The sound and picture are out of sync. The reason is that audio signal processing is faster, while video signal processing is slower. Therefore, there is an ultrasonic delay line in the color TV, which is used to "wait" the audio signal to the image and synchronize them. In-vehicle DVD generally uses embedded system software to decompress the media stream, which also has this problem. The computer can set the sound delay time in the playback software, but the car DVD can't. ...