![](bg4.png)
Generates the multiplexed AVI file.
The audio and video extraction process from the
normal video frames is shown in Figure 6 whose
steps are given below:
Synchronization to pilot symbols
Extraction of frame ID
Extraction of audio ID and language ID
Extraction of encoded audio bits if the audio
corresponds to the desired tutorial selected by
the user
Extraction of the video pixels if that
corresponds to the desired tutorial selected by
the user
Encoding of the video to H.264
Encoded audio and video is multiplexed to store
the same in local hard-disk for future consumption
by the user.
Figure 6: Extraction process of metadata, audio and video
in normal video frame.
4 CONCLUSIONS
In this paper we propose multiplexing multiple
tutorials in spatial and temporal domain to support
lot more tutorials in a single TV channel to support
distance education using a low cost client HIP box.
The degree of multiplexing will depend on the cost
of each tutorial to broadcast. To extract and play
back the required tutorial it requires some metadata
information and these metadata are inserted as part
of the analog video frame. This metadata includes
pilot pattern, tutorial information and QA. The
encoded audio for multiple tutorials are also inserted
as metadata into analog video frame. The
acceptability of multiplexing multiple tutorials in
spatial and temporal domain depends on the trade-
off between bandwidth and video quality which
needs to be further analyzed.
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