How to get poster image (from_movie) when placing SWF file with JS?

Question

I am able to place the poster from movie (flv) file. SWF files seems to belong to Movie class. I can place the generic posters (standard, none and proxy_image), but not "FROM_MOVIE".
I am getting the following error message:
"Error 81926" "The poster image could not be changed to the requested image".
I will attach my code (sligtly modified from the sample "placeMOVIE" which is coming with CS5) containing also code for other property settings to be tested.
Hoping to find a good solution for this, thanks in advance!
Erkki
/PlaceMovie.jsx
//An InDesign CS5 JavaScript
//Shows how to import a movie  file.
main();
function main(){
    mySetup();
    mySnippet();
    myTeardown();
function mySetup(){
    var myDocument = app.documents.add();
    myDocument.viewPreferences.horizontalMeasurementUnits = MeasurementUnits.points;
    myDocument.viewPreferences.verticalMeasurementUnits = MeasurementUnits.points;
    myDocument.viewPreferences.rulerOrigin = RulerOrigin.pageOrigin;
function mySnippet(){
    var myDocument = app.documents.item(0);
    var myPage = myDocument.pages.item(0);
    //<fragment>
    //Given a page "myPage"...
    var myFrame1 = myPage.rectangles.add({geometricBounds:[72, 72, 288, 288]});
    //Import a movie file (you'll have to provide a valid file path on your system);
    var myMovie = myFrame1.place(File("~/Desktop/SWFsivut/a1.flv"))[0];
    //alert("myMovie.name: " + myMovie.name)
    //alert("myMovie.visibleBounds: " + myMovie.visibleBounds)
    var mySWF_bounds = myMovie.visibleBounds;
    myFrame1.remove();
    var myFrame2 = myPage.rectangles.add({geometricBounds:mySWF_bounds});
    var myMovie2 = myFrame2.place(File("~/Desktop/SWFsivut/01.swf"))[0];
    //alert("myMovie2.name: " + myMovie.name)
    //alert("myMovie2.constructor: " + myMovie.constructor.name)
    //alert("myMovie2.moviePosterType (DEFAULT), 1852796517 = NONE" + myMovie.moviePosterType);
    //myMovie2.moviePosterType = 1852796517; //NONE
    //alert("myMovie2.moviePosterType, 1852796517 = NONE: " + myMovie.moviePosterType);
    //myMovie2.moviePosterType = 2020623970; //STANDARD
    //alert("myMovie2.moviePosterType, 2020623970 = STANDARD: " + myMovie.moviePosterType);
    myMovie2.moviePosterType = 1298558310; //FROM_MOVIE
    //alert("myMovie2.moviePosterType, 1298558310 = FROM_MOVIE: " + myMovie.moviePosterType);
    //myMovie2.moviePosterType = 1299216505; //PROXY_IMAGE
    //Add a preview image. You'll have to provide a valid path on your system.
    //myMovie2.posterFile = "~/Desktop/SWFsivut/a1.flv"; // this path works with colons !!!!
    //myMovie2.posterFile = "EkinHD/SWFsivut/01b.jpg"; // this path dont with slahes !!!!
    //alert("myMovie2.moviePosterType, 1299216505 = PROXY_IMAGE !!!: " + myMovie.moviePosterType);
    //</fragment>
function myTeardown(){

Answer 1

... still continuation to my question...
You can put the poster for SWF using UI Media panel as shown here. So does this mean that there is a bug in a scripting environment?