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What is Metadata
Simply put, it is data about data. For example, a piece
of paper contains data for 10 lines. Of these, five lines
are in bold and five lines are normal. Again, total number
of capital letters is twenty. So here is how a metadata for
this paper will look like:
Total lines: 10
Bold: 5
Normal: 5
Capital letters: 20
Now if the above data is pasted on top of the paper, it will
be a metadata of the paper. Simple.
FLV Metadata
In this case, the information that composes an FLV file
is the data, and the metadata is information about that video.
The length of the video (duration), the number of frames per
second that the video displays (frame rate), and the number
of kilobytes of data transferred per second when the video
plays (video and audio data rates, where applicable) are all
examples of video metadata. Additionally, the codec used to
encode the video is also available.
Importance of FLV Metadata
Most FLV players read the metadata first to know the duration
of the video file. After that it initializes or synchronizes
the video file with its timeline or seekbar. If there is no
metadata the seekbar will not progress with the video. Secondly,
for more intelligent FLV players that serve the video or rather
buffer the video dynamically, depending on the user’s internet
speed, the FLV players read the FLV video bitrate from the
FLV metadata and then sets the buffer accordingly.
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