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Full Discussion: Function to get the duration of all videos in a folder(s)
Top Forums Shell Programming and Scripting Function to get the duration of all videos in a folder(s) Post 303016240 by RudiC on Monday 23rd of April 2018 05:39:16 AM
Old 04-23-2018
That is a variation of bash's "here documents": "here strings". This contruct evaluates the expression after the <<< and presents the result on stdin of the (here: read) command.
I don't know about exiftool nor do I have access to it, so simulated it with a cat of several files with integer numbers, trying to condense most of your script into the following three lines:
Code:
shopt -s extglob
IFS=: read DAYS HRS MIN SEC <<< $(printf "%(%j:%T)T" $(( $(cat *.@(avi|mp4|mkv) | tr '\n' '+' ) 0 )) )
echo $(( --DAYS)) $((--HRS)) $MIN $SEC
0 00 23 30

Here you have
- a here string to read the time elements from the result of printf
- a printf converting seconds to Day, Hour, Minute, and Second (using the "epoch" seconds; day and hour will start at 1 so have to be decremented for later use)
- an "extended pattern matching" for the video files in the working directory (use exiftool in lieu of cat for your purposes)
- shell "Arithmetic Expansion" $(( ... ))

The use of the extended pattern matching may be limited by sheer file count resp. file names' lengths, should they exceed the ARG_MAX or LINE_MAX system parameters...
Last edited by RudiC; 04-23-2018 at 07:33 AM..
This User Gave Thanks to RudiC For This Post:
zouhair
 

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LEARN ABOUT X11R4

new

NEW(1)                                                               [nmh-1.5]                                                              NEW(1)

NAME

       new - report on folders with new messages

       fnext - set current folder to next folder with new messages

       fprev - set current folder to previous folder with new messages

       unseen - scan new messages in all folders with new messages

SYNOPSIS

       new [sequences] [-mode mode] [-folders foldersfile] [-version] [-help]

       fnext is equivalent to new -mode fnext

       fprev is equivalent to new -mode fprev

       unseen is equivalent to new -mode unseen

DESCRIPTION

       New  in  its  default  mode  produces  a  one-line-per-folder  listing of all folders containing messages in the listed sequences or in the
       sequences listed in the profile entry "Unseen-Sequence".  Each line contains the folder, the number of messages in the  desired  sequences,
       and the message lists from the .mh_sequences file.  For example:

            foo     11.* 40-50
            bar    380.  760-772 824-828
             total    391.

       The `*' on foo indicates that it is the current folder.  The last line shows the total number of messages in the desired sequences.

       New crawls the folder hierarchy recursively to find all folders, and prints them in lexicographic order.  Override this behavior by provid-
       ing foldersfile containing the pre-sorted list of folders new should check, one per line.

       In fnext and fprev modes, new instead changes to the next or previous matching folder, respectively.

       In unseen mode, new executes scan sequences for each matching folder.

FILES

       $HOME/.mh_profile          The user profile

PROFILE COMPONENTS

       Path:                To determine the user's nmh directory
       Current-Folder:      To find the default current folder
       Unseen-Sequence:     The name of the unseen message sequence

SEE ALSO

       scan(1), mh-format(5)

HISTORY

       Based on Luke Mewburn's new (http://www.mewburn.net/luke/src/new).

MH.6.8                                                             11 June 2012                                                             NEW(1)
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