Avisynth functions and their VapourSynth equivalents
====================================================

+------------------------+---------------------+----------------------------------------------------------------------+
| Avisynth               | VapourSynth         | Notes                                                                |
+========================+=====================+======================================================================+
| AviSource              | avisource.AVISource | Use FFMS2 instead when possible                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| DirectShowSource       | none                | There will be no source filter using DirectShow because there's no   |
|                        |                     | real need for it. Use FFMS2 instead.                                 |
+------------------------+---------------------+----------------------------------------------------------------------+
| ImageReader/ImageWriter| imwri plugin        |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| Import                 | none                | See the documentation for Python's import for scripts.               |
+------------------------+---------------------+----------------------------------------------------------------------+
| ConvertTo*             | resize.Bicubic(     | This also determines the resizer used for chroma resampling,         |
|                        | format=vs.YUV444P8) | if needed                                                            |
+------------------------+---------------------+----------------------------------------------------------------------+
| ColorYUV               | std.Lut/std.Expr    | Do the adjustment yourself                                           |
+------------------------+---------------------+----------------------------------------------------------------------+
| GreyScale              | std.ShufflePlanes   | ShufflePlanes(clips=inclip, planes=0, colorfamily=vs.GRAY)           |
|                        |                     | Extracts the first plane. Y for YUV, R for RGB, planes=1/2 = U/V G/B |
+------------------------+---------------------+----------------------------------------------------------------------+
| Invert                 | std.Invert          |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| Limiter                | std.Limiter         |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| MergeRGB               | std.ShufflePlanes   | ShufflePlanes(clips=[R,G,B], planes=[0, 0, 0], colorfamily=vs.RGB)   |
+------------------------+---------------------+----------------------------------------------------------------------+
| MergeChroma/MergeLuma  | std.ShufflePlanes   | ShufflePlanes(clips=[Yclip,UVclip], planes=[0, 1, 2],                |
|                        |                     | colorfamily=vs.YUV)                                                  |
+------------------------+---------------------+----------------------------------------------------------------------+
| RGBAdjust              | std.Lut/std.Expr    | Do the adjustment yourself                                           |
+------------------------+---------------------+----------------------------------------------------------------------+
| ShowAlpha/ShowRed/     | std.ShufflePlanes   | ShufflePlanes(clips=inclip, planes=0, colorfamily=vs.GRAY)           |
| ShowGreen/ShowBlue     |                     | Extracts the first plane. Y for YUV, R for RGB, planes=1/2 = U/V G/B |
+------------------------+---------------------+----------------------------------------------------------------------+
| SwapUV                 | std.ShufflePlanes   | ShufflePlanes(clips=inclip, planes=[0, 2, 1], colorfamily=vs.YUV)    |
+------------------------+---------------------+----------------------------------------------------------------------+
| Tweak                  | std.Lut/std.Expr    | Do the adjustment yourself                                           |
+------------------------+---------------------+----------------------------------------------------------------------+
| UToY/VToY/*            | std.ShufflePlanes   | See GreyScale and the other examples                                 |
+------------------------+---------------------+----------------------------------------------------------------------+
| ColorKeyMask           | std.Lut/std.Expr    | Do the adjustment yourself                                           |
+------------------------+---------------------+----------------------------------------------------------------------+
| Layer                  | std.Lut2/std.Expr   | Do the adjustment yourself                                           |
+------------------------+---------------------+----------------------------------------------------------------------+
| Overlay                | std.Lut2/std.Expr   | Do the adjustment yourself                                           |
+------------------------+---------------------+----------------------------------------------------------------------+
| Subtract               | std.Lut2/std.Expr   | Do the adjustment yourself                                           |
+------------------------+---------------------+----------------------------------------------------------------------+
| AddBorders             | std.AddBorders      |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| Crop                   | std.CropAbs/Crop    |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| FlipHorizontal/        | std.FlipHorizontal/ |                                                                      |
| FlipVertical           | std.FlipVertical    |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| Letterbox              | std.CropAbs+        |                                                                      |
|                        | std.AddBorders      |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| ReduceBy2              | resize.*            | Too specialized to ever be included in the core                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| Resize (all kinds)     | resize.*            |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| Turn180                | std.Turn180         |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| TurnRight/TurnLeft     | std.Transpose       | Add std.FlipHorizontal/std.FlipVertical to create a true turn        |
+------------------------+---------------------+----------------------------------------------------------------------+
| ConditionalFilter      | std.FrameEval       | Can also substitute many of the other conditionals                   |
+------------------------+---------------------+----------------------------------------------------------------------+
| Animate                | std.FrameEval       | Combine with python scripting                                        |
+------------------------+---------------------+----------------------------------------------------------------------+
| ApplyRange             | none                | Use python scripting instead                                         |
+------------------------+---------------------+----------------------------------------------------------------------+
| BlankClip              | std.BlankClip       |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+
| StackHorizontal/       | std.StackHorizontal/|                                                                      |
| StackVertical          | std.StackVertical   |                                                                      |
+------------------------+---------------------+----------------------------------------------------------------------+