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POPreventing a child process (HandbrakeCLI) from causing the parent script to exit
 

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    <p>I have a batch conversion script to turn .mkvs of various dimensions into ipod/iphone sized .mp4s, cropping/scaling to suit. Determining the original dimensions, required crop, output file is all working fine. However, on successful completion of the first conversion, HandbrakeCLI causes the parent script to exit. Why would this be? And how can I stop it?</p> <p>The code, as it currently stands:</p> <pre><code>#!/bin/bash find . -name "*.mkv" | while read FILE do # What would the output file be? DST=../Touch/$(dirname "$FILE") MKV=$(basename "$FILE") MP4=${MKV%%.mkv}.mp4 # If it already exists, don't overwrite it if [ -e "$DST/$MP4" ] then echo "NOT overwriting $DST/$MP4" else # Stuff to determine dimensions/cropping removed for brevity HandbrakeCLI --preset "iPhone &amp; iPod Touch" --vb 900 --crop $crop -i "$FILE" -o "$DST/$MP4" &gt; /dev/null 2&gt;&amp;1 if [ $? != 0 ] then echo "$FILE had problems" &gt;&gt; errors.log fi fi done </code></pre> <p>I have additionally tried it with a trap, but that didn't change the behaviour (although the last trap did fire)</p> <pre><code>trap "echo Handbrake SIGINT-d" SIGINT trap "echo Handbrake SIGTERM-d" SIGTERM trap "echo Handbrake EXIT-d" EXIT trap "echo Handbrake 0-d" 0 </code></pre> <p>Edited to add:</p> <p>The fact that the '0' trap fired prompted me to investigate why that might be. Executing as <code>bash -x $script</code> revealed that the <code>find | while read</code> loop is ending prematurely.</p> <p>I've re-factored the find and encode into separate scripts. The find loop is now:</p> <pre><code>find . -name "*.mkv" | while read FILE do handbrake-touch "$FILE" if [ $? != 0 ] then echo "$FILE had problems" &gt;&gt; errors.log fi done </code></pre> <p>The behaviour remains the same - one encode followed by the while loop ending. If I just put an 'echo $FILE' in place of the 'handbrake-touch', all the files are listed. The current directory doesn't change (I was wondering what might break the <code>find | while</code>).</p>
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    1. COAdd `-x` at the end of the shebang line to turn on tracing and see where exactly the exit is happening.
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      1. USDennis Williamson
 

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