Author Topic: ExifTool PHP Fast Processing Script using StayOpen and Gearman  (Read 53441 times)

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #15 on: January 11, 2014, 08:51:36 PM »
-q effects only one command, so its effects are reversed after the next -execute.  There is no way to un-do it in the same command in which it was used, if that is what you are asking.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

TSM

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #16 on: January 13, 2014, 05:02:34 PM »
-q effects only one command, so its effects are reversed after the next -execute.  There is no way to un-do it in the same command in which it was used, if that is what you are asking.

- Phil

is the same to be said of the -echo3 command, is that per run or for the lifetime of stay_alive?
If -echo3 replaces -execute in your example then it causes a problem with my script as -execute allowed for a sequence number to be appended but your example seems to imply that -echo3 does -execute anyway.

I have tried to make it work but it does not, when using -echo3 i only get the warnings to stdout not the data, ive tried echo4 as well.
Are the order of the commands when using -echo very important?
« Last Edit: January 13, 2014, 05:22:47 PM by TSM »

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #17 on: January 13, 2014, 07:45:16 PM »
I think you are confused.  I didn't mean to imply that -echo take the place of -execute.  I just meant to say that if you add -q, then you must add an echo if you want to still receive the "{ready}" message.  You can echo whatever you want, so you could add a sequence number if you want too.  In all cases, -execute is still required.  Read the description of the -echo command in the application documentation.  It gives all of the details about what this option does.  There is no black magic.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

TSM

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #18 on: January 14, 2014, 02:20:54 PM »
Right I was going around in circles until i checked the code.

This has only become available since Jan. 27, 2013 - Version 9.15, hmm im still on 9.02

Time for an upgrade me thinks.

Also to help others, syntax should be as follows, remember each arg needs to be on its own line.
Code: [Select]
-q
-echo3
{ready}
testfile.jpg
-execute

Now I can update the PHP script to allow for this.

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #19 on: January 14, 2014, 02:29:46 PM »
Ah.  I forgot to check to see if you were using a recent version.  Glad you caught this.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

TSM

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #20 on: May 21, 2014, 12:29:18 PM »
Another thing, when posting multiline data such as IPTC:Caption-Abstract, normally we are using \n to split the line as we are linux based but this causes an issue to the stay_open as it uses \n to split commands, what do you do in this instance?

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #21 on: May 21, 2014, 12:36:35 PM »
There are various work-arounds.  See FAQ 21 for details.  The first technique won't work for argfiles, but the others will.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

TSM

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #22 on: May 21, 2014, 01:06:34 PM »
Hmmm interesting.

Would seem the best is to accept entities then 
 in my case (option b) as im feeding in the tags directly for each image i process.
May be an idea for me to add this directly into my API so others do not come across the problem, make it a toggle to switch it on/off and handle the conversion itself.

Also, normally when I was writing tags on the CLI I would wrap the data of each tag in quotes, it seems if this is done with stay_open it renders these quotes, would I be correct in saying the quotes on the CLI are interpreted by the shell before passing the args to exiftool but when using stay_open it is already within the app it does not and so it considers everything after the '=' to be the data to the '\n' character for that tag?

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #23 on: May 21, 2014, 01:16:29 PM »
would I be correct in saying the quotes on the CLI are interpreted by the shell before passing the args to exiftool but when using stay_open it is already within the app it does not and so it considers everything after the '=' to be the data to the '\n' character for that tag?

Correct.

  -@ ARGFILE
            Read command-line arguments from the specified file.  The file
            contains one argument per line (NOT one option per line -- some
            options require additional arguments, and all arguments must be
            placed on separate lines).  Blank lines and lines beginning with
            "#" and are ignored.  Normal shell processing of arguments is not
            performed, which among other things means that arguments should
            not be quoted and spaces are treated as any other character
.


- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

TSM

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #24 on: May 21, 2014, 01:41:34 PM »
I hope final one for today.

When using stay_open for writing to a file, I never seem to get any return data to say its done or if there was an error, ive forced errors such as file not existing etc but still nothing.
The only core params that are being set before writing args are ...
-g
-j
-coordFormat
%.6f
-E

Is this normal behaviour?

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #25 on: May 21, 2014, 09:07:59 PM »
Typically the errors go to stderr.  Are you reading this exiftool output?

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

TSM

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #26 on: May 22, 2014, 05:27:39 AM »
I am but only to a log file, ile have a look at parsing the data but there are a fair few things to check.
It would be nice if possible to have a basic output to the STDOUT when writing files that can be parsed easily with a more verbose log to the STDERR.
Also the error log does not contain any output such as {ready}, the only way I was going to work with it is read all the data into a variable then parse it after the STDOUT has returned {ready}, on the next cycle reset the buffer and start again.

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #27 on: May 22, 2014, 07:11:03 AM »
You can add "{ready}" to the stderr output with -echo4.

See cpp_exiftool for an example of how to do this in C++.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

TSM

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #28 on: May 22, 2014, 11:05:52 AM »
Thank you, that was helpful and ive taken a few functions from the C++ implementation into the PHP one.

Ive updated the API to implement getError/getErrorStr/getSummary

getError($id) - false if there is no error, the last error string
getErrorStr($id) - returns STDERR output regardless if there was an error
getSummary($msg) - returns value for summary message

Note that $id should only be supplied if you have passed a batch of different requests and executed fetchAll() as the return data will be an array of results, the index will be $id, if you leave as blank then it will only return if you had used fetch();

Phil Harvey

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Re: ExifTool PHP Fast Processing Script using StayOpen and Gearman
« Reply #29 on: May 22, 2014, 01:04:00 PM »
I just took a look at this code again.  By odd coincidence I'm using the -php output formatting for the C++ ExifTool communication.  But you're using -json format with PHP.  :P

I think the reason I did this was because the -json option didn't support binary output when I wrote the C++ ExifTool interface.  But the binary output in JSON is a bit of a kludge, so I don't regret this.  There may have also been a problem with JSON requiring well-formed UTF-8.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).