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docs: document VideoToolbox look-ahead-frame-count and disable-spatial-adaptive-qp options

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Damiano Galassi 2024-11-08 11:49:34 +01:00
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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
### 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. |
| keyint | int | ✓ | ✓ | Sets the maximum interval between key frames, also known as the key frame rate. |
| 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 | ✓ | | Sets 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. |
| qpmin | int | ✓ | ✓ | Sets the minimum quantizer that will be used. |
| qpmax | int | ✓ | ✓ | Sets the maximum quantizer that will be used. |
| ref | int | ✓ | ✓ | Sets the maximum number of reference frames. |
| 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. |
| 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. |
| keyint | int | ✓ | ✓ | Sets the maximum interval between key frames, also known as the key frame rate. |
| 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 | ✓ | | Sets 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. |
| qpmin | int | ✓ | ✓ | Sets the minimum quantizer that will be used. |
| qpmax | int | ✓ | ✓ | Sets the maximum quantizer that will be used. |
| ref | int | ✓ | ✓ | Sets the maximum number of reference frames. |
| 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. |
| look-ahead-frame-count | int | ✓ | ✓ | The suggested number of frames to look ahead for rate control. |
| disable-spatial-adaptive-qp | boolean | ✓ | ✓ | Disable spatial adaptation of the quantization parameter (QP) based on per-frame statistics. |