I need to determine if a mp4 is playing in flex

I am building a video player in Flashbuilder 4 (Flex 4.1) that supports .flv and .mp4 and need to know how to determine if an .mp4 file is playing in flex so I can have other events work off of it.
My player is of type <s:VideoDisplay id ="player"...>
Here's my code:
if (!player.playing)
togglePlayImgCanvas.visible=false;
This code works for the .flv files but for the streaming .mp4's this doesn't work. Does anyone have an idea on how I can get this working for .mp4's also?
Thanks,
Eric

Have your net status code handler check for these king of errors:
function netStatusHandler(evt:NetStatusEvent):void
    trace("net status event ", evt.info.code);
    if(evt.info.code == "NetStream.Play.FileStructureInvalid")
        trace("The MP4's file structure is invalid.");
    else if(evt.info.code == "NetStream.Play.NoSupportedTrackFound")
        trace("The MP4 doesn't contain any supported tracks");
HTH,
C

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