[M4IF Technotes] 1MV/4MV comparisons

[Ramkishor Korada]

MessageHi Jwalant,
    4MV is going to be useful when local motion exists with in a 16x16 macroblock.The performance gains are depending on the decision making involved. Gains in the range of 0.1 to 0.3 dB can be expected.
regards,
ramkishor
Architect - Video
Multimedia Technologies Division
Emuzed India
Bangalore
www.emuzed.com
----- Original Message ----- 
  From: Jwalant Desai 
  To: technotes   lists.m4if.org 
  Sent: Monday, June 16, 2023 12:35 PM
  Subject: [M4IF Technotes] 1MV/4MV comparisons
  Hi all,
  Does anyone have statistical data on how much PSNR improvement (for the same target bitrate) can be achieved if we use 4 MV instead of 1MV in MPEG-4 simple profile encoding? I am looking for data such as:
  1. All macroblocks encoded with 1 MV : xxx dB PSNR
  2. All macroblocks encoded with 4 MV : yyy dB PSNR
  3. Encoding with dynamic switch between 1 MV and 4 MV (based on complexity of the macroblock) : zzz dB PSNR
  It is assumed that all other parameters are same. 
  In case statistical data is not available, any other qualitative comments are also welcome. My related question is: Under what situation, is it better to implement 4 MV as compared to 1 MV?
  Best regards
  Jwalant
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