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5.1 to 2.0 and AC3 in Premiere

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I'm asking for two things: first, how can I convert a 5.1 ac3 to a 2.0?

And second, is there a plugin or something I can download in order to use ac3 sound in Adobe Premiere Pro 1.5?
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I don't understand, why you want to do a downmix, but here's one possible way of doing it :

1) Use BeSweet to split the 5.1 AC3 to 6 mono WAVs.
2) Open any audio editor. Merge the Front right and Surround right into one right chanel, and the front left and surround left into one left chanel.
3)Now add the 0.1 track to both left and right tracks
4) I'm not sure what to do with the centre (or center for amerricans) chanel, but probably you can copy it to both left and right chanels.
5) Use the right and left chanels to do a stereo Wav file
6) Encode the stereo WAV to stereo AC3

That's a THEORY, I'm not sure how would it sound. Also you can in step one use besweet to convert the 5.1 AC3 to a stereo WAV (or AC3) but the results are really poor.


About Premiere - I don't know
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Besweet can do the downmix automatically (there is no need to divide into 6 channels and merge them manually). The default downmix matrix is also Dolby Surround compatible, so when the 2.0 file is played back with pro-logic decoding you get a centre channel and a (mono) surround channel. The downmixed output is fine, what pittrek means when he talks about poor quality is the result when using BeSweet to encode to AC3. If you need the 2.0 encoding to AC3 you're better off using a commercial encoder if you have access to one, or the open-source encoder Aften. Alternatively you could encode to MP2.

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A - I need to downconvert because I'm editing 5.1 material in with 2.0 material, and I'd rather downconvert that little bit than upconvert the rest.

B - Is there some trick to the BeSweet idea? When I tried to do a 5.1 ac3-2.0 wav conversion that I ended up with just the front-left and front-right channels rom the 5.1 with no dialogue at all.
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What BeSweet switches did you use? Downmix options are set in the -azid() section; for a 2-channel output I thought the default was to do a Dolby Surround downmix.

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