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Old 14th February 2015, 15:53   #1  |  Link
Neroldy
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Some question about surround audio track and stereo audio track

I have some question about sorround audio track and stereo audio track these days, so I want to ask about it. And I'm sorry for my bad English.

1. For audio listening, I just use my laptop and JBL PEBBLES Stereo voice box, and does it make sense to use AC-3 5.1(640K) instead of AC-3 2.0(640K/448K/384K)? Does it will be better for stereo playback using sorround audio track?
2. I want to convert AC-3 5.1(640K) to AC-3 2.0 to just keep the stereo part of original audio file using eac3to, what bitrate should I decide? I don't want to increase bitrate unless it is useful for the audio file. I use eac3to like this command:
Code:
eac3to "original_audio(640K).ac3" "audio.ac3" -down2
and the bitrate of audio.ac3 is 448K, does this result tell me that in the sorround audio track(640K/5.1), the stereo part is 448K?

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Old 14th February 2015, 17:53   #2  |  Link
tebasuna51
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1) Nope. Use stereo.

2) For AC3 2.0 the eac3to default bitrate is 448 Kb/s, but is enough 256 Kb/s. Use:

eac3to "original_audio(640K).ac3" "audio.ac3" -downStereo -256
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Old 14th February 2015, 18:29   #3  |  Link
Neroldy
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Quote:
Originally Posted by tebasuna51 View Post
1) Nope. Use stereo.

2) For AC3 2.0 the eac3to default bitrate is 448 Kb/s, but is enough 256 Kb/s. Use:

eac3to "original_audio(640K).ac3" "audio.ac3" -downStereo -256
Thank you~
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Old 20th February 2015, 06:12   #4  |  Link
kuchikirukia
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1. You're downmixing, not "extracting the stereo."

2. Why would you transcode to something as old as AC-3? Use QAAC --tvbr 91.

Last edited by kuchikirukia; 20th February 2015 at 06:28.
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