> テレビをつけたら、昔見た映画をやっていた。

Can someone explain what the やっていた means in this context?

1 - At the time when I turned on the TV, an old movie that I already watched
was playing?

or

2 - At the time when I turned on the TV, an old movie that I already watched I
watched it again?
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meaning
テレビをつけたら、昔見た映画をやっていた。
Your first interpretation is correct. This やる is 演る{やる}. See
[here](https://jisho.org/search/%E6%BC%94%E3%82%8B):

> to perform; to play; to act  
>  ​See also 演じる, often used in the popular music industry

I think it usually occurs in kana, as opposed to kanji.
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In this context, やっていた translates as 'was playing' or 'was on (TV)'.

By the way, since 昔 is modifying 見た and not 映画 directly, it is not the movie
that is being described as old, but rather when the action of viewing it
happened. Then again, if it was a long time ago then the movie also has to be
old. But technically speaking, I think this would be better:

> テレビをつけたら、昔見た映画をやっていた。  
>  When I turned on the TV, there was a movie on that I had seen a long time
> ago.
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Let me provide an answer from a bit different angle from the other two.

This sentence pattern `〜たら〜ていた` is used when you say that you found something
in a particular state when you did something. It must be describing some kind
of state, rather than a one-time action, because the verb of the main clause,
やる in your example, is used in the ている form. Unless you happen to find
yourself in a state of unconsciously doing something with a movie the moment
you turn on the TV, this verb must be referring to an act by someone else.

So, your first interpretation is the correct one.
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