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--></style><title>Re: [Live-devel] Parser and
Framer</title></head><body>
<blockquote type="cite" cite><font face="Arial" size="-1">I have some
enquiries regarding parser and framer function.</font></blockquote>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1">A parser is
used when the video/ audio data is a file and to split the data into
frames. If the encoder produces frames directly instead of writing to
a file, the parser can be skipped when streaming. Is this
true?</font></blockquote>
<div><br></div>
<div>Yes. This is the purpose of
"MPEG1or2VideoStreamDiscreteFramer" and
"MPEG4VideoStreamDiscreteFramer", for example. (In
practice, these classes will do a small amount of 'parsing' within
each frame, to get timing information that's used to compute
presentation times. See the *DiscreteFramer classes for examples
of this. However, they won't need to do any parsing to actually
find the start and end of each frame; that information is already
given to them.</div>
<div><br></div>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1">A framer is
to frame the frames produced by the encoder such that they contained
information like fFramesize, fPresentationTime. Is this
true.</font></blockquote>
<div><br></div>
<div>Yes.</div>
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</pre></x-sigsep>
<div><br>
Ross Finlayson<br>
Live Networks, Inc.<br>
http://www.live555.com/</div>
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