0x01" hevc "-hwaccel:#0x01" vaapi "-hwaccel_fallback_threshold:#0x01" 10 "-hwaccel_output_format:#0x01" vaapi "-hwaccel_device:#0x01" vaapi "-codec:#0x02" aac_lc -analyzeduration 20000000 -probesize 20000000 -i "/mnt/csmedia/dvr/test/Life Untouched 4K Demo.mp4" -filter_complex "[0:#0x01]hwupload[0];[0]scale_vaapi=w=1280:h=720:format=p010[1];[1]hwmap=derive_device=opencl[2];[2]tonemap_opencl=tonemap=mobius:format=nv12:m=bt709:p=bt709:r=tv[3];[3]hwmap=derive_device=vaapi:reverse=1[4];[4]hwupload[5]" -map "[5]" -metadata:s:0 language=eng -codec:0 h264_vaapi -b:0 2757k -maxrate:0 3676k -bufsize:0 7352k -r:0 59.939999999999998 -force_key_frames:0 "expr:gte(t,n_forced*3)" -filter_complex "[0:#0x02] aresample=async=1:ochl='stereo':rematrix_maxval=0.000000dB:osr=48000[6]" -map "[6]" -codec:1 aac -b:1 119k -f dash -seg_duration 3 -dash_segment_type mp4 -init_seg_name 'init-stream$RepresentationID$.m4s' -media_seg_name 'chunk-stream$RepresentationID$-$Number%05d$.m4s' -window_size 5 -delete_removed false -skip_to_segment 1 -time_delta 0.0625 -manifest_name "http://127.0.0.1:32400/video/:/transcode/session/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191/manifest?X-Plex-Http-Pipeline=infinite" -avoid_negative_ts disabled -map_metadata -1 -map_chapters -1 dash -start_at_zero -copyts -vsync cfr -init_hw_device vaapi=vaapi:/dev/dri/renderD128 -filter_hw_device vaapi -y -nostats -loglevel quiet -loglevel_plex error -progressurl http://127.0.0.1:32400/video/:/transcode/session/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191/progress
It is not until the transcoder attempts to enumerate OpenCL devices that hardware accelerated playback fails and subsequently falls back to software acceleration:
Sep 08, 2023 16:13:53.827 [140133279042360] DEBUG - Request: [10.10.0.101:53754 (Subnet)] GET /video/:/transcode/universal/session/f8roi4revbqg7352k61ykgw6/0/header (7 live) #d9 TLS GZIP Signed-in
Sep 08, 2023 16:13:53.908 [140133330172728] ERROR - [Req#e2/Transcode/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191] [AVHWDeviceContext @ 0x7f764a25c840] Failed to get number of OpenCL platforms: -1001.
Sep 08, 2023 16:13:53.909 [140133330172728] ERROR - [Req#ec/Transcode/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191] [AVHWDeviceContext @ 0x7f764a25c840] Failed to get number of OpenCL platforms: -1001.
Sep 08, 2023 16:13:53.909 [140133330172728] ERROR - [Req#ed/Transcode/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191] [Parsed_hwmap_2 @ 0x7f764f678c80] Failed to created derived device context: -19.
Sep 08, 2023 16:13:53.910 [140133330172728] ERROR - [Req#ee/Transcode/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191] [Parsed_hwmap_2 @ 0x7f764f678c80] Failed to configure output pad on Parsed_hwmap_2
Sep 08, 2023 16:13:53.920 [140133330172728] ERROR - [Req#ef/Transcode/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191] Error reinitializing filters!
Sep 08, 2023 16:13:53.920 [140133330172728] ERROR - [Req#f0/Transcode/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191] Failed to inject frame into filter network: No such device
Sep 08, 2023 16:13:53.921 [140133330172728] ERROR - [Req#f1/Transcode/f8roi4revbqg7352k61ykgw6/ef969138-7266-4672-a132-b9b9d541c191] Error while processing the decoded data for stream #0:0
Sep 08, 2023 16:13:53.937 [140133376432952] DEBUG - Jobs: '/usr/lib/plexmediaserver/Plex Transcoder' exit code for process 13205 is 1 (failure)
Note the “Failed to get number of OpenCL platforms: -1001” messages. This suggests that the transcoder is unable to find the Intel OpenCL ICD.
