有关Microsoft MPEG-2编码器的帮助

问题描述

我正在使用Directshow开发视频捕获应用程序，并使用Microsoft MPEG-2 Encoder将捕获的视频保存在Mpeg-2中.我的应用程序如下所示:

Decklink视频捕获->

Microsoft MPEG-2编码器->文件编写器(.mpg)

Decklink音频捕获->

一切正常都可以使用编码器的默认设置，但是我想更改一些设置，例如:视频比特率，音频采样率等
我已经从MSDN阅读了有关MS MPEG-2编码器的全部信息:
http://msdn.microsoft.com/zh-CN/library/dd390678(v=VS.85).aspx，
并且我知道这些设置都可以在< b> ICodecAPI</b>中进行调整.界面，但我需要帮助，因为我不确定如何使用< b> ICodecAPI</b>在我的代码中.

有人可以帮我提供示例或示例代码的方法吗?

预先谢谢您.

Hi,
I am developing a video capture application using Directshow and saving the captured video in Mpeg-2 using Microsoft MPEG-2 Encoder.My application looks like this:

Decklink Video Capture ->

Microsoft MPEG-2 Encoder -> File Writer(.mpg)

Decklink Audio Capture ->

Everything works fine with encoder''s default settings.But I want to change some settings e.g. : video bit rate, audio sample rate, etc.
I''ve read all about MS MPEG-2 Encoder from MSDN :
http://msdn.microsoft.com/en-us/library/dd390678(v=VS.85).aspx,
and I know that these settings can all be adjusted in <b>ICodecAPI</b> interface,but I need help because I''m not sure how to use the <b>ICodecAPI</b> in my code.

Can anyone help me with example or sample code how to do that?

Thank you in advance.

推荐答案

if (m_pMpeg2Muxer)
	{
		ICodecAPI * pCodecAPI;
		if (SUCCEEDED(m_pMpeg2Muxer->QueryInterface(IID_ICodecAPI,(void**)&pCodecAPI)))
		{
			_variant_t _value;
			if (m_lVideoBitrate > 0)
			{
				_value = m_lVideoBitrate;
				if (FAILED(pCodecAPI->SetValue(&CODECAPI_AVEncCommonMeanBitRate,&_value)))
				{
					m_lVideoBitrate = 0;
				}
			}
			if (m_lVideoBitrate <= 0)
			{
				if (SUCCEEDED(pCodecAPI->GetDefaultValue(&CODECAPI_AVEncCommonMeanBitRate,&_value)))
				{
					m_lVideoBitrate = _value;
					pCodecAPI->SetValue(&CODECAPI_AVEncCommonMeanBitRate,&_value);
				}
			}
			pCodecAPI->Release();
		}
	}
	return NOERROR;

建议:如果要处理编码的所有属性，请不要使用Microsoft Mpeg-2.

问候，
音速.

Suggestions: not use the Microsoft Mpeg-2 stuff if you want to handle the all properties of encoding.

Regards,
Sonic.

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