Hi, Ross. When developing a client application to display the rtsp
stream, I ran into a problem when decoding h264 stream. As I am using
ffmpeg decoder. I get a SDP description, parses on the SPS and PPS nal
units, adding start codes and direct input to the decoder. Each received
nal unit I also add a start code. Stream is decoded without any
problems, and I get the appropriate shots, but on some h264 streams
arise judder. When decoding jpeg and mpeg4 streams such jerks not.
First, I have sinned in the decoder, but it turned out that this decoder
packages sometimes come with a noticeable delay. The delay occurs when
receiving IDR frames (nal unit type 5). Although no presentation time
delay. Since SPS and PPS nal units are not useful frames, the difference
in time between the IDR frame and the frame normally reaches almost
two-fold increase on the match against the usual interval. This presents
a judder. It is worth noting that the VLC player plays the stream
without jerks.
Here is my log output in the first column of the type of unit, the
second real time between two packets in milliseconds, in the third - the
difference between the presentation times in microseconds:
[URL:"rtsp://192.168.33.77/yard(road).264/"]: Got a SDP description:
v=0
o=- 1375685540786756 1 IN IP4 192.168.33.77
s=H.264 Video, streamed by the LIVE555 Media Server
i=yard(road).264
t=0 0
a=tool:LIVE555 Streaming Media v2013.03.31
a=type:broadcast
a=control:*
a=range:npt=0-
a=x-qt-text-nam:H.264 Video, streamed by the LIVE555 Media Server
a=x-qt-text-inf:yard(road).264
m=video 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:500
a=rtpmap:96 H264/90000
a=fmtp:96
packetization-mode=1;profile-level-id=42C01E;sprop-parameter-sets=Z0LA
HqtAWAk2AiAAAAMAIAAABlHixdQ=,aM4yyA==
a=control:track1
[URL:"rtsp://192.168.33.77/yard(road).264/"]: Initiated the "video/H264"
subsess
ion (client ports 52996-52997)
[URL:"rtsp://192.168.33.77/yard(road).264/"]: Set up the "video/H264"
subsession
(client ports 52996-52997)
[URL:"rtsp://192.168.33.77/yard(road).264/"]: Created a data sink for
the "video
/H264" subsession
[URL:"rtsp://192.168.33.77/yard(road).264/"]: Started playing session...
nal type 6 real time 0 presentation time 0
nal type 7 real time 1 presentation time 0
nal type 8 real time 0 presentation time 0
nal type 5 real time 42 presentation time 0
nal type 1 real time 1 presentation time 40000
nal type 1 real time 37 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 79 presentation time 40000
nal type 1 real time 2 presentation time 40000
nal type 7 real time 38 presentation time 40000
nal type 8 real time 1 presentation time 0
nal type 5 real time 44 presentation time 0
nal type 1 real time 1 presentation time 40000
nal type 1 real time 34 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 80 presentation time 40000
nal type 1 real time 1 presentation time 40000
nal type 7 real time 40 presentation time 40000
nal type 8 real time 1 presentation time 0
nal type 5 real time 45 presentation time 0
nal type 1 real time 1 presentation time 40000
nal type 1 real time 33 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 7 real time 40 presentation time 39988
nal type 8 real time 1 presentation time 0
nal type 5 real time 44 presentation time 0
nal type 1 real time 1 presentation time 40000
nal type 1 real time 33 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 7 real time 40 presentation time 40000
nal type 8 real time 2 presentation time 0
nal type 5 real time 44 presentation time 0
nal type 1 real time 0 presentation time 40000
nal type 1 real time 34 presentation time 40000
nal type 1 real time 41 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 39 presentation time 40000
nal type 7 real time 40 presentation time 40000
nal type 8 real time 2 presentation time 0
nal type 5 real time 41 presentation time 0
nal type 1 real time 0 presentation time 40000
nal type 1 real time 37 presentation time 40000
nal type 1 real time 41 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 37334
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 39 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 7 real time 40 presentation time 40000
nal type 8 real time 1 presentation time 0
nal type 5 real time 45 presentation time 0
nal type 1 real time 0 presentation time 40000
nal type 1 real time 34 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 41 presentation time 40000
nal type 7 real time 40 presentation time 40000
nal type 8 real time 1 presentation time 0
nal type 5 real time 45 presentation time 0
nal type 1 real time 1 presentation time 40000
nal type 1 real time 33 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 7 real time 40 presentation time 40000
nal type 8 real time 1 presentation time 0
nal type 5 real time 43 presentation time 0
nal type 1 real time 1 presentation time 40000
nal type 1 real time 34 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 39988
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 7 real time 40 presentation time 40000
nal type 8 real time 1 presentation time 0
nal type 5 real time 44 presentation time 0
nal type 1 real time 1 presentation time 40000
nal type 1 real time 35 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
nal type 1 real time 40 presentation time 40000
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