#Avisynth filters movie#
#Avisynth filters code#

(This filter is optional since it has the potential to introduce artifacts into your video. The default parameters for CNR2 are also rather good. You can use the original CNR filter in VirtualDub and then transfer the values to CNR2. CNR2 operates in the YUY2 colorspace and lacks a GUI. The output of CNR2 is nearly identical to the output of the original CNR, yet CNR2 is 3 to 5 times faster.

#Avisynth filters movie#

(See the link at the left and the text file included with the filter for more details.)Д®xample: Smooth video from a Low Quality Movie (a good choice for TV captures)Д¬hroma Noise Reducer 2 (CNR2) is a filter that was inspired by the Chroma Noise Reduction (CNR) filter that we used in the 'basic' section. These presets include: movieHQ, movieLQ, animeHQ, animeLQ, animeBQ, vhsBQ. So instead of being just two-dimensional, it is called 3D (the third dimension being 'time'.) This filter has a myriad of settings, but features a few presets to make your life easier. But Convolution3D is different in that it has temporal elements as well. (See link at the left for more details.)Д®xample: Use default settings w/ Spatial filter disabledД¬onvolution3D is a spatial smoothing filter like the 2DCleaner filter that we talked about in the 'basic' section. It is recommended that Peach Smoother come immediately after comb filters (like Guava Comb), but before de-interlacing/IVTC filters. Peach Smoother operates in the YUY2 colorspace and works most effectively with relatively raw video. It has plenty of parameters to tweak if you so desire. It is particularly effective at cleaning up TV signals and automatically fine tunes itself to handle the signal quality. Peach Smoother is an adaptive temporal noise reduction filter with a spatial filter that kicks in when the temporal noise filter fails. (See link at the left for more details.)Д®xample: Use default settings w/ NTSC-type video Guava Comb can be used on NTSC and PAL video, but not on SECAM. Guava Comb should be used before any de-interlacing/IVTC filters. Guava Comb only works temporally and thus only eliminates stationary dot-crawl/crosstalk. Guava Comb only operates in the YUY2 colorspace. We will use Guava Comb primarily to minimize dot-crawl. It is very effective at removing video artifacts such as dot-crawl, and to a lesser extent, color crosstalk 'rainbows', and some kinds of shimmering. Guava Comb is a 'comb filter' (like the one in most 'digital' TVs) used to help poor Luma/Chroma separation in broadcast sources. Unlike VirtualDub's Levels which only works in RGB, this filter operates in both RGB and YUY2 colorspaces.Д®xample: Increase Gamma by 25% (leave input/output ranges untouched) Because this filter has no GUI like the Levels filter in VirtualDub, it was designed to accept parameters just like the VirtualDub version.

It performs gamma correction, as well as brightness and contrast. We will be working with the following filters: Levels, Guava Comb, Peach Smoother, Convolution3D, and Chroma Noise Reducer 2.ДЇilter Description (=> all filters listed here can be downloaded from this link <=) Many of AviSynth filters we introduce here are much like the ones available for VirtualDub, yet they are more powerful and a bit more advanced. Like the 'basic' section where we construct a filter chain to clean up the analog video signal, we are just going to introduce a few of the more popular filters and explain how they most effectively work together. Many of which are much faster and/or more powerful than any similar filter written for VirtualDub. In addition to all these filters, there are other filters available exclusively to AviSynth. Nearly every filter written for VirtualDub has since been ported to AviSynth.

AviSynth has a wider variety of filters available.

#Avisynth filters code#

Most filters written for AviSynth have been heavily optimized using assembler code to squeeze the most out of every CPU cycle. While it is true that many filters for VirtualDub are also well optimized, there are many that are not.

Most AviSynth filters are heavily optimized.

And more math means longer processing times. Compared to YUY2 which only uses 16 bits per pixel (bpp), RGB uses twice as much at 32 bits per pixel (bpp).

VirtualDub requires that all filter operations take place in the RGB colorspace. As we mentioned in the first guide, converting back and forth between YUV and RGB can cause deterioration of color accuracy. In contrast, our captured video and DVD video work in the YUV colorspaces (YUY2 and YV12). VirtualDub operates in the RGB colorspace.While it is true that VirtualDub filters are easy to use, here are a few reasons why we think AviSynth is better: At this point you may be wondering why we are using AviSynth to do our noise filtering when we could just use the VirtualDub filters we learned about in the 'basic' section.