[gst-devel] Issues with live streaming and udpsrc.

[Ambily N]

Hi,

I am experiencing some issues while using rtp/udp live streaming of TS
encapsulated H.264 stream.

The sender side pipe line is as

 gst-launch filesrc location=gst-launch filesrc location=grandma.qcif.yuv
blocksize=1 ! videoparse format=0 width=176 height=144 ! x264enc
byte-stream=1 ! flutsmux ! rtpmp2tpay ! udpsink host=localhost port=1234.

the receiver side the pipeline is as :

 gst-launch udpsrc port=1234 ! rtpmp2tdepay ! flutsdemux ! ffdec_h264 !
queue ! sdlvideosink

The display is jerky and only I frames fets displayed at the sink.

The observations we have on the issue so far are the following.

 1. The display is fine when we use tcpserversrc at the receiver and
tcpclientsink at the sender.

2.The display is fine if we modify the code of udpsrc and make it a non-live
src.

3.The display is smooth if we start the transmitter side first and thgen
start the receiver.

4.The timestamps of the packets arriving at the sink are the same in both
live and non-live cases but in the live case the packets seems to be late
when compared with current clock time.

5. The qos messages from the sink make the decoder skip to the next I frame
and this continues all the way.

6.The display is fine if we disable the sync property at the sdlvideosink.

7. We tried the pipelin with rtph264pay and depay without TS
encapsulation,which works fine. But in this case also at the sink, the sync
property gets set to false due to invalid timestamp and the display is fine.

8.Other players like VLC plays it well wih the same sender.

Would someone be able to coment on the issue?
Regards
Ambs
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