However, `clinfo` on the same system outputs this:
Number of platforms 1
Platform Name Intel(R) OpenCL HD Graphics
Platform Vendor Intel(R) Corporation
Platform Version OpenCL 3.0
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_byte_addressable_store cl_khr_fp16 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_icd cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_intel_command_queue_families cl_intel_subgroups cl_intel_required_subgroup_size cl_intel_subgroups_short cl_khr_spir cl_intel_accelerator cl_intel_driver_diagnostics cl_khr_priority_hints cl_khr_throttle_hints cl_khr_create_command_queue cl_intel_subgroups_char cl_intel_subgroups_long cl_khr_il_program cl_intel_mem_force_host_memory cl_khr_subgroup_extended_types cl_khr_subgroup_non_uniform_vote cl_khr_subgroup_ballot cl_khr_subgroup_non_uniform_arithmetic cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_khr_subgroup_clustered_reduce cl_intel_device_attribute_query cl_khr_suggested_local_work_size cl_intel_planar_yuv cl_intel_packed_yuv cl_khr_image2d_from_buffer cl_khr_depth_images cl_khr_3d_image_writes cl_intel_media_block_io cl_intel_va_api_media_sharing cl_intel_sharing_format_query cl_khr_pci_bus_info cl_intel_subgroup_local_block_io
Platform Extensions with Version cl_khr_byte_addressable_store 0x400000 (1.0.0)
cl_khr_fp16 0x400000 (1.0.0)
cl_khr_global_int32_base_atomics 0x400000 (1.0.0)
cl_khr_global_int32_extended_atomics 0x400000 (1.0.0)
cl_khr_icd 0x400000 (1.0.0)
cl_khr_local_int32_base_atomics 0x400000 (1.0.0)
cl_khr_local_int32_extended_atomics 0x400000 (1.0.0)
cl_intel_command_queue_families 0x400000 (1.0.0)
cl_intel_subgroups 0x400000 (1.0.0)
cl_intel_required_subgroup_size 0x400000 (1.0.0)
cl_intel_subgroups_short 0x400000 (1.0.0)
cl_khr_spir 0x400000 (1.0.0)
cl_intel_accelerator 0x400000 (1.0.0)
cl_intel_driver_diagnostics 0x400000 (1.0.0)
cl_khr_priority_hints 0x400000 (1.0.0)
cl_khr_throttle_hints 0x400000 (1.0.0)
cl_khr_create_command_queue 0x400000 (1.0.0)
cl_intel_subgroups_char 0x400000 (1.0.0)
cl_intel_subgroups_long 0x400000 (1.0.0)
cl_khr_il_program 0x400000 (1.0.0)
cl_intel_mem_force_host_memory 0x400000 (1.0.0)
cl_khr_subgroup_extended_types 0x400000 (1.0.0)
cl_khr_subgroup_non_uniform_vote 0x400000 (1.0.0)
cl_khr_subgroup_ballot 0x400000 (1.0.0)
cl_khr_subgroup_non_uniform_arithmetic 0x400000 (1.0.0)
cl_khr_subgroup_shuffle 0x400000 (1.0.0)
cl_khr_subgroup_shuffle_relative 0x400000 (1.0.0)
cl_khr_subgroup_clustered_reduce 0x400000 (1.0.0)
cl_intel_device_attribute_query 0x400000 (1.0.0)
cl_khr_suggested_local_work_size 0x400000 (1.0.0)
cl_intel_planar_yuv 0x400000 (1.0.0)
cl_intel_packed_yuv 0x400000 (1.0.0)
cl_khr_image2d_from_buffer 0x400000 (1.0.0)
cl_khr_depth_images 0x400000 (1.0.0)
cl_khr_3d_image_writes 0x400000 (1.0.0)
cl_intel_media_block_io 0x400000 (1.0.0)
cl_intel_va_api_media_sharing 0x400000 (1.0.0)
cl_intel_sharing_format_query 0x400000 (1.0.0)
cl_khr_pci_bus_info 0x400000 (1.0.0)
cl_intel_subgroup_local_block_io 0x400000 (1.0.0)
Platform Numeric Version 0xc00000 (3.0.0)
Platform Extensions function suffix INTEL
Platform Host timer resolution 1ns
Platform Name Intel(R) OpenCL HD Graphics
Number of devices 1
Device Name Intel(R) UHD Graphics [0x4e61]
Device Vendor Intel(R) Corporation
Device Vendor ID 0x8086
Device Version OpenCL 3.0 NEO
Device Numeric Version 0xc00000 (3.0.0)
Driver Version 1.0.0
Device OpenCL C Version OpenCL C 1.2
Device OpenCL C all versions OpenCL C 0x400000 (1.0.0)
OpenCL C 0x401000 (1.1.0)
OpenCL C 0x402000 (1.2.0)
OpenCL C 0xc00000 (3.0.0)
Device OpenCL C features __opencl_c_int64 0xc00000 (3.0.0)
__opencl_c_3d_image_writes 0xc00000 (3.0.0)
__opencl_c_images 0xc00000 (3.0.0)
__opencl_c_read_write_images 0xc00000 (3.0.0)
Latest comfornace test passed v2021-06-16-00
Device Type GPU
Device Profile FULL_PROFILE
Device Available Yes
Compiler Available Yes
