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Apple ProRes to Flash: best workflow


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Apple ProRes to Flash: best workflow
by Alessio Gemma on Nov 26, 2007 at 12:20:56 pm

Hello,
I need to obtain a flash movie (flv file) from a clip exported directly from the timeline (using Media 100 or FCP).
The exported clip is a PAL 720x576 @25fps encoded with Apple ProRes 422 codec.
My target is a 480x384 FLV with a maximum bitrate of 1,2 Mbps.
I used Apple Compressor, using QuickTime Components (I think that Flash Exporter was added in QuickTime with the installation of Adobe Flash CS3 Encoder):
-1200 Kbps as maximum datarate

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Re: Apple ProRes to Flash: best workflow
by Danny2007 on Nov 27, 2007 at 4:46:41 pm

Where did you get 480x384? It's neither 4:3 or 16:9.
Why no deinterlace? Was it shot progressive?

If it wasn't shot progressive then you really should deinterlace.
480x384 will distort the picture - try 448x336 (ideal) or 480x360

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Re: Apple ProRes to Flash: best workflow
by Alessio Gemma on Nov 28, 2007 at 2:52:18 am

Thanks Danny for your reply.
Well, I start from a timeline, PAL CCIR 601 720x576 25fps 4:3 and I export in a self-contained movie with Apple ProRes 422 HQ codec.
Then I add the exported clip in the Flash 8 Encoder and I apply the settings I wrote in the first post.
Well, I used 480x384 because I need a width of 480px to perfectly fit a dedicated space in a web space: when I reduce from 720 to 480 (and the "mantain aspect ratio" box is checked) it automatically set the height to 384px....
I set a bitrate of 800Kbps and a keyframe every 12 frame (the clip has very fast changements).. but I obtain an awful clip!! Instead, doing the same with H.264 encoder, I obtain a very good clip.
This's the issue...
Regards,
Alessio

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Re: Apple ProRes to Flash: best workflow
by Danny2007 on Nov 28, 2007 at 7:48:33 am

Try the settings I first gave:

720x576 is non-square pixel material. Flash is always square pixel so if you need 480 wide Flash then the output should be 480x360 (480/1.33 = 360).

PAL is normally interlaced, so deinterlace for the output.

Try a less frequent keyframe setting - too many keyframes can hurt quality sometimes.

Make sure you are using the VP6 codec

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Re: Apple ProRes to Flash: best workflow
by Alessio Gemma on Dec 3, 2007 at 11:31:53 am

Ok, I tried your settings and.. wow! It works!
You were right, now the quality of the FLV clips it's very good.
Just one thing: I saw th "encode alpha channel" option in the Flash 8 compressor video settings.
I know that you use alpha channel in a video clip when the colour depth is 32bit.. so, when I have to check/uncheck it?
Anyway, I really thank you Danny.
Best regards,
Alessio

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Re: Apple ProRes to Flash: best workflow
by Danny2007 on Dec 3, 2007 at 11:45:23 am

Ok, I tried your settings and.. wow! It works!

Phew, at least my job is safe, for a while! ;-)

You do not need to encode the alpha channel, so uncheck the box.

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