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Global Motion Compensation in MPEG4

jburford1
Beginner
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Hello.

After looking at the MPEG4 encoder and decoder code, it looks like there might be some support for Global Motion Compensation (GMC). Does anyone know if/how it works?

Thanks!
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Vladimir_Dudnik
Employee
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Hello,

as you can see in mpeg4 decoder and encoder readme files:

The decoder supports the standard ISO/IEC 14496-2 with certain restrictions. Only the following features are supported in the current version:

  • I-VOP

  • P-VOP

  • B-VOP
  • S-VOP
  • AC/DC Prediction

  • 4MV

  • Un-restricted MV

  • P-VOP with OBMC

  • Quantisation Method 1,2

  • Videopackets

  • Short video header

  • Data partitioning
  • Reversible VLC
  • Basic sprites
  • Interlacing
  • Quarter-Pixel Motion Compensation
  • Global Motion Compensation

The encoder supports the standard ISO/IEC 14496-2 with certain restrictions. Only the following features are supported in the current version:

  • I-VOP

  • P-VOP

  • B-VOP
  • S-VOP
  • AC/DC Prediction

  • 4MV

  • Un-restricted MV

  • P-VOP with OBMC

  • Quantisation Method 1,2

  • Videopackets

  • Short video header

  • Data partitioning
  • Reversible VLC
  • Interlacing
  • Basic sprites
  • Quarter-Pixel Motion Estimation
  • Global Motion Estimation
  • VBR and CBR Control

Regards,
Vladimir

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