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Posted by Erwin Moller on 03/28/07 11:29
CptDondo wrote:
> Erwin Moller wrote:
>> CptDondo wrote:
>>
>>> I have an airlink101 ipcam. It "streams" jpeg images to a web browser.
>>>
>>> Basically, the camera sends a never-ending http page, and continually
>>> retransmits a jpeg image.
>>
>> Hi,
>>
>> Really? A never ending http page that refreshes the image all the time?
>> Do they use some meta-refresh header for that?
>>
>> They would be better off using JavaScript, and simply replace the image
>> all the time (better performance).
>>
>> But I think you can just look at the URL of the image, and my bet is that
>> that same image changes all the time. Right?
>>
>> If so: what you need in PHP to get the stream of images is simply
>> rerequesting the same image all the time and store them on HD or
>> something.
>>
>> So you need something simple as:
>>
>> *****************************
>> // Look up the path in the sourcecode of you page that displays the jpg
>> $imageSourcePath = "http://localhost/path/to/your/cam/image.jpg";
>> $saveDir = "/home/Yan/webcam/";
>> $nrOfPicsToCapture = 1000;
>>
>> for ($counter=0;$counter<$nrOfPicsToCapture;$counter++){
>> // make sure nobody caches
>> $theImg = $imageSourcePath."?rand="+microtime();
>> // get new picture
>> $content = file_get_contents($theImg);
>> // safe it in a file
>> $fileName = $saveDir."image".$counter.".jpg";
>> file_put_contents($fileName,$content);
>> }
>> *****************************
>> (not tested of course)
>>
>> How you make a movie out of the seperate jpg files, I don't know, but I
>> am sure some software out there can help you with that (try sourceforge
>> eg).
>>
>> Hope that helps.
>>
>> Regards,
>> Erwin Moller
>>
>
> That was my first cut.... But it takes about 1-2 seconds to refresh,
> and the camera frame rate is 10 fps. Here's the description of the
> process the camera uses (from
>
<http://msdn.microsoft.com/coding4fun/hardware/video/article.aspx?articleid=912407>
> ):
>
> MotionJPEG over HTTP uses the Content-Type header
> "multipart/x-mixed-replace" along with a configurable boundary. This
> means that the stream is made up of Multiple Parts (hence multipart) and
> each new frame should replace the previous frame (hence
> x-mixed-replace). This particular camera sends an HTTP Header like this:
>
> Content-Type: multipart/x-mixed-replace;boundary=--video boundary--
>
> So.. I'm kind of stuck on how to deal with that. I want to take that
> stream and display it an an embedded object.
Yes, I see.
Sorry, I have no clue how to proceed either. I never did that before. :-/
Maybe dig into RFC that describe this type of stream?
Good luck
Regards,
Erwin
>
> --Yan
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