LEAD H264 Encoder Advanced (DMO) (4.0)

The LEAD H264 Encoder Advanced (DMO) is a DirectX Media Object (DMO) filter for compressing video data using the H.264/AVC standard. The H.264 standard is the latest video standard developed jointly by ITU and MPEG. The H.264/AVC standard provides a far more efficient algorithm for compressing video. It typically outperforms all existing standards by a factor of three to four especially in comparison to MPEG-2.

H264 is a high quality video compression algorithm suited for all types of applications with different ranges of bit rates. The compressed video data can be stored inside AVI or OGG files with the option of saving the file with or without the audio data.

The compression options for the LEAD H264 Advanced Encoder Filter (DMO) can be set manually through the property page of the LEAD H264 Encoder ( a Direct Show DirectShow A multimedia framework and API produced by Microsoft for software developers to perform various operations with media files. Most Windows video-related applications on Windows, such as Microsoft's Windows Media Player, use DirectShow to manage multimedia content.Ò filter). This is necessary because the DMO architecture does not allow the use of property pages specific to the codec.

The encoding options for both these codecs are the same as the encoding options for the LEAD H264 Encoder (DirectShow filter), except for the super compression options, which are:

• Always OFF for LEAD H264 Encoder Filter (DMO)

• Always ON for LEAD H264 Encoder Filter Advanced (DMO)

These codecs are designed to work with Microsofts Media Encoder program. This is part of the Windows Media Server technology package, which is intended to stream video over the Internet. For more information on the Windows Media Encoder, you should refer to the Microsoft documentation on MSDN at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmencode/htm/windowsmediaencoderautomation.asp.

These DMO encoders should be used with the Quality VBR encoding mode since that is what the Windows Media Encoder uses. In addition, the following encoding options of the LEAD H264 Encoder Filter need to be adjusted for the Windows Media Encoder as follows:

• Quality factor: The Microsoft Windows Media uses a quality factor that ranges from 1-100. These values are remapped since the LEAD range is from 1-50. Remapping is performed as follows:

Microsoft values 1-2 become a LEAD value of 1.

Microsoft values 3-4 become a LEAD value of 2.

Microsoft values 5-6 become a LEAD value of 3 .

Microsoft values 7-8 become a LEAD value of 4  

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Microsoft values 99-100 become a LEAD value of 50 .

• Number of Ps between 2 Is: will be overridden by the Key frame interval. This will be adjusted taking into account the number of Bs between 2 Ps. I frames will occurs after the requested number of seconds.

NOTES:

It is recommended to use the DMO encoders only with the Windows Media Encoder. For more information on the Windows Media Encoder, you should refer to the Microsoft documentation on MSDN at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmencode/htm/windowsmediaencoderautomation.asp.

Applications written with LEADTOOLS multimedia toolkit or applications that encode video using DirectShow should use the DirectShow version of the H264 codec (LEAD H264 Professional Encoder Filter).

Technical details for the filter are provided in the following table:

This filter is included as part of the following modules:

 LEAD H.264 Video Encoder Module