Yeah the AVI is fine and has good sound before the upload...
This may help you:
General
Complete name : D:\zythyl\Videos\Games\Evidence.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 79.8 MiB
Duration : 41s 960ms
Overall bit rate : 16.0 Mbps
Writing library : VirtualDub build 30009/release
Video
Format : MPEG-4 Visual
Format profile : Streaming Video@L1
Format settings, BVOP : Yes
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default
Muxing mode : Packed bitstream
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 41s 960ms
Bit rate : 9 803 Kbps
Width : 1 680 pixels
Height : 1 050 pixels
Display aspect ratio : 1.600
Frame rate : 25.000 fps
Resolution : 24 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.222
Stream size : 49.0 MiB (61%)
Writing library : XviD 50
Audio
Format : FFFE
Codec ID : FFFE
Codec ID/Info : Extensible wave format
Codec ID/Hint : Extensible
Duration : 41s 960ms
Bit rate : 6 144 Kbps
Channel(s) : 8 channels
Sampling rate : 48.0 KHz
Resolution : 16 bits
Stream size : 30.7 MiB (38%)
Interleave, duration : 40 ms (1.01 video frame)
Interleave, preload duration : 500 ms