Scaling (Video Encoder)
The Video Encoder embeds a scaling function that scales down the images from the native 4CIF resolution to one of the following resolutions 2CIF, CIF, and QCIF.
The resolution of each Encoded Video Stream can be defined independently.The stream can be configured for any one of the four available resolutions: 4CIF, 2CIF, CIF, and QCIF.The second stream is restricted to the lowest two resolutions: CIF, and QCIF.
You are able to reduce the image size on both horizontal and vertical axis by using the Virtual File System API.
The default resolution is 4CIF for the first stream and CIF for the second stream.
Following table shows the size of the images, the television system and the selected scaling factor.
Scaling |
Scaling factor (H x V) |
625-line system (H x V) |
525-line system (H x V) |
4CIF |
1 x 1 |
704 x 576 |
704 x 480 |
2CIF |
1 x 2 |
704 x 288 |
704 x 240 |
CIF |
2 x 2 |
352 x 288 |
352 x 240 |
QCIF |
4 x 4 |
176 x 144 |
176 x 112(*) |
(*) In QCIF resolution, the video encoder delivers 8 lines less than the video formatter. These lines are the 4 top and the 4 bottom lines which are not encoded.