MKV pixelation

[Nicely]

I'm fairly new to muxing and encoding MKVs, so I hope you can help out with a problem I have regarding some download files. I've already read that if there are too many reference frames and/or the profile is too high, it can cause image pixelation when viewed via certain players. Usually a re-encode with lower ref frames sorts the problem. I've got one particular one that won't though. It plays fine on the PC, but breaks-up on my Philips BDP7500 (which plays most MKVs). I've compared it with a similar MKV and can't work out what the difference is. Here is the MediaInfo for the files.

Plays OK
Format : Matroska
File size : 1.46 GiB
Duration : 59mn 36s
Overall bit rate : 3 500 Kbps
Encoded date : UTC 2009-12-25 19:04:21
Writing application : mkvmerge v2.9.5 ('Tu es le seul') built on Jun 17 2009 16:28:30
Writing library : libebml v0.7.8 + libmatroska v0.8.1

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Muxing mode : Container profile=Unknown@3.1
Codec ID : V_MPEG4/ISO/AVC
Duration : 59mn 36s
Bit rate : 3 046 Kbps
Nominal bit rate : 3 114 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Resolution : 8 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.132
Stream size : 1.27 GiB (87%)
Writing library : x264 core 80 r1373M 4322f63
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / psy=1 / psy_rd=1.0:0.0 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / mbaff=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=1 / wpredp=0 / keyint=250 / keyint_min=25 / scenecut=40 / rc=2pass / mbtree=0 / bitrate=3114 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00

Pixelation
Format : Matroska
File size : 1.46 GiB
Duration : 1h 4mn
Overall bit rate : 3 237 Kbps
Encoded date : UTC 2010-04-03 19:02:00
Writing application : mkvmerge v2.9.8 ('C'est le bon') built on Aug 13 2009 16:16:13
Writing library : libebml v0.7.7 + libmatroska v0.8.1

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Muxing mode : Container profile=Unknown@3.1
Codec ID : V_MPEG4/ISO/AVC
Duration : 1h 4mn
Bit rate : 2 789 Kbps
Nominal bit rate : 2 849 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Resolution : 8 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.121
Stream size : 1.26 GiB (86%)
Writing library : x264 core 84 r1416 fcf70c2
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / psy=1 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / mbaff=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / wpredb=1 / wpredp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc=2pass / mbtree=0 / bitrate=2849 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00

All suggestions received. I've run it through both UncropMKV and Handbrake, but can't fix the pixelation on the BDP7500.

[poisondeathray]

A few hardware players that contain mediatek chips cannot decode weightp properly , which is enabled in the 2nd video, which might explain what you are seeing. If you are re-encoding , make sure you disable it

--weightp 0

[Nicely]

Thanks, I'll give that a go

[Nicely]

A very quick test is looking good. I'll try a few others I've got problems with too.

[Nicely]

Yep, checked through the others I've had problems with and they all have a weightp of 1 or 2. Handbrake seems to encode with 2 by default. Did a 1-5% encode on these without weightp and no more problems. Thanks for the help

Just got to spend days re-encoding now...