Structure to hold Region Of Interest. More...

#include <frame.h>

Public Attributes
uint32_t	self_size

int	top

int	bottom

int	left

int	right

AVRational	qoffset

Detailed Description

Structure to hold Region Of Interest.

self_size specifies the size of this data structure. This value should be set to sizeof(AVRegionOfInterest). EINVAL is returned if self_size is zero.

Number of pixels to discard from the top/bottom/left/right border of the frame to obtain the region of interest of the frame. They are encoder dependent and will be extended internally if the codec requires an alignment. If the regions overlap, the last value in the list will be used.

qoffset is quant offset, and base rule here: returns EINVAL if AVRational.den is zero. the value (num/den) range is [-1.0, 1.0], clamp to +-1.0 if out of range. 0 means no picture quality change, negative offset asks for better quality (and the best with value -1.0), positive offset asks for worse quality (and the worst with value 1.0). How to explain/implement the different quilaity requirement is encoder dependent.

The documentation for this struct was generated from the following file:

libavutil/frame.h

Public Attributes

Detailed Description