ITU-T REC. H.261 CODEC FOR AUDIOVISUAL SERVICES AT n x 384 kbit/s
1 Scope
2 Brief specification
    2.1 Video input and output
    2.2 Digital output and input
    2.3 Sampling frequency
    2.4 Source coding algorithm
    2.5 Audio channel
    2.6 Data channels
    2.7 Symmetry of transmission
    2.8 Error handling
    2.9 Propagation delay
    2.10 Additional facilities
3 Source coder
    3.1 Source format
    3.2 Video source coding algorithm
        3.2.1 Prediction
        3.2.2 Motion compensation
        3.2.3 Loop filter
        3.2.4 Transformer
        3.2.5 Quantization
        3.2.6 Clipping
    3.3 Data rate control
    3.4 Forced updating
4 Video multiplex coder
    4.1 Data structure
    4.2 Video multiplex arrangement
        4.2.1 Picture header
        4.2.2 Group of blocks header
        4.2.3 Block data alignment
    4.3 Multipoint considerations
        4.3.1 Freeze picture request
        4.3.2 Fast update request
        4.3.3 Data continuity
5 Vide data buffering
6 Transmission coder
    6.1 Bit rate
    6.2 Video clock justification
    6.3 Frame structure
        6.3.1 Frame structure for 384-1920 kbit/s channels
        6.3.2 Bit assignment in application channel
        6.3.3 Time slot positioning
    6.4 Audio coding
    6.5 Data transmission
    6.6 Error handling
    6.7 Encryption
    6.8 Bit sequence independence restrictions
    6.9 Network interface