> On Jun 4, 2018, at 2:11 AM, JEBARAJ SELVAPETER <jeba...@tonboimaging.com> > wrote: > > Hi, > I have been using live555 for streaming. Now I am looking in to the > possibility of adding KLV metadata for every H264 video frame and then > streaming. My question is, > > 1. Is live555 supports KLV metadta with video frames?
Yes. The "RTP Payload Format" for ‘KLV metadata’ is defined in RFC 6597 <https://tools.ietf.org/html/rfc6597>, which we can implement (when transmitting) using the “SimpleRTPSink” class. (RTP receivers can also implement this payload format, using the “SimpleRTPSource” class.) Specifically: I assume that you have a “FramedSource” subclass that delivers - in real time - individual “KLVunits” (i.e., one “KLVunit” at a time), each with an appropriate “presentationTime” (aligned with ‘wall-clock time’, i.e., the time that you’d get by calling “gettimeofday()”). I assume also that you’re familiar with <http://live555.com/liveMedia/faq.html#liveInput-unicast>, and, in particular, that you know how to define a subclass of “OnDemandServerMediaSubsession” for ‘KLV metadata’, including reimplementing the “createStreamSource()” and “createNewRTPSink()” virtual functions. Your “createNewRTPSink()” implementation would then implement this RTP payload format as follows: RTPSink* YourOnDemandServerMediaSubsessionSubclassForKLVMetadata ::createNewRTPSink(Groupsock* rtpGroupsock, unsigned char rtpPayloadTypeIfDynamic, FramedSource* /*inputSource*/) { return SimpleRTPSink::createNew(envir(), rtpGroupsock, rtpPayloadTypeIfDynamic, 90000, // rtpTimestampFrequency “application”, // sdpMediaTypeString, “smpte336m”, // rtpPayloadFormatName, 1, // numChannels, 0, // allowMultipleFramesPerPacket 1 // doNormalMBitRule (see the comments in “liveMedia/include/SimpleRTPSink.hh”) ); } Similarly, you could implement a RTP *receiver* for this stream with code something like: SimpleRTPSource::createNew(*env, &rtpGroupsock, rtpPayloadFormatCode, 90000, // rtpTimestampFrequency “application/smpte336m” // mimeTypeString 0, // offset 1 // doNormalMBitRule ); Ross Finlayson Live Networks, Inc. http://www.live555.com/ _______________________________________________ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
