Image Manipulation ...

bsamson · April 21, 2008

Good Afternoon,

I found the following script which grabs a still image from an mjpeg video stream.

<?

// an IP address
$dest = "123.123.123.123";

if  ($_GET['view']=="1") {
    $view = ":1024"; 
    } elseif ($_GET['view']=="2") {
    $view = ":1025";
  }

$camurl="http://".$dest.$view."/img/video.mjpeg";

$boundary="\n--";

$f = fopen($camurl,"r");

if( ! $f ) {
//**** Failed opening the socket
if( function_exists( 'imagecreatetruecolor' ) && $img = imagecreatetruecolor( 320, 200 ) ) {
  // Display an image if we have GD
  $logo = imagecreatefromgif( "http://www.mydomain.com/backend/cams/img/errorConnecting.jpg" );
  $font = 1;

  header( "Content-type: image/jpeg" );

  imagealphablending( $img, 1 );
  imagealphablending( $logo, 1 );

  $img_w = imagesx( $img );
  $img_h = imagesy( $img );
  $logo_w = imagesx( $logo );
  $logo_h = imagesy( $logo );

  $bgc = imagecolorallocate( $img, 255, 255, 255 );
  $tc = imagecolorallocate( $img, 0, 0, 0 );
  $dc = imagecolorallocate( $img, 255, 0, 0 );

  imagefill( $img, 0, 0, $bgc );

  imagerectangle( $img, 0, 0, $img_w-1, $img_h-1, $dc );
  imageline( $img, 0, 0, $img_w-1, $img_h-1, $dc );
  imageline( $img, 0, $img_h-1, $img_w-1, 0, $dc );

  imagecopy( $img, $logo, 0, 0, 0, 0, $logo_w, $logo_h );
  imagestring( $img, $font, 5, $logo_h, "Error accessing $camurl", $tc );

  $date = time();
  $date = date( 'Ymd-His (O T)', $date );
  imagestring( $img, $font, 5, $logo_h + imagefontheight( $font ) + 1, $date, $tc );

  imagejpeg( $img );

  imagedestroy( $img );
  imagedestroy( $logo );
} else {
  // Display an error if we do not have GD
  header( "Content-type: text/html" );
  echo "<html><body><h1>Error</h1>Error accessing $camurl";
  echo "</body></html>";
}
} else {
//**** URL OK
// Transfer the image...
while (substr_count($r,"Content-Length") != 2) $r.=fread($f,512);

$start = strpos($r,'ÿ');
$end   = strpos($r,$boundary,$start)-1;
$frame = substr("$r",$start,$end - $start);

header("Content-type: image/jpeg");

echo $frame;
}

fclose($f);

?>

And this works well. However, we have 20+ cams and load time is of concern. What I am looking to do is to adjust this script to save the image NOT display it. Any assistance would be greatly appreciated! Thanks!

Zhadus · April 21, 2008

From that script it looks like $frame will be the final image. With that said, you should be able to output that variable to a file and that should accomplish what you are looking for.

jonsjava · April 21, 2008

<?

// an IP address
$dest = "123.123.123.123";
$save_directory = "/"; //change to the directory you want the files saved to
$filename = "image_".date("Y_m_d_Gi_s_u").".jpg";
if  ($_GET['view']=="1") {
    $view = ":1024"; 
    } elseif ($_GET['view']=="2") {
    $view = ":1025";
  }

$camurl="http://".$dest.$view."/img/video.mjpeg";

$boundary="\n--";

$f = fopen($camurl,"r");

if( ! $f ) {
//**** Failed opening the socket
if( function_exists( 'imagecreatetruecolor' ) && $img = imagecreatetruecolor( 320, 200 ) ) {
  // Display an image if we have GD
  $logo = imagecreatefromgif( "http://www.mydomain.com/backend/cams/img/errorConnecting.jpg" );
  $font = 1;

  header( "Content-type: image/jpeg" );

  imagealphablending( $img, 1 );
  imagealphablending( $logo, 1 );

  $img_w = imagesx( $img );
  $img_h = imagesy( $img );
  $logo_w = imagesx( $logo );
  $logo_h = imagesy( $logo );

