docs: en: Add VideoToolbox options.

source/docs/en/latest/technical/video-videotoolbox.markdown

@@ -18,7 +18,7 @@ Apple VideoToolbox
 
 ## Supported hardware
 
-- Most 2015 and later Macs
+- Most 2011 and later Macs
 
 Please note, these are not hard limits. Hardware encoding via VideoToolbox *might* work on older series GPUs and older operating systems, but this is not officially supported.
 
@@ -28,6 +28,7 @@ If your computer is supported you will see one or more of the following video en
 
 - H.264 (VideoToolbox)
 - H.265 (VideoToolbox)
+- H.265 10bit (VideoToolbox)
 
 Choice of the underlying hardware encoder (AMD VCE or Intel Quick Sync Video) is not available. The highest quality option will typically be chosen.
 
@@ -39,4 +40,38 @@ It is common, particularly on lower-end hardware, for the CPU to be a bottleneck
 
 ## Advanced options
 
-There are no advanced options available for VideoToolbox encoders.
+The VideoToolbox encoder has a limited set of advanced encoder options. Generally speaking, it is not recommended to change these parameters, as the built-in presets offer a good range of options for common uses.
+
+If using HandBrake’s graphical interface, you can set the options in the `Advanced Options` field on the `Video` tab in the following format:
+
+    option1=value1:option2=value2
+    
+If using HandBrake’s command line interface, use the `--encopts` parameter as follows:
+
+    --encopts="option1=value1:option2=value2"
+
+### Option value types
+
+The following value types are supported (each option only accepts one value type):
+
+- integer  
+  A number that can be written without a fractional or decimal component.
+
+- boolean  
+  0 means off (or disabled).  
+  1 means on (or enabled).
+ 
+- string  
+  An alphanumeric string of characters. See the option’s comments for acceptable values.
+
+### Options list
+
+| Option           | Type        | H.264 | H.265 | Detail                                                                                                    |
+|------------------|-------------|:-----:|:-----:|-----------------------------------------------------------------------------------------------------------|
+| gpu-registryid   | int         |   ✓   |   ✓   | GPU selection. If set, the VideoToolbox will only use a hardware encoder running on the GPU specified by the provided GPU registryID. |
+| bframes          | boolean     |   ✓   |   ✓   | Set to `1` to enable Reference B-Frames (default), `0` to disable.                                        |
+| cabac            | boolean     |   ✓   |       | Set to `1` to enable cabac, `0` to disable. Note the hyphen for H.264.                                    |
+| slice-max-size   | boolean     |   ✓   |       | Set the maximum slice size for H.264 encoding in bytes.                                                   |
+| vbv-bufsize      | boolean     |   ✓   |   ✓   | Sets the size of the VBV buffer in bytes per second.                                                      |
+| vbv-maxrate      | boolean     |   ✓   |   ✓   | Sets the maximum rate the VBV buffer should be assumed to refill at, in bytes per second.                 |
+| max-frame-delay  | int         |   ✓   |   ✓   | The maximum frame delay count is the maximum number of frames that a compressor is allowed to hold before it must output a compressed frame. |