Linker Available Yes
Max compute units 24
Max clock frequency 800MHz
Device Partition (core)
Max number of sub-devices 0
Supported partition types None
Supported affinity domains (n/a)
Max work item dimensions 3
Max work item sizes 256x256x256
Max work group size 256
Preferred work group size multiple (device) 32
Preferred work group size multiple (kernel) 32
Max sub-groups per work group 0
Sub-group sizes (Intel) 8, 16, 32
Preferred / native vector sizes
char 16 / 16
short 8 / 8
int 4 / 4
long 1 / 1
half 8 / 8 (cl_khr_fp16)
float 1 / 1
double 1 / 1 (n/a)
Half-precision Floating-point support (cl_khr_fp16)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Single-precision Floating-point support (core)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Correctly-rounded divide and sqrt operations No
Double-precision Floating-point support (n/a)
Address bits 32, Little-Endian
Global memory size 3435970560 (3.2GiB)
Error Correction support No
Max memory allocation 1717985280 (1.6GiB)
Unified memory for Host and Device Yes
Shared Virtual Memory (SVM) capabilities (core)
Coarse-grained buffer sharing No
Fine-grained buffer sharing No
Fine-grained system sharing No
Atomics No
Minimum alignment for any data type 128 bytes
Alignment of base address 1024 bits (128 bytes)
Preferred alignment for atomics
SVM 64 bytes
Global 64 bytes
Local 64 bytes
Atomic memory capabilities relaxed, work-group scope
Atomic fence capabilities relaxed, acquire/release, work-group scope
Max size for global variable 0
Preferred total size of global vars 0
Global Memory cache type Read/Write
Global Memory cache size 524288 (512KiB)
Global Memory cache line size 64 bytes
Image support Yes
Max number of samplers per kernel 16
Max size for 1D images from buffer 107374080 pixels
Max 1D or 2D image array size 2048 images
Base address alignment for 2D image buffers 4 bytes
Pitch alignment for 2D image buffers 4 pixels
Max 2D image size 16384x16384 pixels
Max planar YUV image size 16384x16352 pixels
Max 3D image size 16384x16384x2048 pixels
Max number of read image args 128
Max number of write image args 128
Max number of read/write image args 128
Pipe support No
Max number of pipe args 0
Max active pipe reservations 0
Max pipe packet size 0
Local memory type Local
Local memory size 65536 (64KiB)
Max number of constant args 8
Max constant buffer size 1717985280 (1.6GiB)
Generic address space support No
Max size of kernel argument 2048 (2KiB)
Queue properties (on host)
Out-of-order execution Yes
Profiling Yes
Device enqueue capabilities (n/a)
Queue properties (on device)
Out-of-order execution No
Profiling No
Preferred size 0
Max size 0
Max queues on device 0
Max events on device 0
Prefer user sync for interop Yes
Profiling timer resolution 52ns
Execution capabilities
Run OpenCL kernels Yes
Run native kernels No
Non-uniform work-groups Yes
Work-group collective functions No
Sub-group independent forward progress No
IL version SPIR-V_1.2
ILs with version SPIR-V 0x402000 (1.2.0)
SPIR versions 1.2
printf() buffer size 4194304 (4MiB)
Built-in kernels (n/a)
Built-in kernels with version (n/a)
Device Extensions cl_khr_byte_addressable_store cl_khr_fp16 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_icd cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_intel_command_queue_families cl_intel_subgroups cl_intel_required_subgroup_size cl_intel_subgroups_short cl_khr_spir cl_intel_accelerator cl_intel_driver_diagnostics cl_khr_priority_hints cl_khr_throttle_hints cl_khr_create_command_queue cl_intel_subgroups_char cl_intel_subgroups_long cl_khr_il_program cl_intel_mem_force_host_memory cl_khr_subgroup_extended_types cl_khr_subgroup_non_uniform_vote cl_khr_subgroup_ballot cl_khr_subgroup_non_uniform_arithmetic cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_khr_subgroup_clustered_reduce cl_intel_device_attribute_query cl_khr_suggested_local_work_size cl_intel_planar_yuv cl_intel_packed_yuv cl_khr_image2d_from_buffer cl_khr_depth_images cl_khr_3d_image_writes cl_intel_media_block_io cl_intel_va_api_media_sharing cl_intel_sharing_format_query cl_khr_pci_bus_info cl_intel_subgroup_local_block_io
