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1

How to auto restart a command after it closes down?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 2587 / 3 Years ago, sun, september 26, 2021, 12:21:54

I am using rtmpdump to restream live video on my local network on nginx rtmp server. like this:

sudo rtmpdump -r "rtmp://123.45.6.7/live/" -a "live/" -f "LNX 14,0,0,125" -W "http://123.45.6.7/jwplayer.flash.swf[1] " -p "http://123.45.6.7/[2] " --live -y "livestream2" | avconv -i pipe:0 -y

-v:v info -vcodec copy -acodec copy -f flv rtmp://localhost:1935/live/

it works great on its own with no problem but once in a while the original source might flicker and it will cause the running command to quit, and I have to manually run the command again. Is there a way to make a script which will automatically detect if rtmpdump quit and there is no zombie command running and rerun the command?
I want to automate this process for about 4 live streams. Is it possible?

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peafowkes

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3 Years ago

answered 3 Years ago tocklftime · Accepted Answer

You could write a script with these contents:

#! /bin/bash

function INT_cleanup()

{

    kill `jobs -p`

    exit

}



trap INT_cleanup INT



# ${VAR-TEXT} means that TEXT is used if VAR is empty.



STREAM_START=$(($1))

STREAM_END=$(($2))

for ((COUNT=STREAM_START; COUNT<=STREAM_END;COUNT++))

do

    while true #Infinite loop

    do

        rtmpdump -r "rtmp://123.45.6.7/live/" -a "live/" -f "LNX 14,0,0,125" -W 

            "http://123.45.6.7/jwplayer.flash.swf[1] " 

            -p "http://123.45.6.7/[2] " --live -y "livestream$COUNT" | 

        avconv -i pipe:0 -y -v:v info -vcodec copy 

            -acodec copy -f flv rtmp://localhost:1935/live$COUNT/

    done &

done

Or

#! /bin/bash

function INT_cleanup()

{

    kill `jobs -p`

    exit

}



trap INT_cleanup INT



count=0

while [[ $count < 10 ]] # Try 10 times

do

    rtmpdump -r "rtmp://123.45.6.7/live/" -a "live/" -f "LNX 14,0,0,125" -W "http://123.45.6.7/jwplayer.flash.swf[1] " -p "http://123.45.6.7/[2] " --live -y "livestream2" | avconv -i pipe:0 -y -v:v info -vcodec copy -acodec copy -f flv rtmp://localhost:1935/live/

    count=$((count + 1))

done

in a file, call it stream.sh, make it executable:

chmod +x stream.sh

and run it:

sudo ./stream.sh 1 3

To kill the script, press CtrlC. The first is an infinite loop, the second runs for 10 iterations.