So,
I found that as I'm using RTP, a clock rate of 90000Hz must be used. In
some cases cameras specify a different clock rate... but if none is
specified I should be using that one.
My problem now, is that I do get timestamps for the NAL units, but I
don't know the timestamp of my decoded frame... In libav there's two
timestamps dts (decoding timestamp) and pts (presentation timestamp).
Say that for a given decoded frame I sent 4 NAL units to the decoder.
Each one had its presentationTime set by Live555. Which of those times
should I use for my frame if any?
Saludos / Best regards,
*Sergio Basurco*
Coherent Synchro
On 28/09/2017 16:34, Sergio Basurco wrote:
Hi,
My goal is to play an H264 stream that comes from a camera. I am
decoding using libav. According to H264 standard, it is not necessary
to specify the time_scale info in the SDP/SPS.
Everything is working fine, however I need to synchronize playback to
prevent stutters. I am parsing the nal units in my H264Sink, in which
I get a presentationTime (timeval). What I don't have is the timebase
for these timestamps.
From what I can tell, the timebase / time_scale of the timestamps
provided by Live555 must be available somewhere for me to set it to my
decoder. If it's not in the SPS description, how can I retrieve it?
--
Saludos / Best regards,
*Sergio Basurco*
Coherent Synchro
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