Comments on: Seamlessly looping video in Flash

By: Sakana

Sakana — Wed, 29 Apr 2009 09:53:21 +0000

Hi Seb,

How are you ?

Hey did you noticed that in CS 4 the loop issue is corrected. If you import an FLV on your timeline and just compile you will never see the cut.

Regards,

By: Sakana

Sakana — Thu, 06 Nov 2008 12:40:28 +0000

No
Indeed, if I watch carefully I can see the little pause between last frame and first frame.

Regards,

By: Seb Lee-Delisle

Seb Lee-Delisle — Thu, 06 Nov 2008 11:41:05 +0000

That’s really useful information, thank you! Does the flv loop seamlessly with this method?

cheers

Seb

By: Sakana

Sakana — Thu, 06 Nov 2008 11:37:09 +0000

After some tests…

With an FLV of 6 sec 181 frames 640×480 pixels. After recording each frame with bitmapData I notice 217mb in memory usage. But the png sequence took 246mb in memory after loading the swf.

Another alternative, when I compress my mov file to FLV, I check the option, “key frame placement” and I put a key frame on each frame of the movie. The result : the size of the flv increase… from 600kb to 2mb. BUT when I load the flv I can navigate on the timeline like a png sequence with good performances and the size of memory usage is 16mb !

I think this last solution is the best match between performances/size.

Regards,

By: Sakana

Sakana — Wed, 05 Nov 2008 16:00:39 +0000

Okay, I will check that because if it’s “uncompressed” bitmap in memory it will be more.

By: Seb Lee-Delisle

Seb Lee-Delisle — Wed, 05 Nov 2008 15:52:52 +0000

That is true, but in theory that’s the same amount of memory that a PNG sequence would use once it was loaded into memory…

By: Sakana

Sakana — Wed, 05 Nov 2008 15:51:10 +0000

Okay I see. But for example, if you have an FLV of 6 sec 640×480 it can become a huge size in the memory of the user computer non ? And maybe crash the player.

Thank you for your feedback,
Regards,

By: Seb Lee-Delisle

Seb Lee-Delisle — Wed, 05 Nov 2008 15:20:03 +0000

Hi Sakana,

yes, in fact we implemented this system in the end. Embed the FLV on the timeline, then the first time you play it you record each frame into a bitmapdata. Then you can subsequently play back one bitmapdata at a time. It’s a small filesize but with the speed of rendering of a png sequence!

Seb

By: Sakana

Sakana — Wed, 05 Nov 2008 15:09:07 +0000

Hi,

I’m going to develop a little flash to manage 360° video. It’s just an FLV with a photo product rotating.

I would like to have the possibility to slide in my video.

I did 2 tests:
1/ FLV imported in a SWF, it’s okay, the file size is really smaller BUT the performances are really bad. 53% CPU Usage just when I slide on the timeline.

2/ PNG Sequence. this time the animation is perfect. CPU Usage less than 10% when I slide on the timeline but the file size is 3 times bigger.

Any ideas to have the best of the two solutions… filesize and performances ?

Thank you for your advice.
Regards,

By: seb

seb — Sun, 13 Jan 2008 20:58:00 +0000

Hey Frank, yes true this technique isn’t right for EVERY application, but as my videos are all short and need to be preloaded, this should work just fine! I’ll let you know how i get along.

Seb