Video audio playback issue ionic 4

@asrguru wrote:

my ionic app Plays the video and audio file only in blog post

But in the course status video and audio playback flickering and unable to load and play properly
Chrome Inspect console shows : Platform-browser.js error 404 not found

here is the screen shot:

shot.jpg1548×816 264 KB

and here is the video:

please tell me how to fix this

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