The video file cached by Zhu Longshe is in PCM format, and the general player does not support the video decoding in PCM format. You can convert the video format into the commonly used MP4 format for playback, or you can directly open my cache for playback in Zhulongshe APP. Zhu Long Institute is a mobile phone learning software specially developed for people who want to engage in the construction industry. There are many famous teachers explaining videos in the software to help newcomers get started quickly and learn easily.