Python communicate with omxplayer

Question

I want to know when omxplayer starts playing a live stream link. Some time this takes 4-5 second some times 6-7 second.

When I execute os.system('omxplayer '+url), I immediately get the following message:

no xset in (/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)
which: no xrefresh in (/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)

then when the live stream starts (after 5-7 second), I get:

Video codec omx-h264 width 1280 height 720 profile 578 fps 25.000000
Audio codec aac channels 2 samplerate 44100 bitspersample 16
Subtitle count: 0, state: off, index: 1, delay: 0
V:PortSettingsChanged: [email protected] interlace:0 deinterlace:0 anaglyph:0 par:1.00 layer:0 alpha:255

I am trying to get the second message via subprocess. But I never get it. How can I get the second message or how can I know when omxplayer start working?

Thanks

#!/usr/bin/python2

import sys, os, time
from subprocess import PIPE, Popen


url="http://livestreamlink.m3u8"


def Main():
    proc=Popen(['omxplayer',url], stdout=PIPE)
    time.sleep(5)
    print proc.communicate()[0]


if __name__ == "__main__":
    Main()

Answer 1

try this:

proc=Popen(['omxplayer',url], stdout=PIPE, stderr=PIPE)
print proc.communicate()   # remove [0]