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Originally Posted by doomleox999
I still don't get the same result I get when encoding with ffmpeg (2ch sounds the same as original 6ch)
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I can't understand how 2 ch sound the same as 6 ch.
2 speakers can supply the same volume than 6 speakers?
Do you listen the 6 ch in a 6 speakers system?
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Is it OK to encode the mkv directly to aac or m4a or is better to extract the audio and encode that file?
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It is the same, some soft (eac3to, ffmpeg) can do the 4 task (extract, decode, downmix and recode) in 1 job.
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Because something weird happens when I extract the audio. If I open it, MPC-HC tells me its lenght is 1 h 22 min but Windows Explorer says 3 h 46 min.
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If you want know exactly the info about a AAC audio you need extract the aac and use a soft than read the full file like
LeeAudBi, you can't trust in MPC-HC, Windows Explorer or MediaInfo.
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But when I check the MeGUI log I think the program is ignoring the script, maybe because of the options I choose:
Another weird thing is that MeGUI takes like 50 min to encode the audio,
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It is not normal, please supply the MeGUI log.
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Originally Posted by mkver
But does anybody have a definitive answer why ffmpeg uses different coefficients for float and non-float?
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Good question, but we can force the coefficients using the filter -af "pan=stereo..."
Then you can select the coefficients with ffmpeg and with AviSinth, and obtain the same.
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Probably it is because one doesn't need to care about clipping that much if one uses float output.
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But at some point in the chain of conversion between digital to analog audio all values over 1.0 are clipped.
You need Normalize or accept distort audio, maybe only a few points and you don't care in this sample, but we can't expect that always.