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POCannot create thumbnail in ImageMagick: "convert: no decode delegate for this image format"
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  1. POCannot create thumbnail in ImageMagick: "convert: no decode delegate for this image format"
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    copied!<p>I've been at this all day. I'm trying to upload images to a Mediawiki and this is the error I get when ImageMagick tries to create the thumbnail:</p> <pre><code>Error creating thumbnail: convert: no decode delegate for this image format `/tmp/magick-11924QG1rRXzT948I' @ error/constitute.c/ReadImage/552. convert: no images defined `/tmp/s3thumb-cripEh' @ error/convert.c/ConvertImageCommand/3127. </code></pre> <p>I setup a debug file for mediawiki and this is what I get in the log:</p> <pre><code>BitmapHandler::doTransform: creating 112x120 thumbnail at /tmp/s3thumb-cripEh using scaler im BitmapHandler::doTransform: called wfMkdirParents(/tmp) BitmapHandler::getMagickVersion: Running convert -version wfShellExec: /bin/bash '/var/www/mediawiki-1.21.2/includes/limit.sh' ''\''/usr/local/bin/convert'\'' -version' 'MW_CPU_LIMIT=180; MW_CGROUP='\'''\''; MW_MEM_LIMIT=202400; MW_FILE_SIZE_LIMIT=102400; MW_WALL_CLOCK_LIMIT=180' BitmapHandler::transformImageMagick: running ImageMagick: '/usr/local/bin/convert' -quality 80 -background white -define jpeg:size=112x120 '' -thumbnail '112x120!' -depth 8 -sharpen '0x0.4' -rotate -0 '/tmp/s3thumb-cripEh' 2&gt;&amp;1 wfShellExec: /bin/bash '/var/www/mediawiki-1.21.2/includes/limit.sh' 'OMP_NUM_THREADS='\''1'\'' '\''/usr/local/bin/convert'\'' -quality 80 -background white -define jpeg:size=112x120 '\'''\'' -thumbnail '\''112x120!'\'' -depth 8 -sharpen '\''0x0.4'\'' -rotate -0 '\''/tmp/s3thumb-cripEh'\'' 2&gt;&amp;1' 'MW_CPU_LIMIT=180; MW_CGROUP='\'''\''; MW_MEM_LIMIT=202400; MW_FILE_SIZE_LIMIT=102400; MW_WALL_CLOCK_LIMIT=180' [thumbnail] thumbnail failed on ip-10-168-26-167: error 1 "convert: no decode delegate for this image format `/tmp/magick-11924QG1rRXzT948I' @ error/constitute.c/ReadImage/552. convert: no images defined `/tmp/s3thumb-cripEh' @ error/convert.c/ConvertImageCommand/3127." from "'/usr/local/bin/convert' -quality 80 -background white -define jpeg:size=112x120 '' -thumbnail '112x120!' -depth 8 -sharpen '0x0.4' -rotate -0 '/tmp/s3thumb-cripEh' 2&gt;&amp;1" LocalS3File::transform thumb: LocalS3File::transform thumbTempPath: /tmp/s3thumb-cripEh, dest: wiki-images/thumb/1/19/5ovrDaU.jpg/112px-5ovrDaU.jpg info:1 LocalS3File::transform return thumb: MediaTransformError Object ( [htmlMsg] =&gt; Error creating thumbnail: convert: no decode delegate for this image format `/tmp/magick-11924QG1rRXzT948I' @ error/constitute.c/ReadImage/552.&lt;br /&gt; convert: no images defined `/tmp/s3thumb-cripEh' @ error/convert.c/ConvertImageCommand/3127.&lt;br /&gt; [textMsg] =&gt; Error creating thumbnail: convert: no decode delegate for this image format `/tmp/magick-11924QG1rRXzT948I' @ error/constitute.c/ReadImage/552.&lt;br /&gt; convert: no images defined `/tmp/s3thumb-cripEh' @ error/convert.c/ConvertImageCommand/3127.&lt;br /&gt; [width] =&gt; 112 [height] =&gt; 120 [url] =&gt; [path] =&gt; [file] =&gt; [page] =&gt; [responsiveUrls] =&gt; Array ( ) [storagePath:protected] =&gt; ) </code></pre> <p>Tried from the command line, copy pasted the command from the log (but used a test file):</p> <p><code>convert -quality 80 -background white -define jpeg:size=112x120 '' -thumbnail '112x120!' -depth 8 -sharpen '0x0.4' -rotate -0 'logo.jpg</code>'</p> <p>but the process hangs. If I run: </p> <pre><code>sudo convert logo.png -quality 80 -background white -define jpeg:size=112x120 -thumbnail '112x120!' -depth 8 -sharpen '0x0.4' -rotate -0 logo.jpg </code></pre> <p>It works. </p> <p>If I check DELEGATES, I have:</p> <pre><code>DELEGATES jng jp2 jpeg png ps tiff xml zlib </code></pre> <p>I tried increasing the default memory on media wiki to</p> <pre><code>$wgMaxShellMemory = 202400; </code></pre> <p>I feel like I've tried anything. Any ideas?</p> <p><strong>EDIT:</strong> This is what I've discovered so far: </p> <p>I'm pretty sure the shell wasn't executing the ImageMagick command because of the escaped backslashes in :</p> <pre><code>wfShellExec: /bin/bash '/var/www/mediawiki-1.21.2/includes/limit.sh' ''\''/usr/local/bin/convert'\'' -version' 'MW_CPU_LIMIT=180; MW_CGROUP='\'''\''; MW_MEM_LIMIT=202400; MW_FILE_SIZE_LIMIT=102400; MW_WALL_CLOCK_LIMIT=180' </code></pre> <p>Those <code>''\''</code> are causing the command to not run, and hence the <code>"no decode"</code> error. It can't decode, because the file is not there. I've traced <code>wfShellEec</code> to <code>GlobalFunctions.php</code>. The wfShellExec function is at around line 2778 on my file.</p> <p>In the <code>if ( php_uname( 's' ) == 'Linux' )</code> block there is:</p> <pre><code>escapeshellarg( $cmd ) </code></pre> <p>I removed the <code>escapeshellarg()</code> function and just left the <code>$cmd</code> on its own.</p> <p>Tried uploading again, the error is gone, the files are created, but now the thumbnail files are 0 bytes.</p> <p>Any ideas?</p>
 

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