Video files in Album or iTunes folder of Local tab can only be played via QuickTime and cannot be transmitted to Smart TV or Chromecast. And the sound effects functions such as DTS Headphone:X, Dolby audio processing is not applied.
However, if you copy video files to Document and play, you can use them.
1

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In the Local tab > Album > Camera Roll
Press and hold down on the file that you want to copy, then tap Copy.

2

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Tap the folder that you want to copy it into.
And press OK.

3

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You can see your file in the Local.

4

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DLNA icon will appear. And you can enjoy your Album’s file via Smart TV or Chromecast.