AacMachine for FAAC

[bobsc]

I just tried FAAC 1.18(July,10) transcoding AC-3 and the -I 2,6 option did not work (channels out of order), but the default -I 3,4 seemed to work with the exception of no LFE and a loud click at the end.(Very limited testing).
The sound was much worse compared to the previous version encoding reordered wav files.

By the way PsyTEL seems to sound good encoding reordered wav files.
I keep hearing that PsyTEL has a multichannel bug, but now I am wondering if the whole problem here was improper channel order input.
If that's the case I would be happy if AacMachine would be able to input the proper channel order wav into PsyTEL.

My main objective here is to have a one step operation to transcode AC-3 to AAC and have the proper channel order.

[hans-jürgen]

Originally posted by bobsc
I just tried FAAC 1.18(July,10) transcoding AC-3 and the -I 2,6 option did not work (channels out of order), but the default -I 3,4 seemed to work with the exception of no LFE and a loud click at the end.(Very limited testing).
The sound was much worse compared to the previous version encoding reordered wav files. I copied your bug report to the thread that the developer started some days ago at the Audiocoding.com forum, because he probably has no account here. So it would be better to add any reports there. Thanks for testing!

http://www.audiocoding.com/phorum/read.php?f=1&i=3317&t=3317

By the way PsyTEL seems to sound good encoding reordered wav files. I keep hearing that PsyTEL has a multichannel bug, but now I am wondering if the whole problem here was improper channel order input. Ivan Dimkovic stated at that forum that PsyTEL suffers from the same bug that had to be fixed in Nero AAC (all input channels are mapped to 1 and 2 within the M/S matrix), while the differing multichannel layouts of the different formats (AAC vs. WAV vs. AC-3) is another problem. But you will probably get a better answer from himself:

http://www.audiocoding.com/phorum/read.php?f=1&i=2836&t=2815#reply_2836

[bobsc]

I just tried FAAC 1.18(July,28) transcoding AC-3 with foobar2000 and it works like a dream. :D

[Dark-Cracker]

Faac only support .wav and .ac3 for input or also .dts, .pcm (lpcm of course), .mpa/.mp2 ?

[hans-jürgen]

FAAC alone only supports WAV or raw PCM input, but the method discussed in this thread combining it with foobar2000's CLI encoder enables FAAC to transcode from any format that foobar can read without a temporary WAV file in between. This is definitely the case for MP2, but I don't know if there are input plugins for the other formats already. You could always suggest to the developers at www.foobar2000.org to create them, maybe they will listen... ;)

@bobsc: Thanks, at last... :) What quality setting did you use, the default -q 100? How did you like the sound, and what was the average bitrate for a 6-channel AAC transcoded from AC-3?

[bobsc]

@bobsc: Thanks, at last... :) What quality setting did you use, the default -q 100? How did you like the sound, and what was the average bitrate for a 6-channel AAC transcoded from AC-3?

I did use -q 100 and it sounds good. The average bitrate was 299kbps.

[hans-jürgen]

And this was with a short test file like the one you sent me or with a whole movie? You could also try a lower quality setting then like -q 90 -c 14000 which should result in ~100 kbps/stereo instead of the ~128 kbps/stereo with the default setting (-q 100 -c 16000).

[KpeX]

Holy thread resurrection batman :D

DSPguru:

I understand that your free time is limited as of late; however, due to FAAC's significant quality improvements (http://www.rjamorim.com/test/aac128v2/results.html) in recent versions, is there any chance for native FAAC support in BeSweet anytime in the near future ( so that we can take advantage of full floating-point conversions, azid to decode, and all the other advantages of BeSweet when transcoding AC3>AAC ) ?

Cheers,

[bobsc]

Originally posted by KpeX
DSPguru:

I understand that your free time is limited as of late; however, due to FAAC's significant quality improvements (http://www.rjamorim.com/test/aac128v2/results.html) in recent versions, is there any chance for native FAAC support in BeSweet anytime in the near future ( so that we can take advantage of full floating-point conversions, azid to decode, and all the other advantages of BeSweet when transcoding AC3>AAC ) ?
I would like to see FAAC support also. ;)