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Full Discussion: While read pipe input issue
Top Forums Shell Programming and Scripting While read pipe input issue Post 303003231 by baris35 on Sunday 10th of September 2017 11:39:20 AM
Old 09-10-2017
While read pipe input issue
Hello,
I have an ffmpeg bash script which is working nice and
I need to do the same for other sources.
To create new scripts and to deal with multiple bash files sounds not logical. It is a bit hard to manage for me..
I wondered if it was possible to make my input file as variable.
Then I wrote below scripts to make it shorter


This one works as expected.
working_nice_one.sh
Code:
#!/bin/bash

while read line
do

/usr/bin/ffmpeg -loglevel quiet -re -y -reconnect_delay_max 2 -timeout 1600000 \
-i $line -c copy -f mpegts pipe:1 </dev/null

done < myfile

myfile
Code:
http://xx.yy.zz
http://aa.bb.cc
http://11.22.33

I call the script this way: (this is what I do not prefer)
Code:
pipe:///home/working_nice_one.sh

When the first source goes down, it runs the second source promptly, etc..
At the end of the loop, it goes back to first url line once again. That is good..

Below one is working just for the first line of myfile source. Not looping for some reason. I really dont understand why this is happening.


it_works_but_not_loop.sh
Code:
#!/bin/bash

while read line
do

/usr/bin/ffmpeg -loglevel quiet -re -y -reconnect_delay_max 2 -timeout 1600000 \
-i $line -c copy -f mpegts pipe:1 </dev/null

done < "$1"


I call the script this way: (what I wish to accomplish)
Code:
pipe:///home/it_works_but_not_loop.sh myfile


Could you please explain why the second one is not looping and reading only the first line of my source file? I am scratching my hairs

Thanks
Boris
 

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LEARN ABOUT HPUX

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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