You can create an application and then encounter problems after you upload it to your server.
Check that your Flash Player version is correct.
For example, if you encoded your files using On2 codec, you need Flash Player 8 or later installed for the browsers you use to view your Flash content.
Check that your server supports the FLV mime type. For more information on FLV files on a server, see Configuring your server for FLV files in Learning ActionScript 2.0 in Adobe Flash.
Check security guidelines.
If you load FLV files from another server, make sure that you have the proper files or code in place to load from that external server. For information on policy files, see Server-side policy files for permitting access to data in Learning ActionScript 2.0 in Adobe Flash. For information about loading and security, see Understanding Security in Learning ActionScript 2.0 in Adobe Flash.
Check your target paths to your video are correct. If you use relative paths (such as /video/water.flv), try using absolute paths (such as http://www.helpexamples.com/flash/video/water.flv). If your application doesn’t work as a relative path, but does work as an absolute path, correct the relative path.