BlankClip

BlankClip produces a solid color video clip with silent audio. The clip passed as an argument is used as a template - for frame rate, image size, and so on, but the template is optional. You can specify as many clip properties explicitly as you wish. By default, BlankClip will produce a pitch-black 10 second clip; 24 fps, 640x480, RGB32, with 16 bit, 44100 Hz, mono, silent audio.

When supplying a template, BlankClip returns a clip with properties copied from that template. If the template is audio-only, you get a blank audio-only clip, and if it's video-only you get a blank video-only clip. If you start to add parameters that force a video track (i.e. width, height or pixel_type) or audio track (i.e. audio_rate, channels or sample_type), the remaining parameters for that track will be the defaults. (AviSynth v2.60)

Blackness is an alias for BlankClip. The parameters are the same.

Syntax and Parameters

BlankClip( [clip clip, int length, int width, int height, string pixel_type,
      float fps, int fps_denominator, int audio_rate, bool stereo, bool sixteen_bit,
      int color, int color_yuv] ) (deprecated)

BlankClip( [clip clip, int length, int width, int height, string pixel_type,
      float fps, int fps_denominator, int audio_rate, int channels, string sample_type,
      int color, int color_yuv] )

Blackness( ...same parameters as BlankClip )

clip  clip =

if supplied, the resulting clip will have the clip properties of the template, except for the properties you define explicitly.

int  length = 240

Length of the resulting clip, in frames.

int  width = 640

int  height = 480

Width and height of the resulting clip.

string  pixel_type = "RGB32"

Pixel type of the resulting clip; can be any of the following:

RGB24	RGB32	YUY2	YV12	YV16 *	YV24 *	YV411 *	Y8 *
* AviSynth v2.60

AVS+ these additional color formats are allowed:

RGB48	RGB64	RGB(A)PS	RGB(A)Pxx	YUV(A)422Pxx	YUV(A)420Pxx	YUV(A)444Pxx	Yxx
where   S = 32-bit float (RGB only)   xx = integer bit depth: 10, 12, 14, or 16   (A) = optional alpha channel; for example RGBAP16 or YUVA420P10

float  fps = 24

Frame rate of the resulting clip.

int  fps_denominator = 1

Specify frame rate in rational form (numerator/denominator). For example, fps=30000,fps_denominator=1001 (approximately 29.97 fps) or fps=24000,fps_denominator=1001 (approximately 23.976 fps).

Note: if fps_denominator is given (even if it is "1"), fps is rounded to the nearest integer.

int  audio_rate = 44100

Sample rate of the (silent) audio.

int  channels = 1

Specifies the number of channels of (silent) audio.

bool  stereo = false

Deprecated: use channels instead.

If true, the (silent) audio is in stereo: channels=2.

string  sample_type = "16bit"

Specifies the audio sample type. It can be 8bit, 16bit, 24bit, 32bit or float.

bool  sixteen_bit = true

Deprecated: use sample_type instead.

true and false give both 16 bit, except when a template is used where a different bit is set.

int  color = $000000

Specifies the color of the clip, black (= $000000) by default. See color presets for preset color. See Colors for more information on specifying colors.

int  color_yuv =

Specifies the color of the clip using YUV values. It requires setting pixel_type to one of the YUV formats; otherwise it doesn't do anything.

Examples

# produces a black clip (3000 frames, width 720, height 576, framerate 25),
# with a silent audio track (16 bit 44.1 kHz stereo):
BlankClip(length=3000, width=720, height=576, fps=25, color=$000000)

# produces a black clip (3000 frames) with the remaining clip properties of the AVI:
video = AviSource("E:\pdwork\DO-Heaven.AVI")
BlankClip(video, length=3000, color=$000000)

# produces a black clip (3000 frames) with the remaining clip properties of the AVI:
# produces a black clip (3000 frames) with the remaining clip properties of the AVI:
video = AviSource("E:\pdwork\DO-Heaven.AVI")
audio = BlankClip(video, audio_rate=48000)
AudioDub(video, audio)

Changes

v2.55	Added color_yuv.
v2.58	Added channels and sample_type.
v2.60	Added pixel_type="YV24"/"YV16"/"YV411"/"Y8".
	Supply useful defaults for new Audio/Video when using a Video/Audio only template clip.