FFmpeg h264_nvv4l2decoder delay

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
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Hello，
I am using FFmpeg h264_nvv4l2decoder for decoding in Jetson(NVIDIA Jetson AGX Xavier, Jetpack 4.4 [L4T 32.4.3]), But there is a stable two frames delay in the beginnig, even if I added V4L2_CID_MPEG_VIDEO_DISABLE_DPB and V4L2_CID_MPEG_VIDEO_MAX_PERFORMANCE, the result is the same. But when I used CPU decoding, the delay was gone!
What can I do to eliminate the two frames delay?

THX~

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Hi,
After setting V4L2_CID_MPEG_VIDEO_DISABLE_DPB and V4L2_CID_MPEG_VIDEO_MAX_PERFORMANCE, the decoder is in low latency and run in maximum clock. This is maximum throughput and there may not have further improvement. The two-frame buffering is required for hardware decoder.

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