  $bgc = imagecolorallocate( $img, 255, 255, 255 );
  $tc = imagecolorallocate( $img, 0, 0, 0 );
  $dc = imagecolorallocate( $img, 255, 0, 0 );

  imagefill( $img, 0, 0, $bgc );

  imagerectangle( $img, 0, 0, $img_w-1, $img_h-1, $dc );
  imageline( $img, 0, 0, $img_w-1, $img_h-1, $dc );
  imageline( $img, 0, $img_h-1, $img_w-1, 0, $dc );

  imagecopy( $img, $logo, 0, 0, 0, 0, $logo_w, $logo_h );
  imagestring( $img, $font, 5, $logo_h, "Error accessing $camurl", $tc );

  $date = time();
  $date = date( 'Ymd-His (O T)', $date );
  imagestring( $img, $font, 5, $logo_h + imagefontheight( $font ) + 1, $date, $tc );

  imagejpeg( $img );

  imagedestroy( $img );
  imagedestroy( $logo );
} else {
  // Display an error if we do not have GD
  header( "Content-type: text/html" );
  echo "<html><body><h1>Error</h1>Error accessing $camurl";
  echo "</body></html>";
}
} else {
//**** URL OK
// Transfer the image...
while (substr_count($r,"Content-Length") != 2) $r.=fread($f,512);

$start = strpos($r,'ÿ');
$end   = strpos($r,$boundary,$start)-1;
$frame = substr("$r",$start,$end - $start);

$new_file = fopen($save_directory.$file, "w+");
$write_file = fwrite($save_directory, $frame);
fclose($write_file);
/* header("Content-type: image/jpeg");

echo $frame;
*/
}

fclose($f);

?>

this should do it for you (I hope)

bsamson · April 21, 2008

Thanks for all the help! However, unfortunately the script doesn't want to save the image. Gives me errors indicating folder not found. Anyway, I also tried to use the IMAGEJPEG function ... but errors indicate that it doesn't recognize the format. Any one have any other suggestions as I am not yet too familiar with working with images in PHP. Thanks in advance!!!

-Brian

bsamson · April 21, 2008

Ok. Here's another approach ... (that isn't working) ...

<?php
$camurl="http://123.123.123.123:1024/img/video.mjpeg";

$boundary="\n--";

$f = fopen($camurl,"r") ;

   if(!$f)
   {
        //**** cannot open
        echo "error";
   }
    else
  {
        //**** URL OK
         while (substr_count($r,"Content-Length") != 2) $r.=fread($f,512);

         $start = strpos($r,'ÿ');
         $end   = strpos($r,$boundary,$start)-1;
         $frame = substr("$r",$start,$end - $start);

         header("Content-type: image/jpeg");
         imagejpeg($frame);
         
   }


fclose($f);

?>

This script displays this error:

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/grabStill-2.php on line 29

Any suggestions? Im sorry, but I have not worked much w/ PHP & images. Again, it's all I want to do is to save the frame that is captured. That side of the script works. Thanks in advance for any assistance!

Best Regards,

Brian

craygo · April 21, 2008

change this

         header("Content-type: image/jpeg");
         imagejpeg($frame);

to something like this

// no need for header info if your not outputting the image to the browser
$folder = "path/to/image/folder/";
$filename = "somename.jpg";
imagejpeg($frame, $folder.$filename);

Make sure the folder exists.

Here is the info for imagejpeg()

http://us2.php.net/manual/en/function.imagejpeg.php

Ray

bsamson · April 21, 2008

Appreciate the advice. However, I believe the problem is the fact that the image stored in $frame is not jpeg? That is just a shot in the dark because of this error:

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/grabStill-2.php on line 26

Any advise? Thanks in advance!

craygo · April 22, 2008

the image is above that.

