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<FONT face=Tahoma size=2><B>From:</B> live-devel-bounces@ns.live555.com
[mailto:live-devel-bounces@ns.live555.com] <B>On Behalf Of </B>Ross
Finlayson<BR><B>Sent:</B> Saturday, March 22, 2008 12:18 AM<BR><B>To:</B>
LIVE555 Streaming Media - development & use<BR><B>Subject:</B> Re:
[Live-devel] Parsing MPEG TS<BR></FONT><BR></DIV>
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<BLOCKQUOTE cite="" type="cite"><FONT face=Arial color=#0000ff size=-1>I'm
trying to acquire a MPEG TS over UDP. But I realized that the MPEGDemux uses a
MPEGProgramStreamParser that's why it won't work.</FONT></BLOCKQUOTE>
<BLOCKQUOTE cite="" type="cite"><FONT face=Arial color=#0000ff size=-1>To the
best of my understanding I don't think there is a MPEG TS parser in
livemedia, is that true?</FONT></BLOCKQUOTE>
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<DIV>The closest thing that we have to a 'MPEG TS parser' is
"MPEG2TransportStreamFramer", which is (quoting the header file):</DIV>
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<DIV>// A filter that passes through (unchanged) chunks that contain an integral
number</DIV>
<DIV>// of MPEG-2 Transport Stream packets, but returning (in
"fDurationInMicroseconds")<BR>// an updated estimate of the time gap between
chunks.</DIV><X-SIGSEP><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2>Ross,</FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff><FONT size=2>I looked at the <FONT color=#000000><FONT color=#0000ff>MPEG2TransportStreamFramer</FONT> <FONT color=#0000ff>implentation but it doesn't meet my requirements. So probably I can try to write my own </FONT></FONT></FONT></FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008></SPAN><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff><FONT size=2><FONT color=#000000><FONT color=#0000ff>"MPEGTransportStreamParser". I think all you need to do is strip out the TS header and pass the PES packet (and its header) to the MPEGDemux.</FONT></FONT></FONT></FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff><FONT size=2><FONT color=#000000><FONT color=#0000ff>If it works I think the following filter hierarchy should work:</FONT></FONT></FONT></FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2>BasicUDPSource --> MPEGDemux (uses MPEG2TransportStreamParser) --> MPEGDemuxedElementaryStream (2 for A/V) </FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2>--> MPEGVideoStreamFramer (for audio: MPEGAudioStreamFramer) --> ByteStreamSink (2, which expect a complete video/audio frame so that </FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2>I can feed them to a decoder).</FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2>Please let me know if this sounds correct?</FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2>pushkar</FONT></SPAN></PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </PRE><PRE><SPAN class=796484519-24032008><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </PRE></BODY></HTML>