Feature List:
Unlimited* number of audio, video and picture tracks (*limited only by available memory)

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Unlimited number of video/audio effects for every track.

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Produce video with a resolution of 8x8 or 16000x16000 (~200 Megapixels / frame) and many sizes in between (custom)

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Full automation control for all track and effect variables using keyframes (cropping, zooming, panning, volume, rotation, opacity, key-color etc...)

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Full cross integration of audio and video. (noise gates triggering video effects. video brightness controlling volume etc.) Here is an example video.

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Looping of both audio and video signals simultaneously, with adjustable cross-fade on loop boundaries. (see musical loop tutorial)

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Manipulate the flow of time, forward, backward, speed up and slow down smoothly. (see speed change tutorial)

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Grouping of video/audio tracks into sub-groups (submixers) which can then be manipulated (faded/rotated/effected etc) as if they were a single track. (see submixer tutorial)

Feature List:
Up to 16 audio channels per track.

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Audio mixing with unlimited amounts of sub-groups in unlimited subgroup levels (16x16x16... mixing limit)

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Integral audio dsp running 48 kHz (16channels x 32bit) with 64bit normalization safety

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Sox audio processing on all platforms. zs4 will implement a sox front end which seamlessly integrates with native features (in progress)

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Musical time toolbars to allow for time related operations within the context of beats/bars/parts (see musical loop tutorial for an example)

Feature List:
Pixel/channel operations apply to r,g,b and a seperately, sometimes y and u/v as well:
expand (max dynamic range), invert, copy to/from alpha, swap with alpha etc...

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Matrix operations: edge detect, blur, key smoother

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Keys: rgb keying and chroma/yuv keying with superior quality

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Pattern effects to seamlessly tile images in various formations include looping effects

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Distortion effects: seamless bulge and squish, change point location, magnify, flowerify and remove perspective

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Colour adjusters: adjust hue, saturation and lightness, adjust rgba, adjust yuv and tint

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Miscellaneous: rotate move scale, wipe, dither, quantize...etc.

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Effect Containers: oval inside/outside, rectangle inside/outside, keep alpha, keep non-alpha, mix to parent alpha, mix to parent non-alpha...

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Build-your-own effect using above modular effects, grouped in (effect) containers and sequenced as desired..

Feature List:
Supported formats depend on Operating System and installed codecs. Below is a table outlining the currently supported formats by OS.

Input Formats	Windows	Linux	OSX
iyuv/i420, yv12 and yuv9 avi, mjpg avi, mpng avi, wav, jpg, png, bmp	x	x	x
Other avi files (depending on installed codecs)	x
aif, snd, ico, cur, gif	x
pnm, pbm, pgm, ppm, xpm, xbm	x	x
Output Formats
i420/iyuv-avi, motion-jpg avi, motion-png avi, wav	x	x	x

If you find that your files are incompatible, check out t@b Media Converter, a graphical front-end for mencoder and sox.

Note: On Windows only DV type 2 avi files are supported.  DV type 1's will need to be converted using t@b Media Converter or some other program.