hi_venc_vui_h264_time_info

Description

Defines the TimeInfo information in the VUI field of an H.264 encoding channel.

Prototype

hi_venc_vui_h264_time_info = {"timing_info_present_flag": timing_info_present_flag,
                              "fixed_frame_rate_flag": fixed_frame_rate_flag,
                              "num_units_in_tick": num_units_in_tick,
                              "time_scale": time_scale}

Members

Member	Description
timing_info_present_flag	Int, flag that indicates whether the clock tick count information in the VUI field takes effect. The value can be 0 (default) or 1. Other parameters in the table are valid only when this flag is set to 1.
fixed_frame_rate_flag	Int. For details, see the H.264 protocol. The value can be 0 or 1 (default).
num_units_in_tick	Int, number of time units elapsed when the clock tick counter is increased by 1. The value must be larger than 0. The default value is 1.
time_scale	Int, number of time units elapsed within one second. The value must be larger than 0. The default value is 60.

Precautions

The clock tick count is used to mark video frame signals. In this H.264 encoder, the video display frame rate can be calculated according to the following formula: display_rate = time_scale/num_units_in_tick/2.
Since the display frame rate is only related to the ratio of time_scale to num_units_in_tick, you are advised to retain the value of num_units_in_tick to 1 during setting, and adjust the display frame rate through the time_scale attribute. At this time, the display_rate = time_scale/2.
The player determines the display frame rate, and can choose not to reference the TimeInfo information.

Parent topic: Video/Image Encoding