setvideo
The setvideo command sets values associated with video playback and capture. Digital-video and VCR devices recognize this command. wsprintf(lpstrCommand, "setvideo %s %s %s", lpszDeviceID, lpszVideo,lpszFlags); Parameters lpszDeviceID Identifier of an MCI device. This identifier or alias is assigned when the device is opened. lpszVideo Flag for video playback and capture. The following table lists device types that recognize the setvideo command and the flags used by each type:
| digitalvideo
| algorithm algorithm
bitsperpel to count brightness to factor clocktime color to factor contrast to factor gamma to value halftone input key color to r:g:b key index to index off on output | over duration
palette color color over index to newrgb palette handle to handle quality descriptor record frame rate to rate record on record off sharpness to factor source to source number value still algorithm algorithm still quality descriptor stream to number tint to factor |
| off
on monitor to type number number record off record track track_number off | record on
record track track_number on source to type number number track track_number off track track_number on |
| algorithm algorithm
| Specifies a video compression algorithm for use by a subsequent reserve or record command. Algorithms supported by a device are device specific. MCI defines
the constants "mpeg" and "h261" for algorithm.
If the specified algorithm conflicts with the current file format, the file format is changed to the default format for the algorithm. |
| bitsperpel to count
| Sets the number of bits per pixel for saving data with the capture or record command.
|
| brightness to factor
| Sets the video brightness level.
|
| clocktime
| Indicates that the time specified in the "over" flag is in milliseconds. The
time is absolute and not in step with the playing of the workspace.
|
| color to factor
| Sets the color-saturation level.
|
| contrast to factor
| Sets the video-contrast level.
|
| gamma to value
| Specifies the gamma correction exponent multiplied by 1000. For example, to
specify an exponent of 2.2, use 2200 for value. A gamma value of 1.0 (1000) indicates no gamma correction is applied. Gamma
correction adjusts the mapping between the intensity encoded in the
presentation source and the displayed brightness.
|
| halftone
| Causes the halftone palette to be used instead of the default palette. This
flag is recognized only by the MCIAVI digital-video driver.
|
| input
| Modifies the "brightness", "color", "contrast", "gamma", "sharpness", or
"tint" flag so that it affects the input signal and modifies what is recorded. If
possible, this is the default when monitoring the input.
|
| key color to r:g:b
| Sets the key color. The r:g:b variable is a Windows RGB value. Colons (:) separate the individual red, green, and blue values.
|
| key index to index
| Sets the key index. The index variable is a physical palette index.
|
| monitor to type number number
| Controls which source input will be passed to the VCR output, without changing
the recording source input selection. Type can be "output", or one of the valid input sources. If "number" is not
specified, then the first input of that type is chosen.
|
| off
on | Enables or disables display of video. Disabling video sets the pixels in the put "destination" rectangle (or its default, the client region of the current
window) to a solid color. It has no effect on the frame buffer.
The video source, whether the workspace or an external input, might continue to store new images in the frame buffer. They are not displayed until video is enabled. You can use the window "state" command to hide the window. The default is setvideo "on". |
| output
| Modifies the "brightness", "color", "contrast", "gamma", "sharpness", or
"tint" flag so that it modifies only the displayed signal and not what is recorded.
If possible, this is the default when monitoring a file.
|
| over duration
| Specifies how long it should take to make a change that uses a factor variable. The units for duration are in the current time format. Changes occur in step with the playing of the
workspace. When playing is suspended, the change is also suspended until the
play continues. If "over" is not used or not supported, the change occurs
immediately.
|
| palette color color over index to newrgb
| Sets a new palette color. The color and palette index to be changed are
specified by the color and index parameters; the new color is specified by newrgb. This flag is recognized only by the MCIAVI digital-video driver.
|
| palette handle to handle
| Specifies the handle to a palette the device must use for rendering. This item
is supported only by devices that use palettes. If handle is zero, the default palette is used.
Digital-video devices should not free the palette passed with this command. Applications should free it after they close the device. |
| Specifies the characteristics of the video compression performed when video is
recorded to a file. All devices support the three descriptors: "low",
"medium", and "high". The default is device specific. The significance of these names
depends on the algorithm and the device. Devices might define additional
descriptor names. The quality command can be used to define additional descriptor names.
If the "algorithm" flag is not used, the descriptor applies to the current algorithm. |
| record frame rate to rate
| Sets the recording for motion video. The recording rate is specified in units of frames per second multiplied by 1000. For example,
the NTSC frame rate of 29.97 frames per second is represented as 29970.
|
| record on
record off | Enables or disables recording of video data. Recording video data is the
default.
|
| record track track_number off
| Clears the video-source selection so that no video will be recorded with the
next record command. "Track" allows independent track selection. If "track" is not
specified, a default value of 1 is assumed. It might be necessary to first issue a set "assemble record off" command before the video recording can be turned off.
|
| record track track_number on
| Selects the video source to be recorded with the next record command. "Track" allows independent track selection. Track 2 corresponds to the PCM track in
Hi8. If "track" is not specified, a default of 1 is assumed.
|
| sharpness to factor
| Sets the video sharpness level.
|
| source to source number value
| Sets the source of the video input. This usually corresponds to external
connectors. The constants defined for source include "rgb", "pal", "ntsc", "svideo", and "secam". If more than one input
of the specified type exists, the optional "number" value indicates the desired input. For example, setvideo "source to ntsc number 2" specifies the second NTSC input.
If "to" source is omitted, then the absolute source is used as defined by the list "video source" command. |
| source to type number number
| Selects the video source to be recorded on the tape. Type must be "tuner", "line", "svideo", "aux", "generic", "mute", or "rgb".
|
| still algorithm algorithm
| Specifies the still image compression algorithm used by the capture command. Every device must support an algorithm of "none", which means no compression. This is the default. In this case,
digital-video devices save still images as RGB format device-independent bitmaps. Devices might also support a
device-specific list of additional algorithms.
|
| still quality descriptor
| Specifies the characteristics of the still-image compression performed while
capturing a still image. All devices support the descriptors "low", "medium",
and "high". The default is device specific.
If the "algorithm" flag is not used, the descriptor applies to the current algorithm. The quality command can be used to define other descriptor names. |
| stream to number
| Specifies the video stream played back from the workspace. If the stream is
not specified and a default stream is not defined by the file format, then the
physically first interleaved video stream is played.
|
| tint to factor
| Sets the image tint. Typically, this adjustment is modeled after the tint
control of many color television sets, with 250 meaning green, 750 meaning red, and
0 (or 1000) meaning blue. The nominal value is always 500.
|
| track track_number off
| Disables an individual video track.
|
| track track_number on
| Enables an individual video track.
|
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