Intel Quick Sync HEVC Encoding Labels P Frames as B Frames

[quamt]

Description When using Intel Quick Sync to encode HEVC video, P frames are incorrectly labelled as B. This behaviour persists across various configurations and significantly impacts the expected frame type structure in the encoded video. It appears that Low Delay B-frames (LDB) or Generalized P/B (GPB) frames are used instead of traditional P frames.

Steps to Reproduce Use Intel Quick Sync to encode a video to HEVC format. Inspect the frame types in the encoded video using tools like "ffprobe". Observe that P frames are labelled as B frames, even when the encoding configuration is set to produce P frames. Expected Behavior P frames should be correctly labelled as P frames in the encoded HEVC video.

Actual Behavior P frames are labelled as B frames, which can cause confusion and potential issues with playback and editing software that relies on correct frame type identification.

Environment CPU: Intel Core i7-1065G7 @ 1.30GHz [TB: 3.49GHz] (4C/8T) GPU: Intel Iris(R) Plus Graphics (64EU) 300-1100MHz [15W] (31.0.101.2127) Operating System: Windows 11 x64 (22631) [UTF-8] Driver Version: 31.0.101.2127 Media SDK: QuickSyncVideo API v1.35

2nd environment CPU Info 13th Gen Intel Core i5-13600 [4.71GHz] (6P+8E,14C/20T) GPU Info Intel UHD Graphics 770 (32EU) 300-1550MHz [65W] (31.0.101.5186) OS Windows 11 x64 (22631) [UTF-8] Media SDK QuickSyncVideo API v2.10

Additional Information This behaviour has been observed consistently across different videos and configurations. The issue explicitly affects iGPUs. The iGPU supports the NO GPB setting, but it is not honoured when activated.

[akwrobel]

Hi this issue should be filed in https://github.com/intel/vpl-gpu-rt/issues

[quamt]

Done. Closing. Thank you.