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For presentations or web-pages I often need to create moviesfrom IDL showing, e.g., the evolution of a solar feature with time. Thispageexplains how I do this.
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Choosing a movie format (mp4 and webm)
Themost common format is mp4 and this is generallyrecommended when you are making movies for presentations (Powerpoint,Keynote), but you have to be careful with the codec used. The bestcodec is 'h.264' but IDL can not create a movie with it due to licenserestrictions. The default IDL codec is fine for presentations, but notif you want to embed your movie in a web browser.
The webm format is promoted by Google and it has the advantageof being royalty-free, thus movies can be created from IDL directlywithout any problem. The main disadvantage is that Apple's Safaribrowser does not support the format, so your webm movies embedded in aweb page will not work.
I've created a webpage with the same movie created in webm andmp4 formats. You can use this to compare how embedded movies work withdifferent browsers.
QuickTime and iMovie (Mac)
Modern Macs come with QuickTime X pre-installed, but it doesn't allow images to be combined into a movie. QuickTime Player 7is an older version of QuickTime that Apple still distributes and iscompatible with old movie formats. It also does not allow images to becombined into a movie. However,it can be upgraded to QuickTime 7 Pro and this does allow you to makemovies. Unfortunately it seems it's no longer possible to buy the Proregistration keys (they're not listed on the Apple site). You couldcheck with your IT department or colleagues if they have an oldregistration key that you could use (note the keys don't expire).
UPDATE (2018): it seems Apple doesn't allow you to upgrade toPro even if you have a registration key. I think the only way to getPro working is to install Quicktime 7 by using the Time Machine backupfrom a machine that does have Pro (not confirmed yet).
Anotheroption is to try using the iMovie software that comes with modern Macs,but I haven't had any success in getting this to work.
My Quicktime method (for a Mac)
My method for creating a good movie is to write out individualimageframes from IDL using plotobjects. In particular note that any plot object, p, can be writtentoa png using:
IDL> p.save,'image.png',resolution=96
The resolution=96 ensures the output image has the same sizeas the image displayed on your screen.
After I've created a set of images (I usually call themimage0000.png, image0001.png, etc.), I then use QuickTime Pro (Mac) toread the images into a movie. I do the following steps:
- Click on File -> Export...
- Select 'Movie to MPEG-4' option, and click on the'Options...'button.
- Select File Format 'MP4', and Video Format 'H.264'.
- Data Rate should be set around 2000 kbits/sec.
- For 'Image Size' use 'Current'.
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Embedding the movie in html
To embed the movie in a webpage, you need to use the html5video container. I suggest going to one of my webpagesand viewing the page source for the video on this page to see how itworks.
The option 'controls' will display play and stop buttons whenthe movie is played, while 'loop' makes the movie automatically loop.
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