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Freeware/MPEGTools/MPEGstat/Manual

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

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Filename: Freeware/MPEGTools/MPEGstat/Manual
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File contents
mpegstat - analyzes MPEG-1 encoded bitstreams

SYNOPSIS
--------

mpegstat [ -all basename ] [ -block_info filename ] [ -dct ] [ -end N ]
         [ -histogram filename ] [ -offsets filename ] [ -qscale filename ]
         [ -quiet ] [ -rate filename ] [ -ratelength N ] [ -time ]
         [ -size filename ] [ -start N ] [ -syslog filename ] [-verify ]
         [ file_name ]

DESCRIPTION
-----------

mpegstat decodes mpeg-1 encoded bitstreams collecting varying amounts of
statistics. Errors are sent to stderr, basic statistics to stdout.

The basic information is the pattern of frames used, number of bytes for
each frame type, the specified parameters, and lengths of vectors. For each
frame type, the average size, compression rate, Q-factor, and time to decode
are given.

Wherever a filename is requested - can be used to denote stdin/out.

OPTIONS
-------

-all basename

Records information from all options (qscale, block_info, etc.) into
files with basenames of basename (For wizards, -all foo -block_info bar
will record all options BUT -block_info into files of the form foo.*).

-block_info filename

Records information about every block into file filename. The format is:

frame frame# IPB-type

slice slice# q-scale

block block# IPB-type Q-scale bits block-type <vectors-if-any> <cbp>
             <dct decode>

-dct

Enables the decoded dct values to be output into the block file.

-end N

Causes mpeg_stat to finish collecting statistics at frame N.

-histogram filename

Summaries the overall statisitcs for each frame type into the file.

-offsets filename

Record the offset of every picture, GOP, and slice into file filename.

-quiet

Roggles the display of the frame-types as they are parsed (and custom
quantization matrices) [default: on].

-qscale filename

Writes Q factor and custom quantization matrix information into file
filename. The Q-factor and number of blocks of that quality (ignoring
skipped blocks) for each type of frame is recorded.

-rate filename

Record the bit rate at every picture (after the first second) into the
file filename. Also collect minimum and maximum bit rate encountered in
the summary information. (Rate is the number of bits used per second, at
every frame).

-ratelength N

Change the measurement period for rate to N, so it will measure the total
rate required over any N frame period (after the first N, of course).

-size filename

Stores information about the type (I,P,B) and size of each frame in file
filename (one frame per line).

-start N

Causes mpeg_stat to begin collecting statistics at frame N. Preceding
frames will be parsed, but few statistics are collected (the system layer
counters will sill be running).

-syslog filename

Describes the parsing of the system layer into the file filename. Note
this option is not turned on by -all.

-time 

Prints the amount of time total and per-frame type averages to decode. This
will give an estimate of time in a software player, but is not generally
useful, so it is off by default.

-verify

Does more work to check the validity of the sequence. Slows down the
statistics, so it is optional.

EXAMPLE
-------

Decoding the flowergarden sequence (mpegstat -quiet flower.mpg) should
produce the following statistics: 

mpegstat -- MPEG Analyzer for MPEG I video streams (version 2.0)

Reading flower.mpg

Frame sequence as to be displayed:

BBPBBPBBPBBPBBIBBPBBPBBPBBPBBIBBPBBPBBPBBPBBIBBPBBPBBPBBPBBIBBPBBPBBPBBPBBI
BBPBBPBBPBBPBBIBBPBBPBBPBBPBBIBBPBBPBBPBBPBBIBBPBBPBBPBBPBBIBBPBBPBBPBBPBB

Searching for constant frame type sequence...pattern detected:

IBBPBBPBBPBBPBB

SUMMARY:

Total Bytes read: 0. Total number of frames: 150. Length is 5.01 sec

Width: 352  Height: 240
Avg. Frame Size: 4786 bytes + 6 bits  (average rate 1147692.76 bits/sec)

Total Compression Rate: 1.89 % of uncompressed 24 bit images
                        =  0.45 bits per pixel

Number of Macroblocks [width * height = sum]: 22 x 15 = 330 per frame
Skipped Macroblocks = 4389 (9.46%), Coded Macroblocks = 41992 (90.54%)

Total Time Decoding: 8.611 secs. 0.05721 sec/frame or 17.11 frames/sec.

MPEG-Viewer requirements:
        Pixel aspect ratio of 0.6735
        Required display speed: 29.97 frames/sec
        Specified bit rate is 1.00 MBits/sec (2500 * 400bits/sec)
        Requested buffer size is 8K ints (16 bits).
        And the constrained parameter flag is on.
The stream meets the constrained parameter requirements.

Length of vectors in pixels:
        Horizontal forward vectors, maximum :  39       average:   6
        Vertical forward vectors, maximum   :  22       average:   1

        Horizontal backward vectors, maximum:  29       average:   5
        Vertical backward vectors, maximum  :  16       average:   1

Frame specific information:

    10  I FRAMES, average is:
        Size: 17323 bytes + 1 bits (24.13%)
        Compression Rate:  6.84%
        Q Factor [scales quantization matrix]: 11.15
        Time to Decode: 0.114039 secs.

