Extract automatic captions from YouTube video

Question

I\'m having problems extracting automatic captions from YouTube videos.

I tried using the http://video.google.com/timedtext?type=track&v=3wszM2SA12E&name=Au

Answer 1

I was taking a look at downsub.com and found the following API call which seems to work for automatically generated captions:

https://www.youtube.com/api/timedtext?expire=1491547251&v=YD1tc8lRsdQ&sparams=asr_langs%2Ccaps%2Cv%2Cexpire&hl=en_US&signature=6241BAB9F7E9DB164AFE496B40B4DA4B58B463FD.D7FEC5B2CC81721AF9928215343509E280FEF6BD&asr_langs=pt%2Cit%2Ces%2Cru%2Cfr%2Cko%2Cde%2Cja%2Cnl%2Cen&key=yttt1&caps=asr&kind=asr&lang=en