A COmpressor combined with a DECompressor, or encoder and a decoder , which allows you to both compress and decompress that same data.

Also known as an encoder, this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder.

Also known as compressor, this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder.

Also known as a decompressor, this is a module or algorithm to decompress data.

IMCMPEncoderOption Interface

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Interface Properties:

Type	Name	Description
long	Format	Gets or sets a value that represents the codec format. Possible values are: FORMAT_MCMP: [5] MCMP format FORMAT_LOSSLESSJPEG: [-1] Lossless JPEG FORMAT_MJPEG_411: [21] MJPEG 4:1:1 subsampling. Has a higher compression ratio than 4:2:2 and 4:4:4. FORMAT_MJPEG_422: [23] MJPEG 4:2:2 subsampling. Lower compression ratio than 4:1:1, higher compression than 4:4:4. FORMAT_MJPEG_444: [10] MJPEG 4:4:4 subsampling.
long	Quality	Gets or 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_MCMP: -9...-1 and 2...255 where negative values represent: QFACTOR_PQ1: (-1) Perfect quality option 1. QFACTOR_PQ2: (-2) Perfect quality option 2. QFACTOR_QFS: (-3) Quality far more important than size. QFACTOR_QMS: (-4) Quality more important than size. QFACTOR_QS: (-5) Quality and size are equally important. QFACTOR_SQS: (-6) Size more important than quality - Sharp. QFACTOR_SQT: (-7) Size more important than quality - Less Tilling. QFACTOR_MCQ (-8) Max Compression, keeping quality as good as possible. QFACTOR_MC: (-9) Max compression FORMAT_LOSSLESSJPEG: QFactor is ignored for lossless JPEG. FORMAT_MJPEG_411: 2...255 FORMAT_MJPEG_422: 2...255 FORMAT_MJPEG_444: 2...255
long	Flags	Gets or sets the compression flags. These flags can be OR-ed together, except for the FLAGS_INTERLEAVE_XXX flags. Only one of the interleave flags can be set. Setting FLAGS_INTERLEAVE_NEVER is equal to setting no interleave flags at all. Possible values are: FLAGS_DISABLE_ENCODER: [0x0001] Disables the MCMP/MJPEG VFW encoder. NOTE: This flag is deprecated and should not be used anymore. FLAGS_DISABLE_DECODER: [0x0002] Disables the MCMP/MJPEG VFW decoder. NOTE: If you disable the decoder, you will not be able to use it to decode MJPEG or MCMP video again until re-enabled programmatically or through a utility like GraphEdit. This flag is deprecated and should not be used anymore.. FLAGS_INTERLEAVE_NEVER: [0x0000] Save images non-interleaved. FLAGS_INTERLEAVE_288: [0x0004] Interleave images with height >= 288. FLAGS_INTERLEAVE_ALWAYS: [0x0008] Set this to save interlaced MJPG files. FLAGS_FLIP_YUV: [0x0010] Indicates how YUV video data is handled. If this flag is not set, then YUV video with a positive height value (BITMAPINFOHEADER.biHeight) 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 flag is set, 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. FLAGS_OVERRIDE_DEFAULTS: [0x0020] If this flag is set, then the defaults are overridden. FLAGS_NO_REGISTRY_SAVE: [0x0040] Do not save these settings in the registry. Set this flag if the compression is temporarily disabled because the input does not permit compression.
long	FilterState	(Read only) Gets a value that represents the state of the filter. Possible values are: FilterState_Stopped: [0] The filter is stopped. FilterState_Paused: [1] The filter is paused. FilterState_Running: [2] The filter is running.

IAMVideoCompression Interface

This is a standard DirectShow® interface. For full documentation, please refer to DirectShow® documentation.

This interface allows you to select only the quality factor for the codec. For full control over the codec settings, use the IMCMPEncoderOption interface.

Interface Properties:

Type

Name

Description

long

Quality

Gets or sets the quality factor for compression. Possible values are:

0.0...1.0: Same meaning as in DirectShow®. 1.0 is the best quality/lowest compression and 0 is lowest quality/highest compression.

Over 1.0: Lossless compression. Setting the quality factor to this value will automatically set the format to Lossless JPEG.

-9...-1: Predefined quality factor. For more information on these values, refer to IMCMPEncoderOption::QFactor. Setting the quality value to one of these values will automatically set the format to MCMP.

< -9: Undefined. Do not use.