LEAD MPEG-2 Decoder (2.0)

The LEAD MPEG-2 Decoder Filter is a DirectShow® filter for decompressing video data that was compressed using the MPEG-2 (ISO/IEC 13818-2) or MPEG-1 (ISO 11172-2) standard. For more information on the MPEG-2 compression algorithm, refer to LEAD MPEG-2 Encoder Filter.

The LEAD MPEG-2 Decoder is capable of decoding all profiles, including the High Profile with the 4:2:2 Chroma format.

The LEAD MPEG-2 Decoder is also capable of parsing Closed Captioning data embedded inside the mpeg2 video stream, in accordance with the ANSI/CEA-608-E and CEA-708-D standards. The decoder has two output pins: one for uncompressed video and the other for Closed Captioning data. To render the closed captioning pin, use the Line21 decoder filter which is shipped with the Windows OS. To display Closed Captioning data, connect to a Line 21 Decoder Filter which is in turn connected to the video renderer. Only those mpeg2 video streams having Closed Captioning data output Closed Captioning data.

For more details regarding decoding Close Captioning data, search for the "Line 21 Decoder Filter" topic on msdn.

The decoder can use Intel Quick Sync Video hardware acceleration for compression once the libmfxsw32/64.dll is installed properly. For more information, refer to How to Enable High Profiles and Hardware Compression in the LEAD H.264 Encoder.

The decoder can use NVIDIA CUDA hardware acceleration on computers with NVIDIA graphics cards with CUDA capabilities. You do not need to install anything; hardware acceleration will be used automatically if possible. For more information, refer to Using H264 Encoder on NVIDIA GPUs.

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

Filter Interfaces

ILMMPEG2Decoder

Interface ID

IID_ILMMPEG2Decoder

Input Media Types

Type:
MEDIATYPE_Video
Subtypes:
MEDIASUBTYPE_MPEG2_VIDEO
MEDIASUBTYPE_LMPG2

Output Media Types

Type:
MEDIATYPE_Video
Subtype:
MEDIASUBTYPE_YV12
MEDIASUBTYPE_YUY2
MEDIASUBTYPE_UYVY
MEDIASUBTYPE_RGB32
MEDIASUBTYPE_RGB24
MEDIASUBTYPE_RGB565
MEDIASUBTYPE_RGB555

Depends on the mpeg2 video elementary stream being decoded. The decoder can parse a closed captioning stream:

Type:

MEDIATYPE_AUXLine21Data

Subtypes:

MEDIASUBTYPE_Line21_BytePair

Filter CLSID

CLSID_LMMPEG2Decoder

Property Page CLSID

CLSID_LMMPEG2DecoderProperty

Executable

LDecMpg22.dll,

DSKernel2.dll

Filter category

CLSID_LegacyAmFilterCategory

Header

ILDecMPEG2.h

Platforms

Win32, x64, Mobile

This filter is included as part of the following modules:

LEAD MPEG-2 Video Decoder Module

LEAD MPEG-2 Video Encoder Module

LEAD MPEG-2 Video Codec Module

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