Hi Ross,
I use LIVE555 to stream video from an H.264 encoder over RTSP/RTP, and I have recently updated my system to support sending multiple slices per frame. Internally, I use my own DeviceSource-based class to feed single NALs to an instance of H264VideoStreamDiscreteFramer, which then feeds either a passive session or an on-demand session. I was watching the RTP data in Wireshark and I noticed that the RTP marker-bit is being set for each slice of each frame. This is normal, according to the code in H264or5VideoStreamDiscreteFramer::afterGettingFrame1 that sets the marker bit based on isVCL(). Some clients handle this fine, but QuickTime does not, and I would like to support QuickTime. For testing, I verified that QuickTime will play the stream fine if I set the marker bit only on the last slice of each frame. My DeviceSource-based class knows when it is sending the last slice of each frame, but naturally the H264VideoStreamDiscreteFramer does not have any way to access this information. Would you be amenable to a patch that added a hook to H264or5VideoStreamDiscreteFramer (or H264or5VideoStreamFramer), which would allow a subclass to specify whether the RTP marker bit should be set? The default implementation would just return isVCL(...), and my derived class would access the out of band information I have for each frame when deciding if the marker bit should be set or not. Thanks for your time, Chris Richardson WTI
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