[Live-devel] How framerate is passing to rtsp client

[Paweł Domagalski]

Hi all,*
*

*Problem:*

In my case, bit stream coming from h264 encoder which is feed by live 
camera. Bitstream is sending by live555 library using RTSP protocol. 
RTSP packets are received by one of rtsp client like vlc player( the 
most important), totem player, mplayer. I need to know how to set lower 
framerate because my camera produces 9 fps but most of RTSP clients are 
expecting in default 25 fps and it cause that video stream is not played 
properly ( buffered, dropping late packets etc.).


I am using testOnDemandRTSPServer example code from live555. I have 
wrote my implementation of DeviceSource class. I have set presentation 
time properly:

|gettimeofday(&fPresentationTime, NULL); fDurationInMicroseconds = 1100000; |

Sequence Parameter Set NAL also contains proper timing infos:

|timing_info_present_flag : 1 num_units_in_tick : 1001 time_scale : 9000 
fixed_frame_rate_flag : 1|


According to 
http://lists.live555.com/pipermail/live-devel/2010-August/012504.html
I have added to RTSP Header framerate param:

|a=framerate:9.0|


Unfortunately it doesn't help. I have thought that video player will be 
calmly waiting for new frame and framerate will be correlated with 
frequency of receiving another RTP packets (another NALs).

*Question:*

I would like to know how frame rate is read from bit stream (or 
evaluated) by RTSP client (playback software). Where this informations 
are stored and how are sending to playback software?


*More infos:*
http://stackoverflow.com/questions/36332455/how-frame-rate-is-calculated-or-read-from-h264-bitstream-sending-through-rtsp-pr

Best regards

-- 
Paweł Domagalski
Software Engineer
Mobica Ltd.
www.mobica.com

Mobica is a provider of innovative, cutting-edge software engineering, testing and consultancy services. Based in the UK, Poland, the USA and Mexico, Mobica has a worldwide customer base and a proven track record in delivering complex solutions to global leaders in a range of sectors including automotive, mobile, semiconductor, finance, TV & broadcasting, telecommunications, connected devices, marine and aviation.

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