I want to specify a language in the embed code to auto-translate the captions for languages that I do not have a caption entered. It will base it from my default language caption. This is so I will not need to manually translate the captions for each language I want to supports. Curranty the only way to get auto-translation of captions is to make the user select the auto-translate language through the UI. Embed parameters cc_lang_pref and cc_load_policy only work when the channel owner as uploaded or create a specific language.
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