The text of video lectures has been obtained through manual processes and is therefore error-prone. There is no claim to accuracy on the text content provided in this site. We are working with many professors to correct their lecture transcripts so that they can become both verbatim transcripts as well as readable text help for those who have bandwidth limitations and cannot download full video courses. An audio file (mp3 format) is provided as download along with the transcript of each file. The transcribed files given as pdf are also being used to provide subtitles to the video (in English) and can be used in the future for providing local language translations. Please see the subtitles in the NPTEL website.
The text will be used to create metadata and search index and the time coding on the video will be used to provide markers on the video for easy search of the video content. These are activities in progress. The project to provide transcription of all videos published by NPTEL (currently more than 11,500 hours and will likely swell to about 20,000 hours in a year or so) is an on-going project and delays are unavoidable.
We will do our best to speed up but kindly bear with us for delays and mistakes.