向MPlayer发送的命令可以参考

SLAVE MODE PROTOCOL

-------------------



The -slave option switches on slave mode, in which MPlayer works as a backend

for other programs. Instead of intercepting keyboard events, MPlayer will read

commands separated by a newline (\n) from stdin.



To try slave mode out by hand, run



mplayer -slave -quiet



and type slave commands into the console window.



You can also use a fifo file (named pipe):



mkfifo

mplayer -slave -input file=



Most slave mode commands are equivalent to command line options, though not

necessarily under the same name. Detailed descriptions can be found in the

man page.



All commands can be prefixed with one of "pausing ", "pausing_keep ", or

"pausing_toggle ". "pausing " tells MPlayer to pause as soon as possible

after processing the command. "pausing_keep " tells MPlayer to do so only if

it was already in paused mode. "pausing_toggle " tells MPlayer to do so

only if it was not already in paused mode. Please note that "as soon as

possible" can be before the command is fully executed.

As a temporary hack, there is also the _experimental_ "pausing_keep_force "

prefix, with which MPlayer will not exit the pause loop at all.

Like this you can avoid the "frame stepping" effect of "pausing_keep "

but most commands will either not work at all or behave in unexpected ways.

For "set_mouse_pos" and "key_down_event", "pausing_keep_force" is the default

since other values do not make much sense for them.





Various tips and tricks (please help expand it!):



- Try using something like

pausing_keep_force pt_step 1

get_property pause

to switch to the next file. It avoids audio playback starting to play

the old file for a short time before switching to the new one.

- To ensure the user can't control MPlayer "behind your back" use

something like -input nodefault-bindings -noconfig all





Available commands ('mplayer -input cmdlist' will print a list):



af_add  (comma separated list of audio filters with parameters)

(experimental) Load the given list of audio filters.



af_clr

(experimental) Unload all loaded audio filters.



af_cmdline

(experimental) Send new command-line options to a filter with the given name.



af_del  (comma separated list of audio filter's names)

(experimental) Unload the first occurrence of the filters, if loaded.



af_switch  (comma separated list of audio filters with parameters)

(experimental) Remove all the audio filters and replace them with the given list.



alt_src_step  (ASX playlist only)

When more than one source is available it selects the next/previous one.



audio_delay  [abs]

Set/adjust the audio delay.

If [abs] is not given or is zero, adjust the delay by  seconds.

If [abs] is nonzero, set the delay to  seconds.



[brightness|contrast|gamma|hue|saturation]  [abs]

Set/adjust video parameters.

If [abs] is not given or is zero, modifies parameter by .

If [abs] is non-zero, parameter is set to .

is in the range [-100, 100].



capturing [value]

Toggle/set capturing the primary stream like -dumpstream.

Requires the -capture parameter to be given.



change_rectangle

Change the position of the rectangle filter rectangle.



Must be one of the following:

0 = width

1 = height

2 = x position

3 = y position



If  is 0 or 1:

Integer amount to add/subtract from the width/height.

Positive values add to width/height and negative values

subtract from it.

If  is 2 or 3:

Relative integer amount by which to move the upper left

rectangle corner. Positive values move the rectangle

right/down and negative values move the rectangle left/up.



dvb_set_channel

Set DVB channel.



dvdnav

Press the given dvdnav button.

up

down

left

right

menu

select

prev

mouse



edl_loadfile

Load new EDL file.



edl_mark

Write the current position into the EDL file.



frame_drop [value]

Toggle/set frame dropping mode.



get_audio_bitrate

Print out the audio bitrate of the current file.



get_audio_codec

Print out the audio codec name of the current file.



get_audio_samples

Print out the audio frequency and number of channels of the current file.



get_file_name

Print out the name of the current file.



get_meta_album

Print out the 'Album' metadata of the current file.



get_meta_artist

Print out the 'Artist' metadata of the current file.



get_meta_comment

Print out the 'Comment' metadata of the current file.



get_meta_genre

Print out the 'Genre' metadata of the current file.



get_meta_title

Print out the 'Title' metadata of the current file.



get_meta_track

Print out the 'Track Number' metadata of the current file.



get_meta_year

Print out the 'Year' metadata of the current file.



get_percent_pos

Print out the current position in the file, as integer percentage [0-100).



get_property

Print out the current value of a property.



get_sub_visibility

Print out subtitle visibility (1 == on, 0 == off).



get_time_length

Print out the length of the current file in seconds.



get_time_pos

Print out the current position in the file in seconds, as float.



get_vo_fullscreen

Print out fullscreen status (1 == fullscreened, 0 == windowed).



get_video_bitrate

Print out the video bitrate of the current file.



get_video_codec

Print out the video codec name of the current file.



get_video_resolution

Print out the video resolution of the current file.



screenshot

Take a screenshot. Requires the screenshot filter to be loaded.