Device Extensions with Version cl_khr_byte_addressable_store 0x400000 (1.0.0)
cl_khr_fp16 0x400000 (1.0.0)
cl_khr_global_int32_base_atomics 0x400000 (1.0.0)
cl_khr_global_int32_extended_atomics 0x400000 (1.0.0)
cl_khr_icd 0x400000 (1.0.0)
cl_khr_local_int32_base_atomics 0x400000 (1.0.0)
cl_khr_local_int32_extended_atomics 0x400000 (1.0.0)
cl_intel_command_queue_families 0x400000 (1.0.0)
cl_intel_subgroups 0x400000 (1.0.0)
cl_intel_required_subgroup_size 0x400000 (1.0.0)
cl_intel_subgroups_short 0x400000 (1.0.0)
cl_khr_spir 0x400000 (1.0.0)
cl_intel_accelerator 0x400000 (1.0.0)
cl_intel_driver_diagnostics 0x400000 (1.0.0)
cl_khr_priority_hints 0x400000 (1.0.0)
cl_khr_throttle_hints 0x400000 (1.0.0)
cl_khr_create_command_queue 0x400000 (1.0.0)
cl_intel_subgroups_char 0x400000 (1.0.0)
cl_intel_subgroups_long 0x400000 (1.0.0)
cl_khr_il_program 0x400000 (1.0.0)
cl_intel_mem_force_host_memory 0x400000 (1.0.0)
cl_khr_subgroup_extended_types 0x400000 (1.0.0)
cl_khr_subgroup_non_uniform_vote 0x400000 (1.0.0)
cl_khr_subgroup_ballot 0x400000 (1.0.0)
cl_khr_subgroup_non_uniform_arithmetic 0x400000 (1.0.0)
cl_khr_subgroup_shuffle 0x400000 (1.0.0)
cl_khr_subgroup_shuffle_relative 0x400000 (1.0.0)
cl_khr_subgroup_clustered_reduce 0x400000 (1.0.0)
cl_intel_device_attribute_query 0x400000 (1.0.0)
cl_khr_suggested_local_work_size 0x400000 (1.0.0)
cl_intel_planar_yuv 0x400000 (1.0.0)
cl_intel_packed_yuv 0x400000 (1.0.0)
cl_khr_image2d_from_buffer 0x400000 (1.0.0)
cl_khr_depth_images 0x400000 (1.0.0)
cl_khr_3d_image_writes 0x400000 (1.0.0)
cl_intel_media_block_io 0x400000 (1.0.0)
cl_intel_va_api_media_sharing 0x400000 (1.0.0)
cl_intel_sharing_format_query 0x400000 (1.0.0)
cl_khr_pci_bus_info 0x400000 (1.0.0)
cl_intel_subgroup_local_block_io 0x400000 (1.0.0)
NULL platform behavior
clGetPlatformInfo(NULL, CL_PLATFORM_NAME, …) Intel(R) OpenCL HD Graphics
clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, …) Success [INTEL]
clCreateContext(NULL, …) [default] Success [INTEL]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) Success (1)
Platform Name Intel(R) OpenCL HD Graphics
Device Name Intel(R) UHD Graphics [0x4e61]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) Success (1)
Platform Name Intel(R) OpenCL HD Graphics
Device Name Intel(R) UHD Graphics [0x4e61]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL) Success (1)
Platform Name Intel(R) OpenCL HD Graphics
Device Name Intel(R) UHD Graphics [0x4e61]
ICD loader properties
ICD loader Name OpenCL ICD Loader
ICD loader Vendor OCL Icd free software
ICD loader Version 2.2.14
ICD loader Profile OpenCL 3.0
This is with the distribution’s native OpenCL ICD installed.
I’ve seen it suggested in other threads that an OS/kernel issue is suspected. However, in my recent testing, the only moving part has been Plex Media Server. I realize this isn’t conclusive, I only mention it as a data point. Complex interactions are complex, after all.
I suspect that it’s more likely an interaction between the transcoder and the Plex-included CL libraries.
Having said all that, I realize that log snippets aren’t entirely helpful on their own. I’d be happy to send full A/B testing logs to Plex staff showing a working 1.32.5.7359 environment and a non-working 1.32.6.7468 one.
Note: Both environments work with HDR tone mapping disabled (working being hardware accelerated transcoding being utilized). And both configurations are on Pop!_OS 22.04 LTS; both are running kernel version 6.4.6 (but have been tested back to 6.2.6) with the same behavior.
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