Extracting the Audio from Videos Using JAVE - Report Writing IT Assignment Help

Assignment Task:

Problem & Motivation:
Every time we watch a movie we have to search for subtitles, download them and add it manually to the video player. Further, if the sync and quality aren't good, we have to repeat the process. And for other videos such as lectures, conference or informational talks we seldom find subtitles. If the subtitles can be made from the audio content of the videos, it will be very convenient for the users.

Brief code walkthrough:
1. Extracting the audio from videos using JAVE. It is a Java library that is a wrapper around ffmpeg. VideoToAudio class handles the conversion process.
Brief working:
a. Open source and destination files
b. Set AudioAttributes for the output file. Program set to encode audio in 16 kHz, 16 bit mono wav format.
c. Encoder class used for extracting audio from source with AudioAttributes into destination file. Encode () in encoder class takes these 3 parameters and does the extraction procedure.

2. Extracting speech from audio using Sphinx4 Java library. Transcriber class handles audio to text conversion. Brief working:
a. Every speech recognition process requires 4 attributes- the dictionary, language model, acoustic model and speech source.
b. Set dictionary, language model and acoustic model as described in Dataset description.
c. StreamSpeechRecognizer class takes in audio source from a stream for recognition. StreamSpeechRecognizer object is made with earlier set configuration.
d. SpeechResult container is used for holding result of recognition performed by StreamSpeechRecognizer object. The recognition is performed till no more result is obtained from input stream.
e. SpeechResult gives words along with the timestamp in a format used by subtitle files.

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