LEAD MCMP/MJPEG Codec User Interface (2.0)

The LEAD MCMP/MJPEG Video Codec is a DirectShow® and Microsoft Video For Windows® (VFW) filter for compressing and decompressing video data using the LEAD CMP and JPEG 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 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 figure below:

<img src="../../resources/images/cppltfilters/mcmpcodec.jpg" alt="image\MCMPCodec.jpg" width="418" height="367" title="LEAD MCMP/MJPEG Codec User Interface (2.0)" />

Changes will be applied only when filters state is stopped with the ability to set them permanently by selecting Apply or OK, or abandon them by selecting Cancel. Positioning the mouse pointer over a control displays the general information for that control.

The following table shows the controls and their descriptions:

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 LEADs 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

 

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