audio issues on mkv's

[grambo1980]

hey guys, it's HDMI all around. So i think i got a better idea of when this happens. The one's that i've seen this happen on are the files with 2 channel audio, and then my receiver is up converting them to 5.1. So it must be something with that process that is causing the issue. The ones that have 6.1 native i do not see this issue on.
So I can't put the fault on the PCH i guess, unless anyone has any thoughts on it.


General
Unique ID : 192283188939029189565663645373275782489 (0x90A86527C37BB879AC9781F06BC33D59)
Complete name : E:\twotb\tv\The Mentalist\Season 04\The Mentalist S04E15 War of the Roses.mkv
Format : Matroska
Format version : Version 2
File size : 965 MiB
Duration : 41mn 37s
Overall bit rate : 3 242 Kbps
Encoded date : UTC 2012-02-16 20:47:14
Writing application : mkvmerge v3.1.0 ('Happy up here') built on Jan 19 2010 12:09:24
Writing library : libebml v0.7.9 + libmatroska v0.8.1

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 8 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 41mn 37s
Bit rate : 2 794 Kbps
Width : 1 280 pixels
Height : 720 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) : 0.126
Stream size : 832 MiB (86%)
Writing library : x264 core 120 r2164 da19765
Encoding settings : cabac=1 / ref=8 / deblock=1:-2:-2 / analyse=0x3:0x113 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=24 / 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 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=5 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Default : No
Forced : No

Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Codec ID : A_AC3
Duration : 41mn 37s
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 114 MiB (12%)
Default : Yes
Forced : No