TIEDirectShow.GetAverageTimePerFrame

Declaration

function GetAverageTimePerFrame(): Int64;

Description

Returns, when available, the average duration of each frame in 100-nanosecond units (e.g. 400000 for 25 fps). Divide by 10000 for milliseconds. Returns 0 if it is not known.

If the media type does not specify it, and the input is a file (FileInput) that is not being written to FileOutput, it is estimated by running the graph briefly. A stopped or paused graph is returned to its state and position afterwards (a running graph keeps running). This estimate is approximate.

Example

function AverageTimePerFrameForFile(const Filename: string): Int64;
var
  dshow: TIEDirectShow;
begin
  Result := -1;
  dshow := TIEDirectShow.Create();
  try
    dshow.FileInput := FileName;
    dshow.EnableSampleGrabber := True;
    dshow.Connect();
    dshow.Pause();

    dshow.TimeFormat := tfTime;
    if dshow.Duration = 0 then
      exit;
    Result := dshow.GetAverageTimePerFrame;
    dshow.Disconnect();
  finally
    FreeAndNil(dshow);
  end;
end;

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