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Add following V4L2 QP parameters for H.264: * V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP * V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP * V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP * V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP These controls will limit QP range for intra and inter frame, provide more manual control to improve video encode quality. Signed-off-by: Fish Lin <linfish@google.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>