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1992-12-11
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MPEG_PLAY(1) MPEG_PLAY(1)
NAME
mpeg_play - plays mpeg1 encoded bitstreams using X11
SYNOPSIS
mpeg_play [ nob ] [ nop ] [ dither dither_option ] [
loop ] [ eachstat ] file_name
DESCRIPTION
mpeg_play decodes and displays mpeg1 encoded bitstreams
on systems running X11. The player will create a new win
dow, display the bitstream, and exit. Any error messages
or notices are sent to stderr.
OPTIONS
nob : causes the player to ignore and not display any B
frames.
nop : causes the player to ignore and not display any P
frames.
dither dither_option : selects from a variety of dither
options. The possible values are:
ordered ordered dither. This is the default.
fs4 FloydSteinberg dithering with 4 error values
propogated.
fs2 FloydSteinberg dithering with 2 error values
propogated.
fs2fast Fast FloydSteinberg dithering with 2
error values propogated.
hybrid Hybrid dithering, a combination of ordered
dithering for the luminance channel and
FloydSteinberg 2 error dithering for the
chrominance channels. Errors are NOT pro
pogated properly and are dropped all
togethor every two pixels in either direc
tion.
hybrid2 Hybrid dithering as above, but with error
propogation among pixels.
2x2 A dithering technique using a 2x2 pixel area
for each pixel. The image displayed is 4
times larger than the original image
encoded. Random error terms are added to
each pixel to break up contours and gradi
ents.
gray Grayscale dithering. The image is dithered
into 128 grayscales. Chrominance information
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MPEG_PLAY(1) MPEG_PLAY(1)
is thrown away.
color Full color display (only available on 24
bit color displays).
none no dithering is done, no image is displayed.
Used to time decoding process.
mono FloydSteinberg dithering for monochrome
displays.
threshold Floydsimple dithering for monochrome
displays.
loop : makes the player loop back to the beginning after
reaching the end.
eachstat : causes statistics to be displayed after each
frame. Only valid when compiled with DANALYSIS.
shmem_off : turns shared memory off.
NOTES
The player expects MPEG1 video streams only. It can not
handle multiplexed MPEG streams or video+audio streams.
The player uses the paris entropy coding table set (which
we believe to be the MPEG1 standard), but can not handle
any bitstreams that use the "berlin" entropy coding table
set. Berlin data is relatively rare so there shouldn't be
too much to worry about here, but be aware of the differ
ence when looking for streams to play.
Most streams do not end with the proper sequence end code
and will probably generate an "Unexpected EOF" error when
done playing.
This player can play 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. Since I frames take significantly
longer to decode, performance of the player using XING
data is not representative of the player's ability.
AUTHORS
Ketan Patel University of California, Berkeley, kpa
tel@cs.berkeley.edu
Brian Smith University of California, Berkeley,
bsmith@cs.berkeley.edu
Henry ChiTo Ma University of California, Berkeley,
cma@cs.berkeley.edu
30 November 1992 2
MPEG_PLAY(1) MPEG_PLAY(1)
Kim Man Liu University of California, Berkeley,
kliu@cs.berkeley.edu
30 November 1992 3