Dynamic text-overlay on live-stream using gst-launch-1.0

[Adam Plocher]

Hello, I apologize if I'm posting this in the wrong place. I've previously
asked this on stackoverflow and never got a response:
http://stackoverflow.com/questions/42128804/polling-a-text-file-and-overlaying-the-result-in-gstreamer

I have a Raspberry Pi with a camera and I'm live streaming that back to
another unit (it's for a baby monitor).  On the same Pi, I have a
temperature sensor that is dumping the current temp to a file every 5
seconds.

*My question: *Is it possible to somehow poll that txt file and update a
text-overlay on the live stream based on the current contents of that file?

I've tried using a filesrc and subparse, and it will grab it initially if I
format the input text file properly, but it doesn't seem to update itself:

gst-launch-1.0 -v \
    filesrc location=/home/pi/temp.txt ! subparse ! txt. rpicamsrc
awb-mode=0 awb-gain-red=1 awb-gain-blue=2 rotation=0 bitrate=820000
preview=false brightness=67 contrast=30 sharpness=40 \
    ! video/x-h264,width=800,height=480,framerate=10/1 \
    ! h264parse ! decodebin ! videoconvert ! clockoverlay
shaded-background=true draw-shadow=true font-desc="Nimbus Mono" \
    ! textoverlay name=txt shaded-background=yes \
    ! omxh264enc control-rate=3 target-bitrate=850000 \
    ! tcpserversink host=0.0.0.0 port=5555 sync=true


The input file looks like this:

1
00:00:00,000 --> 99:59:59,000
69 degrees

Thank you!
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