[Encode] Fix ACM HEVC VDENC 422 CBR/VBR #1951
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The patch is to fix ACM HEVC 422 CBR/VBR encode with gstreamer-va.
Tested with below:
gst-launch-1.0 -v filesrc location=Duck_1920x1080_3mbps_25fps_Main_at_L4.0_422.mkv ! matroskademux ! h265parse ! vah265dec ! "video/x-raw, format=YUY2" ! vah265lpenc bitrate=6000 rate-control=cbr ! filesink location=output_Duck_1920x1080_3mbps_25fps_Main_at_L4.0_422_cbr_system_memory.h265gst-launch-1.0 -v filesrc location=Duck_1920x1080_3mbps_25fps_Main_at_L4.0_422.mkv ! matroskademux ! h265parse ! vah265dec ! "video/x-raw, format=YUY2" ! vah265lpenc bitrate=6000 rate-control=vbr ! filesink location=output_Duck_1920x1080_3mbps_25fps_Main_at_L4.0_422_vbr_system_memory.h265gst-launch-1.0 -v filesrc location=Elecard2_1920x1080_4mbps_60fps_Main_at_L4.1_10bit_422.mkv ! matroskademux ! h265parse ! vah265dec ! "video/x-raw, format=Y210" ! vah265lpenc bitrate=6000 rate-control=cbr ! filesink location=output_Elecard2_1920x1080_4mbps_60fps_Main_at_L4.1_10bit_422_cbr_system_memory.h265gst-launch-1.0 -v filesrc location=Elecard2_1920x1080_4mbps_60fps_Main_at_L4.1_10bit_422.mkv ! matroskademux ! h265parse ! vah265dec ! "video/x-raw, format=Y210" ! vah265lpenc bitrate=6000 rate-control=vbr ! filesink location=output_Elecard2_1920x1080_4mbps_60fps_Main_at_L4.1_10bit_422_vbr_system_memory.h265