Choppy Playback for an XVID AVI low res file

I've got two files (not HD) that both play choppy on boxee. I tried playing them on my old Xbox (first gen) that's hacked to run XBMC, runs perfect over there with a really old version of XBMC on it. File info posted here so perhaps boxee support can build in a fix.

General
Complete name : Y:\File1.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 642 MiB
Duration : 1h 24mn
Overall bit rate : 1 059 Kbps
Writing application : Lavf52.64.2

Video
ID : 0
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.0
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Codec ID : H264
Duration : 1h 24mn
Bit rate : 878 Kbps
Width : 624 pixels
Height : 352 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 29.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.138
Stream size : 556 MiB (87%)
Writing library : x264 core 100
Encoding settings : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=0 / b_bias=0 / direct=1 / weightb=0 / open_gop=0 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=878 / ratetol=9.1 / qcomp=0.60 / qpmin=6 / qpmax=51 / qpstep=4 / vbv_maxrate=10000 / vbv_bufsize=10000 / ip_ratio=1.41 / aq=1:1.00 / nal_hrd=none

Audio
ID : 1
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Codec ID : 55
Codec ID/Hint : MP3
Duration : 1h 24mn
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 77.6 MiB (12%)
Alignment : Aligned on interleaves
Interleave, duration : 26 ms (0.76 video frame)
Writing library : LAME3.98


General
Complete name : Y:\File2.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 1.46 GiB
Duration : 1h 45mn
Overall bit rate : 1 968 Kbps
Writing application : VirtualDubMod 1.6.0.0 SURROUND (build 2560/release)
Writing library : VirtualDubMod build 2560/release

Video
ID : 0
Format : MPEG-4 Visual
Format profile : Advanced Simple@L5
Format settings, BVOP : 2
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 1h 45mn
Bit rate : 1 575 Kbps
Width : 720 pixels
Height : 400 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
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.228
Stream size : 1.17 GiB (80%)
Writing library : XviD 1.2.1 (UTC 2008-12-04)

Audio
ID : 1
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Codec ID : 2000
Duration : 1h 45mn
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 291 MiB (20%)
Alignment : Split accross interleaves
Interleave, duration : 42 ms (1.00 video frame)
Interleave, preload duration : 500 ms