References ▼
The LEAD MPEG-4 Encoder implements the ICodecAP interface and can be configured by setting any of the supported properties through this interface.
Descriptions of supported transform properties are provided in the following table:
| Codec API Property | Property in ILMFMP4Encoder Interface | Description |
|---|---|---|
| CODECAPI_AVEncCommonRateControlMode | CompressionMode | Specifies the rate control mode. |
| Possible values are ( members of eAVEncCommonRateControlMode enumeration): | ||
| eAVEncCommonRateControlMode_Quality: Use the CODECAPI_AVEncCommonQuality property value to regulate the image quality. | ||
| eAVEncCommonRateControlMode_PeakConstrainedVBR: Vary the quality over short durations. | ||
| However, it will achieve an average rate matching the CODECAPI_AVEncCommonMeanBitRate property value. | ||
| eAVEncCommonRateControlMode_CBR: Adhere strictly to the rate specified in the CODECAPI_AVEncCommonMeanBitRate property. | ||
| CODECAPI_AVEncCommonMeanBitRate | BitRate | Specifies the average or constant bitrate used when the CODECAPI_AVEncCommonRateControlMode is set to eAVEncCommonRateControlMode_CBR |
| or eAVEncCommonRateControlMode_PeakConstrainedVBR. The value is in bits per second. | ||
| CODECAPI_AVEncCommonQuality | QFactor | Specifies the quality factor for encoding. The quality factor is used in compressing the video stream. |
| The lower the quality factor, the better the quality. | ||
| Possible values range from 1 (best) to 31 (worst). | ||
| CODECAPI_AVEncCommonMultipassMode | EncodingPasses | Specifies the number of encoding passes that the encoder supports. Possible values are 1 (default) or 2. |
| CODECAPI_AVEncMPVQScaleType | QuantType | The quantization method applied. Possible values are (members of the eAVEncMPVQScaleType enumeration): |
| eAVEncMPVQScaleType_Linear: Use H.263 quantization. | ||
| eAVEncMPVScanPattern_AlternateScan: Use MPEG quantization. |