<?php

// an IP address
$dest = "123.123.123.123";

if  ($_GET['view']=="1") {
    $view = ":1024"; 
    } elseif ($_GET['view']=="2") {
    $view = ":1025";
  }

$camurl="http://".$dest.$view."/img/video.mjpeg";

$boundary="\n--";

$f = fopen($camurl,"r");

if( ! $f ) {
//**** Failed opening the socket
if( function_exists( 'imagecreatetruecolor' ) && $img = imagecreatetruecolor( 320, 200 ) ) {
  // Display an image if we have GD
  $logo = imagecreatefromgif( "http://www.mydomain.com/backend/cams/img/errorConnecting.jpg" );
  $font = 1;

  header( "Content-type: image/jpeg" );

  imagealphablending( $img, 1 );
  imagealphablending( $logo, 1 );

  $img_w = imagesx( $img );
  $img_h = imagesy( $img );
  $logo_w = imagesx( $logo );
  $logo_h = imagesy( $logo );

  $bgc = imagecolorallocate( $img, 255, 255, 255 );
  $tc = imagecolorallocate( $img, 0, 0, 0 );
  $dc = imagecolorallocate( $img, 255, 0, 0 );

  imagefill( $img, 0, 0, $bgc );

  imagerectangle( $img, 0, 0, $img_w-1, $img_h-1, $dc );
  imageline( $img, 0, 0, $img_w-1, $img_h-1, $dc );
  imageline( $img, 0, $img_h-1, $img_w-1, 0, $dc );

  imagecopy( $img, $logo, 0, 0, 0, 0, $logo_w, $logo_h );
  imagestring( $img, $font, 5, $logo_h, "Error accessing $camurl", $tc );

  $date = time();
  $date = date( 'Ymd-His (O T)', $date );
  imagestring( $img, $font, 5, $logo_h + imagefontheight( $font ) + 1, $date, $tc );

  $folder = "path/to/image/folder/"; // Add this
  $filename = "somename.jpg";  // Add this
  imagejpeg( $img, $folder.$filename);  // Modify this

  imagedestroy( $img );
  imagedestroy( $logo );
} else {
  // Display an error if we do not have GD
  header( "Content-type: text/html" );
  echo "<html><body><h1>Error</h1>Error accessing $camurl";
  echo "</body></html>";
}
} else {
//**** URL OK
// Transfer the image...
while (substr_count($r,"Content-Length") != 2) $r.=fread($f,512);

$start = strpos($r,'ÿ');
$end   = strpos($r,$boundary,$start)-1;
$frame = substr("$r",$start,$end - $start);

header("Content-type: image/jpeg");

echo $frame;
}

fclose($f);

?>

bsamson · April 23, 2008

I am a bit lost ... what do you mean image is above that? Thanks in advance.

--Brian

craygo · April 23, 2008

You did imagejpeg($frame). $frame is not the image, the image is being created above that. I put notes next to the lines to change

  $folder = "path/to/image/folder/"; // Add this
  $filename = "somename.jpg";  // Add this
  imagejpeg( $img, $folder.$filename);  // Modify this

Ray

bsamson · April 25, 2008

Craygo,

Thanks for the help. However, that part of the script is only ran IF the URL (i.e.: http://11.11.11.11:1024/img/video.mjpeg) is not found. Here is the script w/ that section removed that I just tested and works:

<?php

$camurl="http://11.11.11.11:1024/img/video.mjpeg";

$boundary="\n--";

$f = fopen($camurl,"r");

//**** URL OK
// Transfer the image...
while (substr_count($r,"Content-Length") != 2) $r.=fread($f,512);

$start = strpos($r,'ÿ');
$end   = strpos($r,$boundary,$start)-1;
$frame = substr("$r",$start,$end - $start);

header("Content-type: image/jpeg");

echo $frame;

fclose($f);

?>

Thanks again for the help, any other suggestions?

Best,

Brian

craygo · April 25, 2008

so if I get this right $frame would be the image you are getting or just the name of the image?

bsamson · April 25, 2008

From what I understand $frame is the image. I have searched and searched for a solution. Thanks in advance for the assistance!

Best Regards,

Brian

craygo · April 25, 2008

Looking at the code, it looks like just the image name.

What do you get when you echo $frame.

Ray

bsamson · April 25, 2008

The image, without it nothing is displayed.

craygo · April 25, 2008

Can you right click on the page and get the page source and post the section for the image.

