Abstract: The invention concerns a method of video encoding comprising: determining a first ratio (IPRATIO) based on previously encoded picture frames of a video sequence comprising one or more intra-coded pictures (I) and one or more predicted pictures (P), the first ratio (IPRATIO) being calculated based on the ratio between the size of one or more previously encoded intra-coded pictures and the size of one or more previously encoded predicted pictures; and determining a quantization parameter (QP) to be applied to a frame to be encoded based on the first ratio (IPRATIO).

Abstract: The invention concerns a test stream generator for generating a compressed video stream for testing a video decoder, the generator including: a context-aware pseudo-random generator (202) adapted to generate pseudo-random values of syntax elements based on decoding context data; a decoding process module (206, 206?) adapted to process the syntax element values and to generate the decoding context data and binarization context data; and a binarizer module (204) adapted to encode the syntax element values based on the binarization context data in order to generate the compressed video stream.

Abstract: The invention concerns a method comprising: encoding, by a video encoder and based on a first quantization factor (QP), one or more first groups of image blocks of a video frame; estimating, by a processing device, the size of an image slice comprising a plurality of further groups of image blocks to be encoded; and determining, based on the estimated size of the image slice, a second quantization factor (QP) to be applied to one or more of the further groups.

Abstract: The invention concerns a method of video encoding comprising: determining a first ratio (IPRATIO) based on previously encoded picture frames of a video sequence comprising one or more intra-coded pictures (I) and one or more predicted pictures (P), the first ratio (IPRATIO) being calculated based on the ratio between the size of one or more previously encoded intra-coded pictures and the size of one or more previously encoded predicted pictures; and determining a quantization parameter (QP) to be applied to a frame to be encoded based on the first ratio (IPRATIO).

Abstract: The invention concerns a method comprising: encoding, by a video encoder and based on a first quantization factor (QP), one or more first groups of image blocks of a video frame; estimating, by a processing device, the size of an image slice comprising a plurality of further groups of image blocks to be encoded; and determining, based on the estimated size of the image slice, a second quantization factor (QP) to be applied to one or more of the further groups.

Abstract: The invention concerns a test stream generator for generating a compressed video stream for testing a video decoder, the generator including: a context-aware pseudo-random generator (202) adapted to generate pseudo-random values of syntax elements based on decoding context data; a decoding process module (206, 206?) adapted to process the syntax element values and to generate the decoding context data and binarization context data; and a binarizer module (204) adapted to encode the syntax element values based on the binarization context data in order to generate the compressed video stream.