1. Video quality
Both subjective image quality and objective image quality have corresponding algorithms.
2. Beauty effect
3. Stalling rate, subjective fluency
Some videos are actually not stuck, occasionally pause, or appear to be incoherent, which is subjective fluency.
4. Codec performance and power consumption
5. Audio and video delay
6. Audio and video synchronization rate
It is especially important in the singing scene, if the mouth shape and voice do not match, it will be considered that the person is lip-synching.
7. Subjective sound quality, PESQ (perceived speech quality evaluation), POLQA (perceptual objective quality analysis)
PESQ (Perceptual evaluation of speech quality), that is, the evaluation of sensory speech quality. PESQ is an objective sound quality assessment method based on auditory models. It considers the auditory characteristics of the human ear and uses the auditory perception model to evaluate the voice quality. The evaluation results are closer to the user's call experience, and it has become a mainstream evaluation method for evaluating audio communication systems. The measurement method of PESQ is to send a speech sample from the transmitter, and compare the waveform with the original reference speech sample after the receiver receives the score. The result of the score is the PESQ value. Then compare and give the MOS value according to the MOS correspondence table, the unit is dBQ.