[Mp4-tech] Fwd: About H.264,what does the total bits mean???

Thu Feb 3 21:16:13 ESTEDT 2005

Dear Judy,
I would suggest checking the H.264 reference software manual for information
about the software. You can download the latest version from this link:
ftp://standards.polycom.com/imtc_jvtexperts/2005_01_HongKong/JVT-N008r1.doc
I believe you will find most of the information about what you are asking in
this document.
LeakyBucketRate relates to HRD (Hypothetical Reference Decoder) behavior.
See Annex C of the latest spec if you are interested, although I do not
think you should concern yourself with this if you are just starting with
the encoder. Basically this relates to Rate Control Design, and conformance
to certain standard constraints.
The FrameSkip parameter basically affects the distance between I and P coded
frames (or field pairs) in the encoder (if we ignore the concept of
“pyramid coding”). For example, setting this parameter to 1 (which I am
guessing might be your case) would result in frames coded as follows :
I0-P2-P4-P6….
However, if you set this parameter to a value (i.e. 1) and also set the
parameter NumberBFrames to an equal or smaller value, you are also enabling
B coded frames in-between the above “layer”.  i.e. setting both to 1, will
result to coding order I0-P2-B1-P4-B3-P6-B5-P8….
I hope this info helps.
Best regards,
Alexis
  _____
From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of ??
Sent: Wednesday, February 02, 2024 10:48 PM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] Fwd: About H.264,what does the total bits mean???
Dear alI:
  I use JM to encode Akiyo.After encoding,at the dos window,there are many
information about encoding process,for example the sequence type, QP
value,and so on.Could you tell me what does it mean especially the
LeakyBucketRate,Freq. for encoded bitstream,and the total bits.
  And some questions in the encoder.cfg.When I encode Akiyo 30 frames,it
encodes 60 frames,does it have any relationship with Frame skip? What does
Frame skip means?
Thanks a lot.
Best Regards.
Judy
  _____
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<http://tw.rd.yahoo.com/referurl/mail/welcome/line1/evt=30131/*http:/tw.prom
o.yahoo.com/2004charity/index.html> 馬上參加0037(P) 1120 28
0276(P) 832 28 39.1202 40.9475 41.9621 4078 FRM 0
0277(P) 704 28 38.9296 40.8728 41.9176 3953 FRM 0
0278(P) 1144 28 38.8463 40.9947 41.9421 4157 FRM 0
0279(P) 1096 28 38.8199 40.8411 41.9178 3922 FRM 0
0280(P) 848 28 38.6968 40.6663 42.0139 3922 FRM 0
0281(P) 992 28 38.7785 40.6535 41.9724 3969 FRM 0
0282(P) 784 28 38.7830 40.6744 41.9217 4078 FRM 0
0283(P) 568 28 38.7038 40.6703 41.8975 4359 FRM 0
0284(P) 840 28 38.7309 40.7586 41.9326 4047 FRM 0
0285(P) 616 28 38.6801 40.8004 41.8795 4484 FRM 0
0286(P) 976 28 38.7767 40.8337 41.9006 4438 FRM 0
0287(P) 576 28 38.7445 40.8368 41.8770 4094 FRM 0
0288(P) 616 28 38.8122 40.8876 41.8678 4187 FRM 0
0289(P) 504 28 38.7476 40.9292 41.8705 4328 FRM 0
0290(P) 704 28 38.8452 40.! 8938 41.8663 4125 FRM 0
0291(P) 456 28 38.8353 40.9190 41.8933 4437 FRM 0
0292(P) 536 28 38.8400 40.8977 41.8954 4157 FRM 0
0293(P) 464 28 38.8407 40.9917 41.8723 3891 FRM 0
0294(P) 608 28 38.8401 40.9737 41.8936 4000 FRM 0
0295(P) 792 28 38.8288 40.9244 41.9000 4031 FRM 0
0296(P) 736 28 38.8471 40.9107 41.8817 4110 FRM 0
0297(P) 360 28 38.7614 40.8684 41.9070 4359 FRM 0
0298(P) 496 28 38.8802 40.8608 41.9165 4109 FRM 0
--------------------------------------------------------------------------
Total Frames: 299 (299)
LeakyBucketRate File does not exist; using rate calculated from avg. rate
Number Leaky Buckets: 8
Rmin Bmin Fmin
35280 23640 20504
44100 17880 17672
52920 17880 17672
61740 17880 17672
70560 17880 17672
79380 17880 17672
88200 17880 17672
97020 17880 17672
--------------------------------------------------------------------------
Freq. for encoded bitstream : 30
Hadamard transform : Used
Imag! e format : 176x144
Error robustness : Off
Search range : 16
No of ref. frames used in P pred : 5
Total encoding time for the seq. : 1213.193 sec
Sequence type : IPPP (QP: I 28, P 28)
Entropy coding method : CAVLC
Search range restrictions : none
RD-optimized mode decision : used
Data Partitioning Mode : 1 partition
Output File Format : H.26L Bit Stream File Format
------------------ Average data all frames ------------------------------
SNR Y(dB) : 38.79
SNR U(dB) : 40.90
SNR V(dB) : 41.86
Total bits : 351744 (I 17672, P 334072)
Bit rate (kbit/s) @ 30.00 Hz : 35.29
Bits to avoid Startcode Emulation : 0
Bits for parameter sets : 168
--------------------------------------------------------------------------
Exit JM 8 encoder ver 8.2
Press any key to continue
  _____
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