I have an idea for intermediate language learners who want to improve their languages skills by using video on youtube. Learners could improve listening skill by watching videos in target language. If the videos are provided with subtitles or associated with closed caption (auto-generated), then it is amazing. The learners in intermediate level could check out the transcript or closed caption after listening some times. However, it is impossible to get feedback whether learners could understand videos well or not when there is neither subtitle nor closed caption.
My question is how to force youtube to create a closed caption (auto-generated) when one uploads a video on their own youtube channel.