Are you embedding it via HTML source view, or are you using the Media Insert feature in the WYSIWYG toolbar? A Flash 'player' is required to play .flv files. The media Insert tool adds our player to the embed code when using it to insert a Flash file.
If you're seeing the player (controls and spinning "loading" graphic in the middle) but no video, check your path to the FLV file itself. The result you're getting is typical when that path is incorrect.
When using "Media Insert", do the following:
1.) Place your cursor in the WYSIWYG where you want the media to appear,
2.) Click the "Media Insert" button on the toolbar
3.) Browse to and upload your media file, select it from the list of files displayed in the "File Browser" after it uploads, then insert it.
4.) You should see your video playing in the preview within the Media Insert dialog
5.) Click Insert (or is it "Update"?)
If you use Transcodeit.com to create your FLV from your source video (AVI/WMV/MOV/MPG/etc.), then you can use the Transcodeit player as the selection in the Media Insert drop-down menu. When I've used this process, I've always ended up with a well functioning and playing FLV video (and my Apache server is not specifically configured for streaming FLVs, they're just files that are called on the web page by the Shockwave player provided by Transcodeit)
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