FLV widens subject when converted

[chrisj]

The original slim woman speaking on the video (flv) is framed by vertical black space on the left and vertical black space on the right side of the video. When it's converted to wmv or avi, the vertical black sides are gone and the video is widened to fill the player, and the subject is now very wide (distorted). How can I keep it the original way it appears when it's converted? Thanks.

[aedipuss]

use mediainfo and paste the info from the text tab here.

[chrisj]

Thanks for your reply & instructions. Here is the file text info:

General
Complete name : C:\Documents and Settings\Folder27\SV-Update May-2011.flv
Format : Flash Video
File size : 5.12 MiB
Duration : 1mn 18s
Overall bit rate : 548 Kbps
Encoded date : unknown
Tagged date : UTC 2011-06-29 07:08:53
Tagging application : Manitu Group FLV MetaData Injector 2
httphostheader : o-o.preferred.dfw06s10.v16.lscache2.c.youtube.com
Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L2.1
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Format settings, GOP : M=1, N=60
Codec ID : 7
Duration : 1mn 18s
Width : 272 pixels
Height : 480 pixels
Display aspect ratio : 0.567
Frame rate mode : Constant
Frame rate : 30.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Audio
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 10
Duration : 1mn 18s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy