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TMPGEnc Settings (Quantize Matrix)

The Setting dialog box allows you to alter the encoder parameters. It includes the following tabs:



Quantize Matrix

Output YUV Data as basic YCbCr not CCIR601

This affects the range of values accepted for luminance and chrominance signals. YCrCb is raw samples, taking the range 0-255. In TV systems CCIR601 is normally used, which restricts the allowed range to 16-235 for luminance and 16-240 for chrominance signals. If you are mastering for TV (e.g. VCD, SVCD, DVD) then do not tick this option.

Use floating point DCT

The discrete cosine transform (DCT) is part of the encoding mechanism for compressing MPEG video. There is a floating point implementation and an integer (fixed point) implementation. The floating point DCT implementation introduces less error than the fixed point implementation, but takes longer. For Pentium-IV (SSE) systems this option is always enabled.

No motion search for still picture part by half pixel

This option prevents the encoder from looking for motion changes of half a pixel between consecutive frames. As a result, still picture video sequences may look better. This option should not be used for normal video sequences.

Soften block noise

MPEG uses blocks of 8x8 pixels to encode video sequences. Block noise is evident when the bitrate is too low to accurately encode the video. If you experiment with low bitrates you'll quickly see the effect - the picture becomes blocky. This is because high spatial frequency information is reduced. Enable this option if you are encoding at low bitrates or you see blocking artifacts in your encoded video. If you are using high bitrates and do not see block artifacts, disable this option.


Digital Video
Glossary MPEG Bitrate

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TMPGEnc
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