Flash Media Interactive Server 3.5 does not play video

Flash Media Interactive Server 3.5 (https://www.adobe.com/de/products/flashmediaserver/) unusually did not play .flv video. This video was placed in the application directory because of use of server-side actionscript.

There was an error message concerning getStreamlength which was solved by the following lines of code in main.asc:

p_client.getStreamLength = function( streamName ) {

trace(„length is “ + Stream.length( streamName ));
return Stream.length( streamName );

}

This, however, did not solve the problem.

I opened the video with avidemux (http://fixounet.free.fr/avidemux/), saved the video and this was it.