[Mp4-tech][H.264] PSNR is higher than JM??

Gary Sullivan garysull windows.microsoft.com
Tue Jul 18 15:03:43 EDT 2006


Fidelity is controlled by various variables referred to as QP as a
combination of syntax elements pic_init_qp_minus26, slice_qp_delta,
chroma_qp_index_offset, and mb_qp_delta.
PSNR typically has approximately a 1:1 relationship with the value of
QP.
Higher PSNR typically requires higher bit rate.  PSNR is a monotonic
function of the reciprocal of MSE.  Higher bit rate typically results in
lower MSE, and therefore in higher PSNR.  Smaller values of QP produce
smaller values of MSE and therefore higher PSNR.
SNR has similar behavior to PSNR, but depends on the overall energy of
the input video data.  Sometimes people say SNR when they mean PSNR.
Best Regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Ann
	Sent: Tuesday, July 18, 2023 3:07 AM
	To: mp4-tech lists.mpegif.org
	Subject: [Mp4-tech][H.264] PSNR is higher than JM??
	Dear experts,
	I am doing research on H.264 intra prediction. 
	And there is a strange result when doing simulation. 
	In the simulation results why the SNR values (Y, U, V) are
higher than JM software.
	Although the SNR are higher but the bit rate is more than JM.
	This is different with what I think.
	If the SNR is better than JM then bit rate should become less
compare to JM.
	But why the result is different.
	Can anyone correct me what happened here?? Or is there any
method to estimate these 2 values (SNR and bit rate).
	Thanks in advance!
	Rest regards
	Ann
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