0 Take a single screenshot.

1 Start/stop taking screenshot of each frame.



key_down_event

Inject  key code event into MPlayer.



loadfile

Load the given file/URL, stopping playback of the current file/URL.

If  is nonzero playback continues and the file/URL is

appended to the current playlist instead.



loadlist

Load the given playlist file, stopping playback of the current file.

If  is nonzero playback continues and the playlist file is

appended to the current playlist instead.



loop  [abs]

Adjust/set how many times the movie should be looped. -1 means no loop,

and 0 forever.



menu

Execute an OSD menu command.

up Move cursor up.

down Move cursor down.

ok Accept selection.

cancel Cancel selection.

hide Hide the OSD menu.



set_menu

Display the menu named .



mute [value]

Toggle sound output muting or set it to [value] when [value] >= 0

(1 == on, 0 == off).



osd [level]

Toggle OSD mode or set it to [level] when [level] >= 0.



osd_show_progression

Show the progression bar, the elapsed time and the total duration of the

movie on the OSD.



osd_show_property_text  [duration] [level]

Show an expanded property string on the OSD, see -playing-msg for a

description of the available expansions. If [duration] is >= 0 the text

is shown for [duration] ms. [level] sets the minimum OSD level needed

for the message to be visible (default: 0 - always show).



osd_show_text  [duration] [level]

Show  on the OSD.



panscan <-1.0 - 1.0> | <0.0 - 1.0>

Increase or decrease the pan-and-scan range by , 1.0 is the maximum.

Negative values decrease the pan-and-scan range.

If  is != 0, then the pan-and scan range is interpreted as an

absolute range.



pause

Pause/unpause the playback.



frame_step

Play one frame, then pause again.



pt_step  [force]

Go to the next/previous entry in the playtree. The sign of  tells

the direction. If no entry is available in the given direction it will do

nothing unless [force] is non-zero.



pt_up_step  [force]

Similar to pt_step but jumps to the next/previous entry in the parent list.

Useful to break out of the inner loop in the playtree.



quit [value]

Quit MPlayer. The optional integer [value] is used as the return code

for the mplayer process (default: 0).



radio_set_channel

Switch to . The 'channels' radio parameter needs to be set.



radio_set_freq

Set the radio tuner frequency.



radio_step_channel <-1|1>

Step forwards (1) or backwards (-1) in channel list. Works only when the

'channels' radio parameter was set.



radio_step_freq

Tune frequency by the  (positive - up, negative - down).



seek  [type]

Seek to some place in the movie.

0 is a relative seek of +/-  seconds (default).

1 is a seek to  % in the movie.

2 is a seek to an absolute position of  seconds.



seek_chapter  [type]

Seek to the start of a chapter.

0 is a relative seek of +/-  chapters (default).

1 is a seek to chapter .



switch_angle

Switch to the angle with the ID [value]. Cycle through the

available angles if [value] is omitted or negative.



set_mouse_pos

Tells MPlayer the coordinates of the mouse in the window.

This command doesn't move the mouse!



set_property

Set a property.



speed_incr

Add  to the current playback speed.



speed_mult

Multiply the current speed by .



speed_set

Set the speed to .



step_property  [value] [direction]

Change a property by value, or increase by a default if value is

not given or zero. The direction is reversed if direction is less

than zero.



stop

Stop playback.



sub_alignment [value]

Toggle/set subtitle alignment.

0 top alignment

1 center alignment

2 bottom alignment



sub_delay  [abs]

Adjust the subtitle delay by +/-  seconds or set it to

seconds when [abs] is nonzero.



sub_load

Loads subtitles from .



sub_log

Logs the current or last displayed subtitle together with filename

and time information to ~/.mplayer/subtitle_log. Intended purpose

is to allow convenient marking of bogus subtitles which need to be

fixed while watching the movie.



sub_pos  [abs]

Adjust/set subtitle position.



sub_remove [value]

If the [value] argument is present and non-negative, removes the subtitle

file with index [value]. If the argument is omitted or negative, removes

all subtitle files.



sub_select [value]

Display subtitle with index [value]. Turn subtitle display off if

[value] is -1 or greater than the highest available subtitle index.

