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 <movie>

and type slave commands into the console window.

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.


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


alt_src_step <value> (ASX playlist only)
    When more than one source is available it selects the next/previous one.

audio_delay <value> [abs]
    Set/adjust the audio delay.
    If [abs] is not given or is zero, adjust the delay by <value> seconds.
    If [abs] is nonzero, set the delay to <value> seconds.

[brightness|contrast|gamma|hue|saturation] <value> [abs]
    Set/adjust video parameters.
    If [abs] is not given or is zero, modifies parameter by <value>.
    If [abs] is non-zero, parameter is set to <value>.
    <value> is in the range [-100, 100].

change_rectangle <val1> <val2>
    Change the position of the rectangle filter rectangle.
        <val1>
            Must be one of the following:
                0 = width
                1 = height
                2 = x position
                3 = y position
        <val2>
            If <val1> 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 <val1> 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 <channel_number> <card_number>
    Set DVB channel.

dvdnav <button>
    Press the given dvdnav button.
        1 up
        2 down
        3 left
        4 right
        5 menu
        6 select

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 <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.

grab_frames
    Currently unimplemented.

screenshot <value>
    Take a screenshot. Requires the screenshot filter to be loaded.
        0 Take a single screenshot.
        1 Start/stop taking screenshot of each frame.

gui_[about|loadfile|loadsubtitle|play|playlist|preferences|skinbrowser|stop]
    GUI actions

key_down_event <value>
    Inject <value> key code event into MPlayer.

loadfile <file|url> <append>
    Load the given file/URL, stopping playback of the current file/URL.
    If <append> is nonzero playback continues and the file/URL is
    appended to the current playlist instead.

loadlist <file> <append>
    Load the given playlist file, stopping playback of the current file.
    If <append> is nonzero playback continues and the playlist file is
    appended to the current playlist instead.

menu <command>
    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 <menu_name>
    Display the menu named <menu_name>.

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_property_text <string> [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 <string> [duration] [level]
    Show <string> on the OSD.

panscan <-1.0 - 1.0> | <0.0 - 1.0> <abs>
    Increase or decrease the pan-and-scan range by <value>, 1.0 is the maximum.
    Negative values decrease the pan-and-scan range.
    If <abs> 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 <value> [force]
    Go to the next/previous entry in the playtree. The sign of <value> tells
    the direction.  If no entry is available in the given direction it will do
    nothing unless [force] is non-zero.

pt_up_step <value> [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 <channel>
    Switch to <channel>. The 'channels' radio parameter needs to be set.

radio_set_freq <frequency in MHz>
    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.

seek <value> [type]
    Seek to some place in the movie.
        0 is a relative seek of +/- <value> seconds (default).
        1 is a seek to <value> % in the movie.
        2 is a seek to an absolute position of <value> seconds.

seek_chapter <value> [type]
    Seek to the start of a chapter.
        0 is a relative seek of +/- <value> chapters (default).
        1 is a seek to chapter <value>.

set_mouse_pos <x> <y>
    Tells MPlayer the coordinates of the mouse in the window.
    This command doesn't move the mouse!

set_property <property> <value>
    Set a property.

speed_incr <value>
    Add <value> to the current playback speed.

speed_mult <value>
    Multiply the current speed by <value>.

speed_set <value>
    Set the speed to <value>.

sub_alignment [value]
    Toggle/set subtitle alignment.
        0 top alignment
        1 center alignment
        2 bottom alignment

sub_delay <value> [abs]
    Adjust the subtitle delay by +/- <value> seconds or set it to <value>
    seconds when [abs] is nonzero.

sub_load <subtitle_file>
    Loads subtitles from <subtitle_file>.

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 <value> [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. Supported subtitle sources are -sub options on the command
    line, VOBsubs, DVD subtitles, and Ogg and Matroska text streams.

vobsub_lang
    This is a stub linked to sub_select for backwards compatibility.

sub_step <value>
    Step forward in the subtitle list by <value> steps or backwards if <value>
    is negative.

sub_visibility [value]
    Toggle/set subtitle visibility.

forced_subs_only [value]
    Toggle/set forced subtitles only.

switch_audio [value] (MPEG and Matroska only)
    Switch to the audio track with the id [value]. Cycle through the
    available tracks 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_vsync [value]
    Toggle vsync (1 == on, 0 == off). If [value] is not provided,
    vsync status is inverted.

tv_step_channel <channel>
    Select next/previous TV channel.

tv_step_norm
    Change TV norm.

tv_step_chanlist
    Change channel list.

tv_set_channel <channel>
    Set the current TV channel.

tv_last_channel
    Set the current TV channel to the last one.

tv_set_freq <frequency in MHz>
    Set the TV tuner frequency.

tv_set_norm <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 <value> [abs]
    Increase/decrease volume or set it to <value> if [abs] is nonzero.


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 <value>
    Run <value> as shell command. In OSD menu console mode stdout and stdin
    are through the video output driver.
