When using php to upload a video file, only the sound is played.

Upload a video file in php and download the file by passing the hash to get a link address. Open this link address, and only the sound and no image are displayed in the video. How can I adjust it? 7xrvvj.com1.z0.glb.clouddn.com20160315-164432-9420.8.mp4 uploads a video file using php and downloads the file by passing the hash to obtain a link address. When you open this link address, only the audio image is displayed. How can I adjust it?
Http://7xrvvj.com1.z0.glb.clouddn.com/20160315-164432-941278.mp4

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Upload a video file in php and download the file by passing the hash to get a link address. Open this link address, and only the sound and no image are displayed in the video. How can I adjust it?
Http://7xrvvj.com1.z0.glb.clouddn.com/20160315-164432-941278.mp4

Isn't there a problem with video files?

No problem. I used Chrome version 49.0.2623.75 to open it normally, with sound.

This should have nothing to do with PHP, but it should be because the audio file MP4 itself has a problem. If the video tag of HTML 5 is used for Embedded page playback, we recommend that you convert the MP4 format encoding to AVC (H264.

Format Factory

Does the original video file have images? It should be about mp4 encoding.