Cycle through the available subtitles if [value] is omitted or less

than -1 (forward or backward respectively).

Supported subtitle sources are -sub options on the command

line, VOBsubs, DVD subtitles, and Ogg and Matroska text streams.

This command is mainly for cycling all subtitles, if you want to set

a specific subtitle, use sub_file, sub_vob, or sub_demux.



sub_source [source]

Display first subtitle from [source]. Here [source] is an integer:

SUB_SOURCE_SUBS (0) for file subs

SUB_SOURCE_VOBSUB (1) for VOBsub files

SUB_SOURCE_DEMUX (2) for subtitle embedded in the media file or DVD subs.

If [source] is -1, will turn off subtitle display.

If [value] is omitted or less than -1, will cycle between the first subtitle

of each currently available source (forward or backward respectively).



sub_file [value]

Display subtitle specifid by [value] for file subs. The [value] is

corresponding to ID_FILE_SUB_ID values reported by '-identify'.

If [value] is -1, will turn off subtitle display.

If [value] is omitted or less than -1, will cycle all file subs

(forward or backward respectively).



sub_vob [value]

Display subtitle specifid by [value] for vobsubs. The [value] is

corresponding to ID_VOBSUB_ID values reported by '-identify'.

If [value] is -1, will turn off subtitle display.

If [value] is omitted or less than -1, will cycle all vobsubs

(forward or backward respectively).



sub_demux [value]

Display subtitle specifid by [value] for subtitles from DVD or embedded

in media file. The [value] is corresponding to ID_SUBTITLE_ID values

reported by '-identify'. If [value] is -1, will turn off subtitle display.

If [value] is omitted or less than -1, will cycle all DVD subs or embedded subs

(forward or backward respectively).



sub_scale  [abs]

Adjust the subtitle size by +/-  or set it to  when [abs]

is nonzero.



vobsub_lang

This is a stub linked to sub_select for backwards compatibility.



sub_step

Step forward in the subtitle list by  steps or backwards if

is negative.



sub_visibility [value]

Toggle/set subtitle visibility.



forced_subs_only [value]

Toggle/set forced subtitles only.



switch_audio [value] (currently MPEG*, AVI, Matroska and streams handled by libavformat)

Switch to the audio track with the ID [value]. Cycle through the

available tracks if [value] is omitted or negative.



switch_angle [value] (DVDs only)

Switch to the DVD angle with the ID [value]. Cycle through the

available angles if [value] is omitted or negative.



switch_ratio [value]

Change aspect ratio at runtime. [value] is the new aspect ratio expressed

as a float (e.g. 1.77778 for 16/9).

There might be problems with some video filters.



switch_title [value] (DVDNAV only)

Switch to the DVD title with the ID [value]. Cycle through the

available titles if [value] is omitted or negative.



switch_vsync [value]

Toggle vsync (1 == on, 0 == off). If [value] is not provided,

vsync status is inverted.



teletext_add_digit

Enter/leave teletext page number editing mode and append given digit to

previously entered one.

0..9 - Append apropriate digit. (Enables editing mode if called from normal

mode, and switches to normal mode when third digit is entered.)

- - Delete last digit from page number. (Backspace emulation, works only

in page number editing mode.)



teletext_go_link <1-6>

Follow given link on current teletext page.



tv_start_scan

Start automatic TV channel scanning.



tv_step_channel

Select next/previous TV channel.



tv_step_norm

Change TV norm.



tv_step_chanlist

Change channel list.



tv_set_channel

Set the current TV channel.



tv_last_channel

Set the current TV channel to the last one.



tv_set_freq

Set the TV tuner frequency.



tv_step_freq

Set the TV tuner frequency relative to current value.



tv_set_norm

Set the TV tuner norm (PAL, SECAM, NTSC, ...).



tv_set_brightness <-100 - 100> [abs]

Set TV tuner brightness or adjust it if [abs] is set to 0.



tv_set_contrast <-100 -100> [abs]

