[Mp4-tech] Poor H.264 PSNR Results with JM73

[Oztan Harmanci]

I think "mobile" stands for the name of the sequence ( the one with the
train and calendar )
I'm having similar SNR problems with 7.3 software when I turn off the RD 
optimizations. However, the problem is not bad mode/mv decisions. When 
I look at the output I see black and white spikes around 4x4 blocks. 
Decoder decodes the stream and the resulting video is the same "noisy" 
video :). Anyone else having (or had) similar problems?
Oztan
----- Original Message ----- 
From: "Gary Sullivan" <garysull windows.microsoft.com>
To: "Michael Igarta" <migarta purdue.edu>; <mp4-tech lists.mpegif.org>
Sent: Saturday, October 11, 2023 12:11 AM
Subject: RE: [Mp4-tech] Poor H.264 PSNR Results with JM73
> I think the clue here is the word "mobile".  Are you using this with
> some packet loss or data corruption?  The reference software is
> primarily intended for the error-free case.
>
> What encoders and decoders do to provide robustness to loss or
> corruption of data is outside the scope of the standard.
>
> I don't know what AHM20 is.
>
> -Gary
>
> +> -----Original Message-----
> +> From: mp4-tech-bounces lists.mpegif.org
> +> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of
> +> Michael Igarta
> +> Sent: Thursday, October 09, 2023 10:57 PM
> +> To: mp4-tech lists.mpegif.org
> +> Subject: [Mp4-tech] Poor H.264 PSNR Results with JM73
> +>
> +>
> +> Hello,
> +>
> +> I am performing some test encodes of mobile CIF (300 frames) using
> +> latest the JM 7.3 reference software.
> +> The resulting PSNR settings and visual quality seem much
> +> worse than I
> +> should be getting:
> +>
> +> I/P Frame QP=30, B Frame QP = 32: PSNR(Y) = 30.79 dB
> +> I/P Frame QP=38, B Frame QP = 40: PSNR(Y) = 25.15 dB
> +> I/P Frame QP=46, B Frame QP = 48: PSNR(Y) = 20.22 dB
> +>
> +> Using AHM20 with rate control gives me much better numbers.
> +> Can someone
> +> tell me what I am doing wrong with the
> +> constant QP?  I changed the following in the default encoder.cfg:
> +>
> +> InputFile = "mobile.cif"
> +> LastFrameNumber = 299
> +> FramesToBeEncoded = 299
> +> SourceWidth = 352
> +> SourceHeight = 288
> +>
> +>
> +> Thanks you very much for any advice.
> +>
> +>
> +>
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