- Minimum Quantizer: Sets the minimum quantizer that x264 can encode with.
- Maximum Quantizer: Sets the maximum quantizer that x264 can encode with.
- Maximum Quantizer Delta: Set the maximum change in quantizer between frames.
- Credits Quantizer: For use if you set the credit starting point in the preview window.
- Factor Between I and P frame Quants: Boosts the bitrate of I frames compared to P frames by this amount.
- Factor between P and B frame Quants: Reduces the bitrate of B frames compared to P frames by this amount.
- Chroma QP Offset: Offset of chroma quantization values from luma.
- Inter / Intra luma quantization deadzone: Also known as inter/intra deadzone. Specifies the level of detail to be discarded and not taken into account by the encoder. Lower values discard less information, and therefore hand the encoder a more complex stream. The main use of these settings is to set a detail threshold. Lower settings can help grain retention, while higher settings may reduce noise. Use of deadzone settings requires trellis to be turned off.
- Mode: AQ reallocates bits based biased towards lower detail sections that need more than what is normally specified. You can choose for this reallocation to end up averaging out to the same number of bits over the entire video (default), or over each individual frame. You can also completely disable AQ here.
- Strength: Set the strength of AQ compensation. Lower values reduce the compensation strength.
Quantization matrix: Set a custom quantization matrix to be used. You must specify the custom matrix. The default matrix (none) is a flat matrix. x264 also includes the JVT matrix.
Custom Command Line: Add arbitrary text to the x264 commandline. This is added to the very end of the entire line.
Macroblock Options Enable and disable different macroblocks that can be used during the encoding process. The letter refers to the frame type the macroblock can be used in (either i, p or b), and the numbers refer to the partition size (either 8x8 or 4x4 pixels). Adaptive DCT allows an 8x8 transform in addition to the default 4x4 transform.
- Number of B-Frames: Sets the number of consecutive B-Frames (B-VOPs)
- Adaptive B-Frames: Allows x264 to use a dynamic number of consecutive B-Frames
- B-Pyramid: Allows use of B-Frames as references
- RDO for B-Frames: Uses RDO algorithms on B-Frames (requires subpixel motion estimation set to level 6 or higher).
- Weighted Bi-Prediction: When combined with multiple consecutive B-frames, this improves the prediction of fades.
- Bidirectional ME: Motion estimation is optimised in both forwards and backwards temporal directions
- B-Frame Mode: Motion vector prediction method for B-Frames. Auto selects the best method per-frame
- B-Frame Bias: Modify the bias for use of Adaptive B-Frames. Higher values increase use, lower values decrease.