[swfmill] newbie: creating animation from a series of jpg files various timings
Nils Millahn
nils at hub124.co.uk
Mon Mar 5 14:25:14 EST 2007
I've just skimmed over this but it occurred to me that you could simply
set the framerate of the SWF to that of the frame-grabber, in which case
the millisecond values should correspond exactly to frames in the SWF.
That approach would remove any rounding issues you may have at the moment...
Jon Molesa wrote:
> I only skimmed this, but it may be useful to you. More so than my
> explaination
>
> http://www.science.uva.nl/ict/ossdocs/java/tutorial/ui/drawing/animLoop.html
>
> It talks about an animation loop. Appears to be java or js, but that's
> close enough to AS to gleen something useful maybe.
>
> * Seth Markowitz <seth.markowitz at gmail.com> wrote:
>
>
>> On 3/5/07, Jon Molesa <rjmolesa at consoltec.net> wrote:
>>
>>> Nice solution to a problem. Mind if I include this in the wip
>>> documentation as an example?
>>>
>>
>> what is the "wip" documentation? -- sure.. you can use the example in the
>> doc.
>>
>>
>> In either case, your issue isn't so much with swfmill as it is a
>>
>>> mathematical conversion from ms to fps. Is that a correct assessment?
>>>
>>
>> You're absolutely right. The real question here is what is a good formula
>> for converting milliseconds to frames. Right now I'm doing this in my perl
>> script:
>>
>> $fps = 15;
>> $frameNum = int($millisecondTimeStamp/1000 * $fps);
>>
>>
>>
>> My first thought is to decide on a fps rate that you'd like to have.
>>
>>> Then there _could_ be total of 1000 fps with the framegrabber. A fps of
>>> 12 fps is a good speed for the human eye I believe?? Double check on that.
>>> You'd have to figure out which block the captured frame fell into and
>>> place it
>>> in that frame. On a 12 second frame rate, 1 frame would contain
>>> 83.33ms. So you'd just have to figure out what which block the captured
>>> frame fell into. swfmill frame second1-frame1~=84ms,
>>> second1-frame2~=168ms... and so on.
>>> It's too early to come up with a formula, but maybe later, or maybe
>>> someone else can develop that. Anyway, I hope it helps and is close to
>>> correct. But that's the way I see it.
>>>
>>> * Seth Markowitz <seth.markowitz at gmail.com> wrote:
>>>
>>>
>>>> Hi,
>>>>
>>>> I'm a newbie to swfmill, but I did get it working for my purposes... I'm
>>>> just trying to figure out how to make it more efficient. Here is my
>>>> situation:
>>>>
>>>> Here's my inventory:
>>>> 1. I have 1000 jpg images taken from a vga frame grabber - NOT in frames
>>>>
>>> per
>>>
>>>> second... the timing is variable. For example, file1.jpg was grabbed at
>>>> 30ms, file2.jpg was grabbed at 400ms, file3.jpg at 410ms, an so on. The
>>>>
>>> time
>>>
>>>> starts from Time == 0ms when the frame grabber was turned on.
>>>>
>>>> 2. I have an XML file called capture.xml that contains the timestamp in
>>>> milliseconds for when each jpg was captured:
>>>>
>>>> <Capture>
>>>> <FileName>Slide_0020.jpg</FileName>
>>>> <SlideNumber>20</SlideNumber>
>>>> <CaptureTime>64174</CaptureTime>
>>>> </Capture>
>>>> <Capture>
>>>> <FileName>Slide_0021.jpg</FileName>
>>>> <SlideNumber>21</SlideNumber>
>>>> <CaptureTime>64869</CaptureTime>
>>>> </Capture>
>>>>
>>>> So....
>>>> By putting all the jpg files together into a SWF via swfmill, I should
>>>>
>>> have
>>>
>>>> a fairly descent "flipbook" type animation. I've created a perl script
>>>>
>>> to
>>>
>>>> parse the capture.xml file and creates a swfml file that looks like
>>>>
>>> this:
>>>
>>>> <?xml version="1.0" encoding="iso-8859-1" ?>
>>>> <movie width="640" height="480" framerate="15">
>>>> <background color="#ffffff"/>
>>>> <frame>
>>>> <!-- frame:0 ptime:54 -->
>>>> <library>
>>>> <clip id="image1" import="Slide_0001_Full_resize.jpg" />
>>>> </library>
>>>> <place id="image1" name="myImage1" x="0" y="0" depth="1" />
>>>> </frame>
>>>> <frame/><frame/><frame/><frame/><frame/><frame/><frame>
>>>> <!-- frame:6 ptime:408 -->
>>>> <library>
>>>> <clip id="image2" import="Slide_0002_Full_resize.jpg" />
>>>> </library>
>>>> <place id="image2" name="myImage2" x="0" y="0" depth="2" />
>>>> </frame>
>>>> <frame/><frame/><frame/><frame/><frame/><frame>
>>>> <!-- frame:11 ptime:752 -->
>>>> <library>
>>>> <clip id="image3" import="Slide_0003_Full_resize.jpg" />
>>>> </library>
>>>> <place id="image3" name="myImage3" x="0" y="0" depth="3" />
>>>> </frame>
>>>>
>>>> .....
>>>>
>>>> Right now this is klunky because I'm trying to convert the millisecond
>>>> timestamp into frames per second. For example, if I want to run this
>>>> animation at 10fps, I know that the jpg captured at 100ms will appear in
>>>> frame 1 and so on (is that right??). So what happens in between each
>>>> frame... if file1.jpg is captures at 10seconds before file2.jpg, I just
>>>> stick (10x10) 100 <frame /> tags as filler in between the two
>>>>
>>> images. There
>>>
>>>> must be a better way than this. Also, since I'm converting from
>>>> milliseconds to frames per second... I think I'm losing a lot of
>>>>
>>> precision.
>>>
>>>> How could I create this "flipbook" effect, given the inventory above
>>>>
>>> using
>>>
>>>> swfmill simple?
>>>>
>>>> I think this is a pretty interesting problem and I really wanted to
>>>>
>>> thank
>>>
>>>> the creators of swfmill... it's a great solution to this type of
>>>>
>>> thing. I
>>>
>>>> was orginally trying to create an AVI file from this series of jpg
>>>>
>>> files,
>>>
>>>> but it got way too complicated for me.
>>>>
>>>> Looking forward to some suggestions!!
>>>>
>>>> Seth
>>>>
>>>> _______________________________________________
>>>> swfmill mailing list
>>>> swfmill at osflash.org
>>>> http://osflash.org/mailman/listinfo/swfmill_osflash.org
>>>>
>>> --
>>> Jon Molesa
>>> rjmolesa at consoltec.net
>>>
>>> _______________________________________________
>>> swfmill mailing list
>>> swfmill at osflash.org
>>> http://osflash.org/mailman/listinfo/swfmill_osflash.org
>>>
>>>
>
>
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>
>
>
--
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Nils Millahn
Internet Solutions - Design and Development - Flash Specialist
T: +44 (0) 7909 528 617
E: nils at hub124.co.uk
W: www.hub124.co.uk
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