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Data Reorganization
Figure 1 shows the data reorganization that we performed
prior to streaming a movie. The ‘idx1’ frame index table,
which is generally located at the end of an AVI file is moved
to the very beginning. The video and audio data that starts
with a ‘RIFF’ four character signature is appended to the
table. No other changes are made to the contents of the file.
Specifically, no internal pointers are changed to match the
new frame locations. The buffer manager logic is designed
to correctly and transparently translate all access locations.
Its operation is described in the next few paragraphs.
For
streaming, one disadvantage ofmoving the frame table to the
beginning of the file is that playback can only start after the
complete table has been received at the client side. However,
Table 1 shows that generally the frame table size is less than
1% of the complete size of a movie and does therefore not
introduce significant startup latencies.
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Added:16:57 25.07.2006
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