Set TV tuner contrast or adjust it if [abs] is set to 0.



tv_set_hue <-100 - 100> [abs]

Set TV tuner hue or adjust it if [abs] is set to 0.



tv_set_saturation <-100 - 100> [abs]

Set TV tuner saturation or adjust it if [abs] is set to 0.



use_master

Switch volume control between master and PCM.



vo_border [value]

Toggle/set borderless display.



vo_fullscreen [value]

Toggle/set fullscreen mode.



vo_ontop [value]

Toggle/set stay-on-top.



vo_rootwin [value]

Toggle/set playback on the root window.



volume  [abs]

Increase/decrease volume or set it to  if [abs] is nonzero.



overlay_add

Add an overlay bitmap.  must be a PGM file without comments.

is an arbitrary integer used to identify the overlay.



overlay_remove

Remove all overlays identified by .





The following commands are really only useful for OSD menu console mode:



help

Displays help text, currently empty.



exit

Exits from OSD menu console. Unlike 'quit', does not quit MPlayer.



hide

Hides the OSD menu console. Clicking a menu command unhides it. Other

keybindings act as usual.



run

Run  as shell command. In OSD menu console mode stdout and stdin

are through the video output driver.





Available properties:



name type min max get set step comment

=================================================================



osdlevel int 0 3 X X X as -osdlevel

speed float 0.01 100 X X X as -speed

loop int -1 X X X as -loop

pause flag 0 1 X 1 if paused, use with pausing_keep_force

filename string X file playing wo path

path string X file playing

demuxer string X demuxer used

stream_pos pos 0 X X position in stream

stream_start pos 0 X start pos in stream

stream_end pos 0 X end pos in stream

stream_length pos 0 X (end - start)

stream_time_pos time 0 X present position in stream (in seconds)

chapter int 0 X X X select chapter

chapters int X number of chapters

angle int 0 X X X select angle

length time X length of file in seconds

percent_pos int 0 100 X X X position in percent

time_pos time 0 X X X position in seconds

metadata str list X list of metadata key/value

metadata/* string X metadata values

volume float 0 100 X X X change volume

balance float -1 1 X X X change audio balance

mute flag 0 1 X X X

audio_delay float -100 100 X X X

audio_format int X

audio_codec string X

audio_bitrate int X

samplerate int X

channels int X

switch_audio int -2 255 X X X select audio stream

switch_angle int -2 255 X X X select DVD angle

switch_title int -2 255 X X X select DVD title

capturing flag 0 1 X X X dump primary stream if enabled

fullscreen flag 0 1 X X X

deinterlace flag 0 1 X X X

ontop flag 0 1 X X X

rootwin flag 0 1 X X X

border flag 0 1 X X X

framedropping int 0 2 X X X 1 = soft, 2 = hard

gamma int -100 100 X X X

brightness int -100 100 X X X

contrast int -100 100 X X X

saturation int -100 100 X X X

hue int -100 100 X X X

panscan float 0 1 X X X

vsync flag 0 1 X X X

video_format int X

video_codec string X

video_bitrate int X

width int X "display" width

height int X "display" height

fps float X

aspect float X

switch_video int -2 255 X X X select video stream

switch_program int -1 65535 X X X (see TAB default keybind)

sub int -1 X X X select subtitle stream

sub_source int -1 2 X X X select subtitle source

sub_file int -1 X X X select file subtitles

sub_vob int -1 X X X select vobsubs

sub_demux int -1 X X X select subs from demux

sub_delay float X X X

sub_pos int 0 100 X X X subtitle position

sub_alignment int 0 2 X X X subtitle alignment

sub_visibility flag 0 1 X X X show/hide subtitles

sub_forced_only flag 0 1 X X X

sub_scale float 0 100 X X X subtitles font size

tv_brightness int -100 100 X X X

tv_contrast int -100 100 X X X

tv_saturation int -100 100 X X X

tv_hue int -100 100 X X X

teletext_page int 0 799 X X X

teletext_subpage int 0 64 X X X

teletext_mode flag 0 1 X X X 0 - off, 1 - on

teletext_format int 0 3 X X X 0 - opaque,

1 - transparent,

2 - opaque inverted,

3 - transp. inv.

teletext_half_page int 0 2 X X X 0 - off, 1 - top half,

2- bottom half