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

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2 total messages Started by Raymond Kennington Wed, 16 Jul 2008 03:01

#214

Author: Raymond Kennington
Date: Wed, 16 Jul 2008 03:01

53 lines
2311 bytes

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.

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

#215

Author: Raymond Kennington
Date: Wed, 16 Jul 2008 03:33

8 lines
1132 bytes

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.

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