[Bug 729061] New: Pipeline ported from 0.10 to 1.0 seems to limit packets

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=729061
  GStreamer | don't know | 1.2.3

           Summary: Pipeline ported from 0.10 to 1.0 seems to limit
                    packets
    Classification: Platform
           Product: GStreamer
           Version: 1.2.3
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: pev at sketchymonkey.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I have a pair of pipelines from 0.10 that have issues under 1.0. To replicate,
use the following : 

System information : 

I've tested using the following gstreamer versions (distributed via Ubuntu
14.04) :
  gst-launch-0.10 version 0.10.36
  gst-launch-1.0 version 1.2.3

The tests were performed on on a HP z600 Dual Quad-Xeon with 24GB ram (speedy!)
using the on-board BCM5764M gigabit ethernet (eth0) on a netgear ethernet
switch with the following multicast route configured :
  route add -net 224.0.0.0 netmask 240.0.0.0 eth0

Common config  : 

  export MULTICAST_ADDR=239.192.1.254
  export PORT=5004
  export WIDTH=1024
  export HEIGHT=768

Send using GStreamer 0.10 :

  gst-launch-0.10 videotestsrc ! \
    "video/x-raw-yuv,framerate=30/1,width=$WIDTH,height=$HEIGHT" ! \
    queue ! rtpvrawpay ! udpsink host=$MULTICAST_ADDR port=$PORT
auto-multicast=true

Send using GStreamer 1.0 :

  gst-launch-1.0 videotestsrc  ! \
    "video/x-raw,format=UYVY,framerate=30/1,width=$WIDTH,height=$HEIGHT" ! \
    queue ! rtpvrawpay ! udpsink host=$MULTICAST_ADDR port=$PORT
auto-multicast=true

Note that the only changes are changing from : 
  video/x-raw-yuv
to : 
  video/x-raw,format=UYVY
as suggested.

In essence the bug is that the stream in 0.01 streams at 30fps as expected but
in 1.0 it drops to around 18fps. You can verify this by executing the following
loop in another terminal : 

while true; do \
        T1=`cat /sys/class/net/eth0/statistics/tx_packets` ; \
        sleep 1; \
        T2=`cat /sys/class/net/eth0/statistics/tx_packets` ; \
        TXPPS=`expr $T2 - $T1` ; \
        echo "tx $1: $TXPPS pkts/s" ; \
done

Note : The above is obviously assuming you're using a dedicated ethernet
interface for the multicasting with no additional traffic on it!

On my machine this produces : 
  0.10 TX : average 34,350 pkt/s  +/- 50
  1.0  TX : average 22,900 pkt/s  +/- 1000

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