PowerDVD shows artifacts on 1080i x264 stream

[pyrisurfer]

I'm trying to create a Blu-ray compatible 1080i (1440*1080) stream with x264. So far, my command line looks like this:

x264 --preset slower --bitrate 11000 --profile high --bluray-compat --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --ref 4 --b-frames 3--keyint 25 --slices 4 --open-gop --tff --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 4:3

But when i play it in PowerDVD 9, it shows these weird blocking artifacts: Image
They just appear for about 1 frame and then disappear again. They don't show up all the time but are especially noticable on pans and other movements where they appear around edges.

This is appearently only the case on the PowerDVD Software decoder, when i enable hardware decoding or play the file in VLC, no such artifact are visible.
But since i want to have maximum compatibility, this is still a problem. And maybe if this decoders has problems with the stream, another will too.

I've already tried disabling open-gop and weightb but it didn't help.

MediaInfo shows the following on the problematic stream (the one where i already disbled open-gop and weightb):

General
ID                                       : 1 (0x1)
Complete name                            : E:\BluRay\Tests\1080i AVC\BD3\BDMV\STREAM\00000.m2ts
Format                                   : BDAV
Format/Info                              : Blu-ray Video
File size                                : 402 MiB
Duration                                 : 4mn 45s
Overall bit rate mode                    : Variable
Overall bit rate                         : 11.8 Mbps
Maximum Overall bit rate                 : 35.5 Mbps

Video
ID                                       : 4113 (0x1011)
Menu ID                                  : 1 (0x1)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 3 frames
Codec ID                                 : 27
Duration                                 : 4mn 45s
Bit rate mode                            : Variable
Bit rate                                 : 11.0 Mbps
Maximum bit rate                         : 40.0 Mbps
Width                                    : 1 440 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 25.000 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : MBAFF
Bits/(Pixel*Frame)                       : 0.283
Stream size                              : 377 MiB (94%)
Writing library                          : x264 core 125 r2208 d9d2288
Encoding settings                        : cabac=1 / ref=4 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / slices=4 / nr=0 / decimate=1 / interlaced=tff / bluray_compat=1 / constrained_intra=0 / bframes=3 / b_pyramid=1 / b_adapt=2 / b_bias=0 / direct=3 / weightb=0 / open_gop=0 / weightp=0 / keyint=25 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=25 / rc=2pass / mbtree=1 / bitrate=11000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=40000 / vbv_bufsize=30000 / nal_hrd=vbr / ip_ratio=1.40 / aq=1:1.00
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Mode extension                           : CM (complete main)
Format settings, Endianness              : Big
Codec ID                                 : 129
Duration                                 : 4mn 45s
Bit rate mode                            : Constant
Bit rate                                 : 256 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 8.70 MiB (2%)

So do you have any suggestions what i need to change in my command line?

[pyrisurfer]

I think I found the error myself now. --direct needs to be set to spatial.
Is that part of the Blu-ray specifications or just an error in the Cyberlink AVC decoder?