在C＃中获取视频片段的帧速率

Question

如何在C＃中获取视频片段的帧速率？视频片段采用WMV，MP4，MPG格式。

Answer 1

您可以使用IWMPNetwork::frameRate属性来获取视频的帧速率（您需要在项目中添加Interop.WMPLib.dll.dll）。

示例代码（取自上面的链接）：

// Add a delegate for the PlayStateChange event.
player.PlayStateChange += new AxWMPLib._WMPOCXEvents_PlayStateChangeEventHandler(player_PlayStateChange);

// Create an event handler for the PlayStateChange event.
private void player_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e)
{
    // Display the frameRate when the player is playing. 
    switch (e.newState)
    {
        case 3:  // Play State = WMPLib.WMPPlayState.wmppsPlaying = 3
            if (player.network.frameRate != 0)
            {
                frameRateLabel.Text = "Current Frame Rate: " + player.network.frameRate + " K bits/second";
            }
            break;

        default:
            break;
    }
}

Answer 2

我使用here描述的代码来做到这一点，并为我提供了很多帮助。

实际上，每次打印新框架时，我都会调用以下函数：

private void FPS_Counter()
{
    _framesRendered++;
    if ((DateTime.Now - _lastTime).TotalSeconds >= 1)
    {
       Log.Debug("FPS: one second has elapsed (fps: " + _fps + ")");
       _fps = _framesRendered;
       _framesRendered = 0;
       _lastTime = DateTime.Now;
    }
}