What do mP4 bit rate and sampling rate mean?

Bit rate: refers to the number of bits transmitted per second. What is the unit? Bps (bits per second), the higher the bit rate, the faster the data transmission speed. Bit rate in sound refers to the amount of binary data per unit time after analog sound signal is converted into digital sound signal, which is an indirect indicator to measure audio quality. The bit rate (code rate) principle in video is the same as that in sound, which refers to the amount of binary data per unit time after analog signals are converted into digital signals.

For example, audio and video are encoded at 500Kbps.

Where bps is the bit1k =1010 =1024.

B a little.

S is the second.

P is every (every)

Therefore, encoding at 500Kbps means that encoded audio and video data need to be represented at 500k bits per second.

Sampling frequency: Also known as sampling speed or sampling rate, it defines the number of samples taken from continuous signals to form discrete signals per second, expressed in hertz (Hz). The reciprocal of the sampling frequency is the sampling period or sampling time, that is, the time interval between samples. Generally speaking, the sampling frequency refers to how many sound samples are collected by the computer every second, which is the standard to describe the sound quality and timbre of sound files and measure the quality of sound cards and sound files.

The process of converting analog audio into digital audio is called sampling. Simply put, it is how much data is needed to record the sound with the length of 1 second through waveform sampling. A sound with a sampling rate of 44KHz needs 44,000 data to describe the sound waveform of 1 sec. In principle, the higher the sampling rate, the better the sound quality.