Android. Uneven sound when watching videos?

When viewing videos through the browser on your phone, then there is a buildup of sound at the beginning of each replica. Noticed, but did not attach any importance to this, thinking it's the video file. But the same video is correct (sound). What could be the reason? Android Lolipop 5.0.1, Opera, chrome.
PS. The video tried to download and watch the same thing
July 9th 19 at 13:31
1 answer
July 9th 19 at 13:33
I would recommend to read the topic on your model of smartphone on the forum site

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