Getting the free services is not right for all types of needs. If you are looking to transcribe the video into text of other formats freely you need to be very cautious, as any kind of manipulation or missing part can change the sense of words or entire sentence communicated into the video.

If you are looking for fun or need the content for unofficial work, you can find many free tools and online services providing the video to audio or text transcription work. Just upload the video file and wait for the conversion, and once done go ahead but you don’t know how accurate is the transcription and what is the privacy and security of your video files or contents.Source