Using DSPack, SetPosition plays the entire clip. Correct usage?

[Raymond Kennington]

A clip (QuickTime .MOV) was displayed initially using:

QueryInterface(IID_IMediaSeeking, MediaSeeking);

with MediaSeeking do
begin
SetTimeFormat(TIME_FORMAT_MEDIA_TIME);

GetAvailable(EarliestPos, LatestPos);

ShowMessage( 'Earliest Pos: ' + IntToStr(EarliestPos) + #13#10
+ 'Latest Pos: ' + IntToStr(LatestPos));

// Earliest: 0
// Latest : 7 660 000

StartPos := EarliestPos;
StopPos := LatestPos;

MediaSeeking.SetPositions(StartPos,AM_SEEKING_AbsolutePositioning,
StopPos, AM_SEEKING_AbsolutePositioning);
end;

Play();

The following code is an attempt to send the clip back to the beginning:

procedure TSearchForm.ToBeginningBtnClick(Sender: TObject);
begin
DisplayFilterGraph.Active := True;

with MediaSeeking do
begin
case SetPositions(EarliestPos, AM_SEEKING_AbsolutePositioning,
EarliestPos, AM_SEEKING_AbsolutePositioning) of

S_FALSE: ShowMessage('No position change. (Both flags specify no
seeking.)');
S_OK: ; // ShowMessage('Success.');
E_INVALIDARG: ShowMessage('Invalid argument.');
E_NOTIMPL: ShowMessage('Method is not supported.');
E_POINTER: ShowMessage('NULL pointer argument.');
end;
end;
end;

However, the entire clip is played.

What is the correct way of setting the absolute positions?

Thanks.
Raymond.

[Raymond Kennington]

Further information:

The return result of SetPositions is that of FALSE, namely no seeking
took place.

I have installed the klcodec codecs (using the default install).

Raymond.