Video encoding method and video encoder configured to perform such method

A video encoder configured to encode a series of images of original video data into an encoded video stream, the video encoder is configured to:

• set a periodic intra refresh pattern for the encoding of the series of images of the original video data, wherein the periodic intra refresh pattern defines which region of an intra refresh frame should be forced to be encoded as an intra-coded region, so that all regions of an image are intra refreshed over a set of intra refresh frames in one cycle of the periodic intra refresh pattern;
• set a number of delta frames to be added between consecutive intra refresh frames of the periodic intra refresh pattern, thereby increasing the intra refresh periodicity of the encoded video stream;
• and
• encode the series of images of the original video data into the encoded video stream based on the increased intra refresh periodicity using the set periodic intra refresh pattern and the set number of delta frames, added between consecutive intra refresh frames,
• during the encoding the video encoder is configured to set a current intra refresh frame to refer only to a previous intra refresh frame for prediction,
• during the encoding the video encoder is configured to set each delta frame, added in between two consecutive intra refresh frames, to only directly or indirectly, via one or more of the delta frames added in between the two consecutive intra refresh frames, refer to a previous one of the two consecutive intra refresh frames for prediction.