    40  P FRAMES, average is:
        Size: 8031 bytes + 0 bits (44.74%)
        Compression Rate:  3.17%
        Q Factor [scales quantization matrix]: 10.85
        Time to Decode: 0.075342 secs.

    100 B FRAMES, average is:
        Size: 2235 bytes + 4 bits (31.13%)
        Compression Rate:  0.88%
        Q Factor [scales quantization matrix]: 15.01
        50.59% interpolated Macro Blocks
        Time to Decode: 0.044516 secs.


NOTES
-----

The analyzer expects MPEG-1 video streams only. It can handle multiplexed
MPEG streams (video+audio streams), but mostly analyzes the video portion.

Some streams do not end with the proper sequence end code and will probably
generate an "Improper sequence end code." error when done. In general
mpegstat attempts to catch and alert its user to errors in the stream. Such
errors are glossed over in mpeg_play. Be aware that errors can disturb
statistics gathering, generating odd results.

This player can handle XING data files. Be aware that XING makes no use of
temporal redundancy or motion vector information. In other words, they do
not use any P or B frames in their streams. Instead, XING data is simply a
sequence of I frames.

HISTORY
-------

The analyzer is based on the UC Berkeley mpeg_play player by Ketan Patel,
Brian Smith, Henry Chi-To Ma, and Kim Man Liu. It was modified at the
Technical University of Berlin, Germany, Dept. of Computer Science by Tom
Pfeifer, Jens Brettin, Harald Masche, Alexander Schulze, and Dirk Schubert.
It has been further modified to collect much more information by Steve Smoot
(UC Berkeley).

BUGS
----

No statistics should be collected before the start frame. Sometimes system
layer streams will indicate that they lack proper end codes, when they have
them. VBV size conformance is not checked. Verification is not complete.

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00001920  61 72 61 6c 64 20 4d 61  73 63 68 65 2c 20 41 6c  |arald Masche, Al|
00001930  65 78 61 6e 64 65 72 20  53 63 68 75 6c 7a 65 2c  |exander Schulze,|
00001940  20 61 6e 64 20 44 69 72  6b 20 53 63 68 75 62 65  | and Dirk Schube|
00001950  72 74 2e 0a 49 74 20 68  61 73 20 62 65 65 6e 20  |rt..It has been |
00001960  66 75 72 74 68 65 72 20  6d 6f 64 69 66 69 65 64  |further modified|
00001970  20 74 6f 20 63 6f 6c 6c  65 63 74 20 6d 75 63 68  | to collect much|
00001980  20 6d 6f 72 65 20 69 6e  66 6f 72 6d 61 74 69 6f  | more informatio|
00001990  6e 20 62 79 20 53 74 65  76 65 20 53 6d 6f 6f 74  |n by Steve Smoot|
000019a0  0a 28 55 43 20 42 65 72  6b 65 6c 65 79 29 2e 0a  |.(UC Berkeley)..|
000019b0  0a 42 55 47 53 0a 2d 2d  2d 2d 0a 0a 4e 6f 20 73  |.BUGS.----..No s|
000019c0  74 61 74 69 73 74 69 63  73 20 73 68 6f 75 6c 64  |tatistics should|
000019d0  20 62 65 20 63 6f 6c 6c  65 63 74 65 64 20 62 65  | be collected be|
000019e0  66 6f 72 65 20 74 68 65  20 73 74 61 72 74 20 66  |fore the start f|
000019f0  72 61 6d 65 2e 20 53 6f  6d 65 74 69 6d 65 73 20  |rame. Sometimes |
00001a00  73 79 73 74 65 6d 0a 6c  61 79 65 72 20 73 74 72  |system.layer str|
00001a10  65 61 6d 73 20 77 69 6c  6c 20 69 6e 64 69 63 61  |eams will indica|
00001a20  74 65 20 74 68 61 74 20  74 68 65 79 20 6c 61 63  |te that they lac|
00001a30  6b 20 70 72 6f 70 65 72  20 65 6e 64 20 63 6f 64  |k proper end cod|
00001a40  65 73 2c 20 77 68 65 6e  20 74 68 65 79 20 68 61  |es, when they ha|
00001a50  76 65 0a 74 68 65 6d 2e  20 56 42 56 20 73 69 7a  |ve.them. VBV siz|
00001a60  65 20 63 6f 6e 66 6f 72  6d 61 6e 63 65 20 69 73  |e conformance is|
00001a70  20 6e 6f 74 20 63 68 65  63 6b 65 64 2e 20 56 65  | not checked. Ve|
00001a80  72 69 66 69 63 61 74 69  6f 6e 20 69 73 20 6e 6f  |rification is no|
00001a90  74 20 63 6f 6d 70 6c 65  74 65 2e 0a              |t complete..|
00001a9c

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