Video quality degradation

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Hello, recently I have start using gst and run in some problematic situations. I use gst to play a video and use this 

$this->capture_handle = popen(' gst-launch-0.10 -m -v udpsrc port=9078  ! "application/x-rtp, media=video, payload=102, encoding-name=H264" ! rtph264depay ! ffdec_h264 ! ffmpegcolorspace  ! avimux ! filesink #location=test.avi', "r");

However some videos have terrible quality (PEVQ calculated it as 1.2 MOS). I looked into wireshark logs to check if there were some packet loss but there weren't. Do anyone know why this could occur? It happens only once per 6-9 videos but I need to know it's source. Maybe some RTP packets are discarded by gst?  
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