Thanks for the reply. Here is what MediaInfo says:
General
Complete name : /Users/Nick/Movies/Films/Superbad (2007)/Superbad (2007).mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 4.00 GiB
Duration : 1h 58mn
Overall bit rate mode : Variable
Overall bit rate : 4 824 Kbps
Encoded date : UTC 2012-01-09 08:13:27
Tagged date : UTC 2012-01-09 14:39:16
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile :
[email protected]
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1h 58mn
Bit rate mode : Variable
Bit rate : 4 373 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 23.976 fps
Minimum frame rate : 23.974 fps
Maximum frame rate : 23.981 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.088
Stream size : 3.62 GiB (91%)
Writing library : x264 core
Encoded date : UTC 2012-01-09 08:13:27
Tagged date : UTC 2012-01-09 14:38:33
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
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 : 1h 58mn
Bit rate mode : Variable
Bit rate : 448 Kbps
Maximum bit rate : 597 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 380 MiB (9%)
Encoded date : UTC 2012-01-09 08:13:27
Tagged date : UTC 2012-01-09 14:38:32
Hope this helps. It also stutters a very small amount (for about half a second) when first opening in VLC but then after that is completely fine.