[Mp4-tech] Frext configurations -GOP structure help

[Tourapis, Alexis]

Dear Prasanth,
The FramesToBeEncoded parameter represents only the I and P frames
(assuming no hierarchical structures are used) in your stream. Please
check JVT-Q042. This means that you have to change this value to be
equal to:
FramesToBeEncoded = int((TotalNumberOfFrames-1)/(NumberBFrames +  1)) +
1=int((499-1)/(2+1))+1=167
You may also use the parameter LastFrameNumber, but that still has some
issues with certain GOP types (I have not found the time to update this
in case hierarchical structures are used. The simple trick would be to
adjust/adapt the hierarchy if fewer frames remain than originally
expected).
Best regards,
Alexis
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From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Prasanth
Sent: Tuesday, January 31, 2024 10:47 PM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] Frext configurations -GOP structure help
Hi experts,
 I am working with JM 10.1 and trying to produce a GOP structure of 
 IPBBPBBPBBI IBBPBBPBBPBBI IBBPBBPBBPBBI ..<repeat> ..
 (GOP size=12 )
In the High_quality config file supplied I am using
StartFrame            = 0      # Start frame for encoding. (0-N)
FramesToBeEncoded     = 499     # Number of frames to be coded
FrameRate             = 30.0   # Frame Rate per second (0.1-100.0)
IntraPeriod           =  4  # Period of I-Frames (0=only first)
IDRIntraEnable        =  0  # Force IDR Intra  (0=disable 1=enable)
FrameSkip             =  2  # Number of frames to be skipped in input 
NumberBFrames         =  2  # Number of B coded frames inserted (0=not
used)  
Interlaced=0 (non interlaced)
I am getting 1495 frames( 0-1494) why is this...? whats the relation
between all this that yields there mayn number of frames when I just set
499.
 can anyone help?
thanks
Prasanth
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