[Live-devel] Question About PAT/PMT in MPEG2

[Jeff Shanab]

If you are using the HTTP Live Streaming that depends on the MPEG-2 Transport Stream, I implemented this on live cameras by gorilla subclassing (Cut-n-paste and modify) the MPEG2TransportStreamFromESSource  to a MPEG2TransportStreamFromESSource4iOS class. I changed the inserting of the PAT and PMT to be relative to a chosen number of keyframes instead of a random time so I could easily segment it on the fly downstream.

HLS on ios is extreamly picky about the segment size and what it starts with. While it must have recieved at least once in the past, I start each segment with it and a keyframe to allow connections at any time.
________________________________
From: live-devel-bounces at ns.live555.com [live-devel-bounces at ns.live555.com] on behalf of Ross Finlayson [finlayson at live555.com]
Sent: Thursday, January 24, 2013 7:00 PM
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] Question About PAT/PMT in MPEG2

I'm building and iOS application, where I'm using a RTSP Client (based on testRTSPClient) to receive a MPEG2 stream

Because you refer to "PAT" and "PMT" information, I assume you're referring to a MPEG-2 *Transport* stream.  (There are other kinds of MPEG-2 streams as well.)


and then I'm trying to decode the frames with help of FFMPEG. My question is: Is it possible to obtain the PAT and PMT information  before I  pass the frames to FFMPEG with help of the live555 library, or does the live555 library has nothing to do with this task and it should be handle by FFMPEG?

The latter.  When the RTSP/RTP client receives the MPEG Transport Stream data, it doesn't inspect its contents at all.  So your decoder will need to do that.

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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