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docs: document VideoToolbox look-ahead-frame-count and disable-spatial-adaptive-qp options
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‎source/docs/en/latest/technical/video-videotoolbox.markdown

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@@ -93,16 +93,18 @@ The following value types are supported (each option only accepts one value type
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### Options list
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| Option | Type | H.264 | H.265 | Detail |
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|------------------|-------------|:-----:|:-----:|-----------------------------------------------------------------------------------------------------------|
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| 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. |
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| keyint | int | ✓ | ✓ | Sets the maximum interval between key frames, also known as the key frame rate. |
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| bframes | boolean | ✓ | ✓ | Set to `1` to enable Reference B-Frames (default), `0` to disable. |
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| cabac | boolean | ✓ | | Set to `1` to enable cabac, `0` to disable. Note the hyphen for H.264. |
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| slice-max-size | boolean | ✓ | | Sets the maximum slice size for H.264 encoding in bytes. |
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| vbv-bufsize | boolean | ✓ | ✓ | Sets the size of the VBV buffer in bytes per second. |
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| vbv-maxrate | boolean | ✓ | ✓ | Sets the maximum rate the VBV buffer should be assumed to refill at, in bytes per second. |
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| qpmin | int | ✓ | ✓ | Sets the minimum quantizer that will be used. |
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| qpmax | int | ✓ | ✓ | Sets the maximum quantizer that will be used. |
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| ref | int | ✓ | ✓ | Sets the maximum number of reference frames. |
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| 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. |
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| Option | Type | H.264 | H.265 | Detail |
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|-----------------------------|-------------|:-----:|:-----:|-----------------------------------------------------------------------------------------------------------|
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| 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. |
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| keyint | int | ✓ | ✓ | Sets the maximum interval between key frames, also known as the key frame rate. |
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| bframes | boolean | ✓ | ✓ | Set to `1` to enable Reference B-Frames (default), `0` to disable. |
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| cabac | boolean | ✓ | | Set to `1` to enable cabac, `0` to disable. Note the hyphen for H.264. |
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| slice-max-size | boolean | ✓ | | Sets the maximum slice size for H.264 encoding in bytes. |
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| vbv-bufsize | boolean | ✓ | ✓ | Sets the size of the VBV buffer in bytes per second. |
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| vbv-maxrate | boolean | ✓ | ✓ | Sets the maximum rate the VBV buffer should be assumed to refill at, in bytes per second. |
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| qpmin | int | ✓ | ✓ | Sets the minimum quantizer that will be used. |
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| qpmax | int | ✓ | ✓ | Sets the maximum quantizer that will be used. |
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| ref | int | ✓ | ✓ | Sets the maximum number of reference frames. |
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| 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. |
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| look-ahead-frame-count | int | ✓ | ✓ | The suggested number of frames to look ahead for rate control. |
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| disable-spatial-adaptive-qp | boolean | ✓ | ✓ | Disable spatial adaptation of the quantization parameter (QP) based on per-frame statistics. |

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