typedef struct AVFrame {
...
/**
* width and height of the video frame
*/
int width, height;
...
/**
* 1 -> keyframe, 0-> not
*/
int key_frame;
/**
* Picture type of the frame.
*/
enum AVPictureType pict_type;
...
}
通过key_frame判断是否为关键帧。或者 enum AVPictureType pict_type;也行。
AVPictureType的定义如下:
/**
* @}
* @}
* @defgroup lavu_picture Image related
*
* AVPicture types, pixel formats and basic image planes manipulation.
*
* @{
*/
enum AVPictureType {
AV_PICTURE_TYPE_NONE = 0, ///< Undefined
AV_PICTURE_TYPE_I, ///< Intra
AV_PICTURE_TYPE_P, ///< Predicted
AV_PICTURE_TYPE_B, ///< Bi-dir predicted
AV_PICTURE_TYPE_S, ///< S(GMC)-VOP MPEG-4
AV_PICTURE_TYPE_SI, ///< Switching Intra
AV_PICTURE_TYPE_SP, ///< Switching Predicted
AV_PICTURE_TYPE_BI, ///< BI type
};
AVFrame *decoded_frame;
int is_key_frame = (decoded_frame->key_frame == 1)
|| (decoded_frame->pict_type == AV_PICTURE_TYPE_I);
...
不过，感觉key_frame 好像不太准， AVPictureType pict_type感觉更准一些
