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- MPEG_PLAY(1) USER COMMANDS MPEG_PLAY(1)
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- NAME
- mpeg_play - plays mpeg-1 encoded bitstreams using X11
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- SYNOPSIS
- mpeg_play [ -nob ] [ -nop ] [ [ -display display_name ] [ -
- quality [on|off] ] [ -dither dither_option ] [ -loop ] [ -
- eachstat ] [ -seek offset ] [ -start num ] [ -end num ] [ -
- gamma gamma_correction_value ] [ -framerate num ] [ -
- no_display ] [ -shmem_off ] [ -l_range num ] [ -cr_range num
- ] [ -cb_range num ] [ -quiet ] file_name
-
- DESCRIPTION
- mpeg_play decodes and displays mpeg-1 encoded bitstreams on
- systems running X11. The player will create a new window,
- 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.
-
- -display display_name : causes the player to open the window
- on the display _d_i_s_p_l_a_y__n_a_m_e.
-
- -quality [on|off] : forces player to choose output quality
- over speed when on, and vice versa when off. When
- quality is on, the player uses a computationally expen-
- sive IDCT and also improves playback through improved
- handling of half pixel motion vectors. The default can
- be set to on if you compile mpeg_play with the flag
- -DQUALITY.
-
- -dither dither_option : selects from a variety of dither
- options. The possible values are:
-
- ordered - ordered dither.
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- ordered2 - a faster ordered dither. This is the
- default.
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- mbordered - ordered dithering at the macroblock level.
- Although there is a noticeable decrease in dither
- quality, this is the fastest dither available.
-
- fs4 - Floyd-Steinberg dithering with 4 error values
- propagated.
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- fs2 - Floyd-Steinberg dithering with 2 error values
- propagated.
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- fs2fast - Fast Floyd-Steinberg dithering with 2 error
- values propagated.
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- hybrid - Hybrid dithering, a combination of ordered
- dithering for the luminance channel and Floyd-
- Steinberg 2 error dithering for the chrominance
- channels. Errors are NOT propagated properly and
- are dropped all together every two pixels in
- either direction.
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- hybrid2 - Hybrid dithering as above, but with error
- propagation among pixels.
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- 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 gradients.
-
- gray - Grayscale dithering. The image is dithered into
- 128 grayscales. Chrominance information is thrown
- away.
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- gray256 - Grayscale dithering. The image is dithered
- into 256 grayscales (requires private colormap).
- Chrominance information is thrown away.
-
- color - Full color display (only available on 24 bit
- color displays).
-
- color2 - Full color display with increased size (only
- available on 24 bit color displays).
-
- none - no dithering is done, no image is displayed.
- Used to time decoding process.
-
- mono - Floyd-Steinberg dithering for monochrome
- displays.
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- threshold - Floyd-simple dithering for monochrome
- displays.
-
- ppm - Write a PPM file for each frame.
-
- -loop : makes the player loop back to the beginning after
- reaching the end.
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- -owncm : makes the player use a private colormap for the
- window.
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- -step : requires the user to press return for each new
- frame.
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- MPEG_PLAY(1) USER COMMANDS MPEG_PLAY(1)
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- -seek offset : before playing the movie, seek to the given
- offset in the file (useful for large movies). In this
- case -end is redefined to give the number of frames to
- play, and -start has no meaning. The offset should
- point to a Sequence or (closed) GOP header, but data
- will be discarded until one is found. The initial
- sequence header will be parsed before the seek. The
- skipped sections must not change the quantization
- matrices or the results are undefined.
-
- -start num : Waits to start display until this frame number
- (previous frames are parsed).
-
- -end num : ends display at this frame number (except when
- -seek is used).
-
- -gamma gamma_correction_param : specifies the amount of
- gamma correction. Default is 0. Use higher values if
- movie looks dark and hard to see.
-
- -framerate num : sets the framerate of the playback to num
- frames per second. A value of 0 indicates that the
- stream should be played as fast as possible. The
- default is to play at the rate specified in the stream
- (if possible). Note this is merely a framerate lim-
- iter, it will not discard frames to meet the rate.
-
- -quiet : suppresses printing of frame numbers, timing infor-
- mation, and most error messages.
-
- -eachstat : causes statistics to be displayed after each
- frame. Only valid when compiled with -DANALYSIS.
-
- -shmem_off : turns shared memory off.
-
- -l_range num_colors : sets the number of colors assigned to
- the luminance component when dithering the image. The
- product of l_range, cr_range and cb_range should be
- less than the number of colors on the display.
-
- -cr_range num_colors : sets the number of colors assigned to
- the red component of the chrominance range when dither-
- ing the image. The product of l_range, cr_range and
- cb_range should be less than the number of colors on
- the display.
-
- -cb_range num_colors : sets the number of colors assigned to
- the blue component of the chrominance range when dith-
- ering the image. The product of l_range, cr_range and
- cb_range should be less than the number of colors on
- the display.
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- MPEG_PLAY(1) USER COMMANDS MPEG_PLAY(1)
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- -no_display : dithers, but does not display, usually used
- for testing and timing purposes.
-
- NOTES
- The player expects video streams only. It can handle multi-
- plexed MPEG streams (video+audio streams) by discarding the
- audio.
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- Some streams do not end with the proper sequence end code
- and will probably generate an "Improper sequence end code."
- error when done playing.
-
- This player can play XING data files. Be aware that XING
- makes no use of temporal redundancy or motion vector infor-
- mation. 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 representa-
- tive of the player's ability.
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- The player does not play MPEG-1 D-frame streams, but they
- are a rarity.
-
- VERSION
- This is version 2.1, containing some new features since 2.0,
- and several bug fixes. It is a major change since version
- 1.0.
-
- BUGS
- The only known bug is that multiple mpeg_plays cannot seem
- to be run simultaneously on a multiprocessor SPARC 20 (in
- particular: On a bi-processor Sparc 20 running Solaris 2.3
- or 2.4, it is not possible to run two concurrent "mpeg_play
- -loop" on the same bitstream. One of the mpeg_play dies
- when it loops. )
-
- AUTHORS
- Ketan Patel - University of California, Berkeley,
- kpatel@cs.berkeley.edu
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- Brian Smith - University of California, Berkeley,
- bsmith@cs.berkeley.edu
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- Henry Chi-To Ma - University of California, Berkeley,
- cma@cs.berkeley.edu
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- Kim Man Liu - University of California, Berkeley,
- kliu@cs.berkeley.edu
-
- Steve Smoot - University of California, Berkeley,
- smoot@cs.berkeley.edu
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- MPEG_PLAY(1) USER COMMANDS MPEG_PLAY(1)
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- Eugene Hung - University of California, Berkeley,
- eyhung@cs.berkeley.edu
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