LEAD MCMP/MJPEG Codec A COmpressor combined with a DECompressor, or encoder and a decoder, which allows you to both compress and decompress that same data.COmpressor Also known as an encoder, this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder. combined with a DECompressor, or encoder Also known as compressor, this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder. and a decoder Also known as a decompressor, this is a module or algorithm to decompress data., which allows you to both compress and decompress that same data.COmpressor combined with a DECompressor, or encoder and a decoder , which allows you to both compress and decompress that same data.COmpressor combined with a DECompressor, or encoder and a decoder , which allows you to both compress and decompress that same data.COmpressor combined with a DECompressor, or encoder and a decoder , which allows you to both compress and decompress that same data.COmpressor combined with a DECompressor, or encoder and a decoder , which allows you to both compress and decompress that same data. User Interface (2.0)

The LEAD MCMP/MJPEG Video Codec is a DirectShow Ò and Microsoft Video For WindowsÒ (VFW) filter for compressing and decompressing video data using the LEAD CMP and JPEG Joint Photographic Experts Group- commonly used method of compression for photographic images compression algorithms. The compressed video data can be stored inside AVI files, with or without the audio data.  MJPEG, which is also known as Motion JPEG, is a motion video adaptation of the JPEG standard for still photos. MJPEG treats a video stream The portion of the file holding the video data. The video data might be compressed to save disk space. The data has to be decompressed using a video decompressor before you can play (see) it. as a series of still photos, compressing each frame individually, and uses no interframe compression.

MCMP, or Motion CMP, is a motion video adaptation of LEAD's proprietary CMP compression code. MCMP delivers smaller file sizes and can maintain better image quality than MJPEG, with the same or better image quality.

High-speed compression (intraframe only), quick random access to every frame when searching, and the ability to generate a lossless stream enable this codec to be used for wide range of applications such as real time video capturing, video conferencing, remote monitoring and medical imaging. The property page is shown in the following figure:

image\MCMPCodec.jpg

Changes will be applied only when filter’s state is stopped with the ability to set them permanently by clicking Apply or OK, or abandon them by clicking Cancel. Positioning the mouse pointer over a control displays the general information for that control. The property page is shown in the following figure:

Control

Description

Encoder Settings

This group of controls provides options for controlling encoder settings.

Enable check box

Enables or disables the encoder settings

Flip YUV check box

Indicates how YUV video data is handled. If this box is clear, then YUV video with a positive height value  is handled as normal video, top side up. YUV video with a negative height value is handled as flipped video, bottom side up. If this box is selected, then YUV video with a positive height value is handled as flipped video, bottom side up, and YUV video with a negative height value is handled as normal, top side up.

Format drop-down list box

Sets the codec format. Possible values are:

 

Value

Meaning

 

LEAD Proprietary

LEAD’s MCMP format

 

Lossless JPEG

Lossless JPEG

 

JPEG 4:1:1

MJPEG 4:1:1 subsampling. Has a higher compression ratio than 4:2:2 and 4:4:4.

 

JPEG 4:2:2

MJPEG 4:2:2 subsampling. Lower compression ratio than 4:1:1, higher compression than 4:4:4.

 

JPEG 4:4:4

MJPEG 4:4:4 subsampling

Quality drop-down list box and slider bar

Sets the quality factor for compression. A QFactor of 2 has the highest quality and lowest compression ratio. As the QFactor increases, the quality decreases and the compression ratio increases. A QFactor of 255 has the lowest quality and highest compression ratio. Possible values for each format are:

 

Format

Possible values

 

LEAD Proprietary

-9...-1 and 2...255 where negative values represent:

 

 

Perfect quality option 1

 

 

Perfect quality option 2

 

 

Quality far more important than size

 

 

Quality more important than size

 

 

Quality and size are equally important

 

 

Size more important than quality - Sharp

 

 

Size more important than quality - Less Tiling

 

 

Max Compression, keeping quality as good as possible

 

 

Max compression

 

Lossless JPEG

QFactor is ignored for lossless JPEG.

 

JPEG 4:1:1

2...255

 

JPEG 4:2:2

2...255

 

JPEG 4:4:4

2...255

 

There is also a Custom selection. When this item is selected, the value can be selected by moving the slider bar or by entering a value in the edit box.

Interleave drop-down list box

Sets the interleave options.

 

Value

Meaning

 

Never

Save images non-interleaved

 

When image height greater than or equal to 288 (default)

Interleave images with height >= 288

 

Always

Save interlaced MJPG files

Decoder Settings

This group of controls provides options for controlling decoder settings.

Enable check box

Enables or disables the decoder settings