What is going on with video?
Sep 10, 2012
By
R Rothrock
Our corporate network has a requirement that video files have a low data rate around 300 kbps. Our LMS folks also have a requirement that we keep the individual files in a package of learning to 15 MG or less.
So I'm doing some experimenting with different video encodings to see what will work best with SL.
I start off with two versions of the same video. They are both encoded as h.264 and save in mov format.
- Small: 15,032 KB, data rate of 372 kbps
- Bigger: 15,710 KB, data rate of 389 kpbs
Small has dimensions of 320 x 144 and bigger is 640 x 384 - I know those have different aspect ratios. I bring them both into SL and publish my project. They end up radically different.
- Small: 7,965 KB, 192 kbps
- Bigger: 17,218 KB, 423 kbps
So one got cut almost in half, the other grew by a fair amount. Any idea what is going on? Is there a way to
2 Replies
Hi R Rothrock,
Take a look at this Knowledge Base article. This one too. As far as compression goes and the different sizes that they bring, did you use the same compression for both videos?
Always Happy to Help,
Adrian
Yes. They were in the same story file. So they both had the same compression through storyline.
So it looks like I should encode them as FLV with alpha channel to get SL to leave them alone -- as long as I'm not going to be delivering them via html5. I'll give that a try. Of course I don't have any actual transparency in this video....
Do you know which codec FLV with alpha channel would be?
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