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I have a sequence of PNG-images with transparency which I want to convert to an FLV video with transparency.

So far I have been using ffmpeg to create FLVs (vp6a), but it doesn't seem to support alpha channels.

The only software I found so far is Adobe After Effects, but it is too pricey. And then there is Adobe Flash Media Encoder, but it can only encode live from devices and not from file.

So is there an open source alternative that can create FLVs with alpha channels?

slhck
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clamp
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4 Answers4

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In a browser, you can display an FLV with alpha channel with just changing some parameters.
See the following article for an example: Alpha Video and HTML: How did they do that?

If you are looking for software to do that, I don't know of any good open-source solution, but there is a low-budget commercial alternative : Moyea Flash Video MX Pro ($99.95), with a free trial for checking it out. You can watch a demo video tutorial here.

EDIT

The K-Lite Codec Pack is said in the Codec Guide to contain all the flavors of the VP6 codec : VP60, VP61, VP62, VP6A, VP6F.

harrymc
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AviDemux, open first Image via "File"->"Open", add following images via "File"->"Append...".

Choose "Sorenson Spark" in Video, "FLV" in Format. Configure your settings, play with filter, then Save as Video, and you're done!

Grumpy ol' Bear
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I found these:

  • FLV Converter

  • FFmpeg this is supposedly an open source software

  • on2 This supposedly has a cheap version that you can purchase.

I'm not too familiar with flv so i hope this can guide you in the right direction.

James Mertz
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VP6a encoding is pretty new and therefore only supported in commercial products like Adobe After Effects and Sorensen Squeeze.

Rafael Rivera
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