[PHP] error/blob.c/OpenBlob/2641

[embers]

Hello,

I have been Googling

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error/blob.c/OpenBlob/2641

for the past two days trying to figure this issue out, but to little effect.

I am using Imagemagick within PHP, with the following code:

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$imagick = new Imagick();
$imagick->readImage("/path/to/file.mp4[60]");
$imagick->setImageFormat('jpg');
$imagick->scaleImage(400,0);
$imagick = $imagick->flattenImages();
$save = $imagick->writeImage("/save/here/image.jpg");

When I was running this on a Server with PHP 5.6, this worked no problem. PDFs (with [0] instead of [60]), MP4s, M4Vs, AVIs, JPGs and PNGs worked with the code above. No problem.

But after I moved my code from a dev server to the live server (this is what I get for having environments that are out of sync!), I started getting this error:

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unable to open image '/tmp/magick-1FmHq1zi.pam': No such file or directory @ error/blob.c/OpenBlob/2641

Further debugging reveals that "readImage" is the problem. If that function is passed a path to a video file, it will error out.

The first thing I thought was "permissions" - but the permissions for /tmp are 777.

Everything I have read concerning this error has to do with permissions, or the "convert" command - but as this is run through PHP, I am not sure what exactly goes on between PHP and Imagemagick.

Here are current versions for both.

[snibgo]

You are reading one frame of a video file. IM delegates that to ffmpeg. Is ffmpeg on the system path of your live server? And how about your dev server?

If that's the problem and you can't muck about with system paths, then putting the full path to ffmpeg in delegates.xml might fix the problem.

[embers]

You are reading one frame of a video file. IM delegates that to ffmpeg. Is ffmpeg on the system path of your live server? And how about your dev server?

If that's the problem and you can't muck about with system paths, then putting the full path to ffmpeg in delegates.xml might fix the problem.

Wellllllll dang. I installed FFMpeg and that worked like a charm!

I didn't see FFMpeg as a dependency for Imagemagick anywhere! I also know for certain it wasn't on the system that was running PHP 5.6 - so is this something that changed in the past year?

Anyways, thank you from the bottom of my heart!

[snibgo]

Pleasure.

Maybe your other system used a different program as delegate to extract frames from videos.

ffmpeg isn't strictly a dependency. If it isn't there and ImageMagick wants to use it, IM issues a "delegate failed" message. But this can get lost in the IMagick and PHP stack.

[embers]

Maybe your other system used a different program as delegate to extract frames from videos.

I'm guessing that was the case - is there a way to find that out? In the future this is probably something I need to know!

[snibgo]

"-verbose" generally tells you about delegate action, for example (at the command line):

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convert -verbose PolyA.avi[0] x.png

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"ffmpeg.exe" -nostdin -v -1 -i "C:/Users/Alan/AppData/Local/Temp/magick-2472P75JZ0dTfwXs" -vframes 1 -vcodec pam -an -f rawvideo -y "C:/Users/Alan/AppData/Local/Temp/magick-2472KeSEOnUq0QGJ.pam"

C:/Users/Alan/AppData/Local/Temp/magick-2472KeSEOnUq0QGJ.pam PAM 200x150 200x150+0+0 8-bit TrueColor sRGB 90.1KB 0.000u 0:00.000

PolyA.avi[0]=>C:/Users/Alan/AppData/Local/Temp/magick-2472KeSEOnUq0QGJ.pam PAM 200x150 200x150+0+0 8-bit TrueColor sRGB 90.1KB 0.000u 0:00.000

PolyA.avi[0]=>x.png PAM 200x150 200x150+0+0 8-bit sRGB 25.9KB 0.016u 0:00.015

Delegates are controlled by a text file, delegates.xml, in the same directory as "convert" etc.

[embers]

Thanks again! That all helped a lot.