Note - just to be clear - the following file plays flawlessly on the old WD live box (I have just played it once again to verify) - fyi the old box is running SW 1.06.15V, no delays/sync issues whatsoever.
I then remove the old WD live box and put the V2 box in - same power, HDMI and network connection. The new box then starts playing the file (audio and video), but the video is slightly jerky (degraded frame rate) and the audio gets out of sync quite quickly. After about 30 seconds the video continues but the sound is gone.
Should also add - I have also now tried playing the file from a USB stick (as opposed to network streaming) on the new V2 WD Live box - same result as net streaming result above so it looks like a straight MP4 decode issue…
Mediainfo for the file is as follows -
General
Complete name : Z:\Videos\2011campdraftHD.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 169 MiB
Duration : 4mn 49s
Overall bit rate mode : Variable
Overall bit rate : 4 895 Kbps
Writing application : Lavf52.78.1
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.2
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 4mn 49s
Bit rate : 4 900 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 50.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.047
Stream size : 163 MiB (97%)
Writing library : x264 core 98 r1629 9d1c441
Encoding settings : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=4 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=16 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=cbr / mbtree=1 / bitrate=4900 / ratetol=0.8 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / vbv_maxrate=4900 / vbv_bufsize=4900 / ip_ratio=1.41 / aq=1:1.00 / nal_hrd=none
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 4mn 49s
Bit rate mode : Variable
Bit rate : 152 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 5.24 MiB (3%)