Ray

bsamson · April 25, 2008

I just copied the script to my personal domain. Here is the URL:

http://www.nnylocal.com/phpFreaks/grabStill-3.php. This is a working cam in one of our stores ...

Thanks!

Best Regards,

Brian Samson

craygo · April 25, 2008

Looks like you will have to do something like this.

<?php
$size = getimagesize($frame);
$img_src = imagecreatefromjpeg($frame);
$img_dst=imagecreatetruecolor($size[0],$size[1]);
imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $size[0], $size[1], $size[0], $size[1]);
  $folder = "path/to/image/folder/"; 
  $filename = "somename.jpg";  
  imagejpeg($img_dst, $folder.$filename);   
  imagedestroy($img_dst);
?>

Other than that you would have to make a different page with the code above it in it and use grabStill-3.php as the source file.

So if you hade to do that just add

$frame = "grabStill-3.php";

to the top of the above code

Ray

bsamson · April 25, 2008

Ok ... using this script:

<?php

$camurl="http://111.111.111.111:1024/img/video.mjpeg";

$boundary="\n--";

$f = fopen($camurl,"r");

//**** URL OK
// Transfer the image...
while (substr_count($r,"Content-Length") != 2) $r.=fread($f,512);

$start = strpos($r,'ÿ');
$end   = strpos($r,$boundary,$start)-1;
$frame = substr("$r",$start,$end - $start);

  $size = getimagesize($frame);
  $img_src = imagecreatefromjpeg($frame);
  $img_dst=imagecreatetruecolor($size[0],$size[1]);
  imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $size[0], $size[1], $size[0], $size[1]);
  $folder = "/home/nnyserve/www/backend/cams/scripts/stills/"; 
  $filename = "somename.jpg";  
  imagejpeg($img_dst, $folder.$filename);   
  imagedestroy($img_dst);

// header("Content-type: image/jpeg");
// echo $frame;

fclose($f);

?>

I received these errors:

Warning: getimagesize(ÿØÿÛ) [function.getimagesize]: failed to open stream: No such file or directory in /home/nnyserve/public_html/backend/cams/scripts/grabStill-4.php on line 17

Warning: imagecreatefromjpeg(ÿØÿÛ) [function.imagecreatefromjpeg]: failed to open stream: No such file or directory in /home/nnyserve/public_html/backend/cams/scripts/grabStill-4.php on line 18

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /home/nnyserve/public_html/backend/cams/scripts/grabStill-4.php on line 19

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/grabStill-4.php on line 20

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/grabStill-4.php on line 23

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/grabStill-4.php on line 24

LOL ... Thanks for all the help thus far Craygo ... but any other idea's?

Best regards,

Brian Samson

craygo · April 26, 2008

Well all it takes is the first one to error and the rest just follow. Did you try puting the code I did above in it's own file and call the script which creates the image

file called saveimages.php

<?php
  $frame = "grabStill-3.php"; 
  $size = getimagesize($frame);
  $img_src = imagecreatefromjpeg($frame);
  $img_dst=imagecreatetruecolor($size[0],$size[1]);
  imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $size[0], $size[1], $size[0], $size[1]);
  $folder = "/home/nnyserve/www/backend/cams/scripts/stills/"; 
  $filename = "somename.jpg";  
  imagejpeg($img_dst, $folder.$filename);   
  imagedestroy($img_dst);
?>

Now instead of browsing to grabStill-3 go to saveimages.php

Ray

bsamson · April 27, 2008

Ok ... Just tried your scripts ... and now this:

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error: in /home/nnyserve/public_html/backend/cams/scripts/imgTest.php on line 4

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: 'grabStill-3.php' is not a valid JPEG file in /home/nnyserve/public_html/backend/cams/scripts/imgTest.php on line 4

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /home/nnyserve/public_html/backend/cams/scripts/imgTest.php on line 5

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/imgTest.php on line 6

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/imgTest.php on line 9

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/nnyserve/public_html/backend/cams/scripts/imgTest.php on line 10

I just dont understand PHP & images ... lol ... thanks for all your help though! Any other suggestions?? Thanks!

Best Regards,

Brian

bsamson · April 29, 2008

Anyone have any other suggestions? Thanks in advance!

Best Regards,

Brian

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