Here is one example file of a mp4 that audio is out of sync if someone wants to check it out. The name of the file is: American.Idol.S11E22.HDTV.x264-MOMENTUM

I will not post a link to the file here as I am not sure if I can. But if you search for it online you will find it. Here is the info from the video file. Once again this file plays fine in mplayer ce on my wii.

Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 380 MiB
Duration : 41mn 26s
Overall bit rate mode : Variable
Overall bit rate : 1 283 Kbps
Encoded date : UTC 2012-03-23 04:15:50
Tagged date : UTC 2012-03-23 04:15:50

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : [email protected]
Format settings, CABAC : Yes
Format settings, ReFrames : 5 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 41mn 26s
Bit rate : 1 147 Kbps
Maximum bit rate : 5 719 Kbps
Width : 720 pixels
Height : 404 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.132
Stream size : 340 MiB (89%)
Writing library : x264 core 122 r2184 5c85e0a
Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / 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=16 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=300 / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2012-03-23 04:15:50
Tagged date : UTC 2012-03-23 04:15:58
Matrix coefficients : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 41mn 26s
Bit rate mode : Variable
Bit rate : 132 Kbps
Maximum bit rate : 152 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 39.1 MiB (10%)
Encoded date : UTC 2012-03-23 04:15:55
Tagged date : UTC 2012-03-23 04:15:58

@jhb50 wrote:

Any video wider than 640 pixels may be beyond the ability of the WII to decode it. This file is an example of that. The audio plays in real time but the video lags, causing the audio to be out of sync.

Then why does the video play just fine when I play it on my wii using mplayer ce? Both of the above referenced files I mention play fine in Mplayer CE on my Wii. Wimmc on the other hand the audio is out of sync. Also I failed to mention this before but at times the audio will be in sync for a bit in the mentioned mp4 files and then suddenly go out of sync. Then it will go back in sync for a bit. Then back out of sync. Its kind of back and forth. This is not an issue when I use mplayer CE. Maybe I am the only one having this issue? I hope this can possibly be figured out. Anything I can do to help figure it out let me know.

@jhb50 wrote:

That’s a good question and maybe one that Tantric can explain. Do you know what version/level of MPlayer your CE is at? WIIMC is at the latest levels so perhaps there has been some regression. I too would expect them to play the same file succesfully. I’ve tried to play your file with some older versions and they either hangup or have the same problem.

I am using Mplayer CE Release 658 which is the last one that was released (which was 2011). It can be downloaded here: https://code.google.com/p/mplayer-ce/downloads/list
I am using the latest verison of WiiMC 1.2.4 and it has the same issue. I am glad you experienced the same issue I did. Hopefully someone can figure out why this is happening.