LTX 2 Improve `encode_video` by Accepting More Input Types (#13057)
* Support different pipeline outputs for LTX 2 encode_video
* Update examples to use improved encode_video function
* Fix comment
* Address review comments
* make style and make quality
* Have non-iterator video inputs respect video_chunks_number
* make style and make quality
* Add warning when encode_video receives a non-denormalized np.ndarray
* make style and make quality
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>