Playback Stutters or freezes with certain files

Ok, thanks for that.

I tried a friends copy of Avatar 3D, I am still to purchase a blu ray player, and this also had stuttering issues, picture break up.

Here is the mediainfo output of that:

General
Unique ID : 250171347975580272115870078773781347248 (0xBC353FC063D921229B6E2D24C5C43BB0)
Complete name : D:\jmacey\My Videos\Avatar.2010.3D.mkv
Format : Matroska
Format version : Version 2
File size : 19.8 GiB
Duration : 2h 41mn
Overall bit rate mode : Variable
Overall bit rate : 17.5 Mbps
Encoded date : UTC 2011-09-21 14:59:05
Writing application : mkvmerge v4.6.0 (‘Still Crazy After All These Years’) built on Mar 10 2011 02:50:32
Writing library : libebml v1.2.0 + libmatroska v1.1.0

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Muxing mode : Header stripping
Codec ID : V_MPEG4/ISO/AVC
Duration : 2h 41mn
Bit rate : 15.6 Mbps
Nominal bit rate : 13.2 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.314
Stream size : 17.6 GiB (89%)
Writing library : x264 core 116 r2074 2641b9e
Encoding settings : cabac=1 / ref=4 / deblock=1:-1:-1 / analyse=0x3:0x113 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=48 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=8 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=13223 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=50000 / vbv_bufsize=50000 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Language : English
Default : Yes
Forced : No

Audio
ID : 2
Format : DTS
Format/Info : Digital Theater Systems
Format profile : MA / Core
Muxing mode : Header stripping
Codec ID : A_DTS
Duration : 2h 41mn
Bit rate mode : Variable
Bit rate : 1 561 Kbps / 1 510 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Compression mode : Lossless / Lossy
Language : English
Default : Yes
Forced : No

Text #1
ID : 3
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : The same subtitle format used on BDs/HD-DVDs
Language : English
Default : Yes
Forced : No

Text #2
ID : 4
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : The same subtitle format used on BDs/HD-DVDs
Language : French
Default : No
Forced : No

Text #3
ID : 5
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : The same subtitle format used on BDs/HD-DVDs
Language : German
Default : No
Forced : No

Text #4
ID : 6
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : The same subtitle format used on BDs/HD-DVDs
Language : Italian
Default : No
Forced : No

Text #5
ID : 7
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : The same subtitle format used on BDs/HD-DVDs
Language : Dutch
Default : No
Forced : No

Text #6
ID : 8
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : The same subtitle format used on BDs/HD-DVDs
Language : Turkish
Default : No
Forced : No

Text #7
ID : 9
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : The same subtitle format used on BDs/HD-DVDs
Language : English
Default : No
Forced : No

Menu
00:00:00.000 : en:00:00:00.000
00:00:23.232 : en:00:00:23.232
00:02:47.667 : en:00:02:47.667
00:06:17.961 : en:00:06:17.961
00:07:53.598 : en:00:07:53.598
00:12:04.891 : en:00:12:04.891
00:14:00.465 : en:00:14:00.465
00:17:01.479 : en:00:17:01.479
00:20:00.574 : en:00:20:00.574
00:24:00.230 : en:00:24:00.230
00:26:53.278 : en:00:26:53.278
00:31:41.900 : en:00:31:41.900
00:33:33.428 : en:00:33:33.428
00:35:43.850 : en:00:35:43.850
00:40:07.822 : en:00:40:07.822
00:43:31.859 : en:00:43:31.859
00:48:18.896 : en:00:48:18.896
00:49:23.627 : en:00:49:23.627
00:51:52.609 : en:00:51:52.609
00:54:29.975 : en:00:54:29.975
00:58:54.698 : en:00:58:54.698
00:59:56.051 : en:00:59:56.051
01:02:01.634 : en:01:02:01.634
01:05:10.198 : en:01:05:10.198
01:07:42.433 : en:01:07:42.433
01:11:36.417 : en:01:11:36.417
01:15:11.006 : en:01:15:11.006
01:17:51.625 : en:01:17:51.625
01:20:29.116 : en:01:20:29.116
01:24:41.910 : en:01:24:41.910
01:29:40.583 : en:01:29:40.583
01:32:12.819 : en:01:32:12.819
01:36:04.801 : en:01:36:04.801
01:37:55.786 : en:01:37:55.786
01:41:37.341 : en:01:41:37.341
01:44:33.100 : en:01:44:33.100
01:48:15.489 : en:01:48:15.489
01:51:28.974 : en:01:51:28.974
01:53:53.868 : en:01:53:53.868
01:55:32.759 : en:01:55:32.759
01:58:38.820 : en:01:58:38.820
02:02:05.568 : en:02:02:05.568
02:05:33.859 : en:02:05:33.859
02:10:01.835 : en:02:10:01.835
02:12:53.382 : en:02:12:53.382
02:16:07.284 : en:02:16:07.284
02:19:50.841 : en:02:19:50.841
02:23:00.655 : en:02:23:00.655
02:25:50.325 : en:02:25:50.325
02:28:37.492 : en:02:28:37.492
02:31:14.065 : en:02:31:14.065
02:35:05.296 : en:02:35:05.296
02:36:43.018 : en:02:36:43.018

So I know for the future, what information do you go to in the output to try and determine the problem?

Format profile : High@L4.1 which is better than the LG demo…