Corrupt AAC? want to convert to AC3!

[Undead Sega]

I dont know fi this is the right place to post this but i have an AAC that i demuxed from a trailer and it contains sweet DD5.1, but when i got the stream and tried to convert it to AC3 for conventional uses, i get error messages all the time.

i tried BeHappy and MeGUI and both cannot give me the encode i am wanting, thus i am assuming that the AAC itself is somewhat corrupted? i was wondering if anyone can help me out here on this.

http://www.mediafire.com/?sharekey=571f24e3ec9071e80dec85adfe0a530ae04e75f6e8ebb871

i bet u can guess which film this is :D

[Guest]

[bump after forum move]

[aerodown]

hi, i always have this problem last time when the audio is .aac (like your source) and what i do is mux the audio in mp4 container before encoding to ac3. you can try using mp4box or yamb a gui for mp4box

eg: mp4box.exe -add audioname.aac -new audioname.mp4

Kurtnoise mp4box (http://kurtnoise.free.fr/index.php?dir=mp4tools/&file=MP4Box-0.4.6-dev_20090715.zip)
Yamb (http://forum.doom9.org/showthread.php?t=115459)

hope this help.

[tebasuna51]

I can't see any problem in your sample.
Transcoded to ac3 with BeHappy/MeGUI (BassAudio and DirectShow methods), with Foobar2000, with eac3to (Nero Audio Decoder 2) and decoded to wav with Faad decoder.

All ok. Do you have any DirectShow filter to decode aac?
Try with ffdshow installed.

[Undead Sega]

okay then, but may i ask, when u did get to transcode to an AC3, did all the 6 channels remain? because i followed the method on making into a MP4 container, and transocoded from that.

when it was in the MP4 container, all the channels remain, but when i used MeGUI and even have the settings config to keep all original channels and so on, the resulting AC3 only has 2 and was in Stereo.

[aerodown]

okay then, but may i ask, when u did get to transcode to an AC3, did all the 6 channels remain? because i followed the method on making into a MP4 container, and transocoded from that.

when it was in the MP4 container, all the channels remain, but when i used MeGUI and even have the settings config to keep all original channels and so on, the resulting AC3 only has 2 and was in Stereo.

yes all the 6 channel remain, i try with megui aften:

General
Complete name : E:\TestVideo\the_dark_knight-tlr3_1080p_track2_aften.ac3
Format : AC-3
Format/Info : Audio Coding 3
File size : 6.83 MiB
Duration : 2mn 29s
Overall bit rate : 384 Kbps

Audio
Format : AC-3
Format/Info : Audio Coding 3
Duration : 2mn 29s
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Surround: L R, LFE
Sampling rate : 48.0 KHz
Stream size : 6.83 MiB (100%)



did you have ffdshow install? i have ffdshow and i try set the ffdshow mixer to stereo and when encoding with megui aften i got 2 channel only but if i disable ffdshow mixer i got all channel remain. if you have ffdshow and set mixer to stereo or else maybe you can temporary disable the mixer and look how its going, if you dont have ffdshow and get 2 channel stereo i have no idea and i hope some guru here can help you.

[Undead Sega]

excellent, thats great, but now may i ask, is there a way to change the rate, from 23.976 to 24 in MeGUI? because it has 23.976 to 25 and another but none that i can custom :(

[tebasuna51]

Use BeHappy or eac3to instead.

[Undead Sega]

for awhile now, i cannot use BeHappy even now, none of the processing even works and i just get error messages all the time.

but i really like it because i am able to choose wheather i want to keep the pitch change or not, tempo and rate, which is something i cannot do in MeGUI. any way to do it in there or is this a feature request that would hve to be added? :D

[tebasuna51]

...
but i really like it because i am able to choose wheather i want to keep the pitch change or not, tempo and rate, which is something i cannot do in MeGUI. any way to do it in there or is this a feature request that would hve to be added? :D
You always can copy this file.avs and open in MeGUI 'Audio Input'
# [Source: BassAudio]
#####################
bassAudioSource("D:\Internet\the_dark_knight-tlr3_1080p_track2.aac")

# [DSP: TimeStretch - 23,976 -> 24]
###################################
TimeStretch(last, tempo=100.1001)
You need, in your AviSynth plugins folder, BassAudio.dll (with BeHappy) and Bass.dll + Bass_aac.dll ( http://www.un4seen.com/ )