Well, the title says what I'm doing. I need to make a decision about what the audio is going to be. I want full 5.1ch for the main track, and I have several 2ch tracks (extras and director's comments). I am debating about keeping the AC3 and using an mkv container and using AAC in an mp4 container or a mix of AC3 and AAC in an mkv container. The movie will be played back over a high quality surround sound system at high volume, so quality is very important.
On the main track I am considering keeping the original AC3 or using Nero LC AAC (Nero 6 dll) @ CBR 388 or CBR 448.
For director's comment and stereo tracks I am considering the original AC3, aacPlus v2 Parametric Stereo @ 96 kbit or Nero LC AAC @ 128 kbit.
Well, what do y'all think? Is completely converting to AAC worth it so I can use the MP4 container?
Originally Posted by Oline 61On the main track I am considering keeping the original AC3 or using Nero LC AAC (Nero 6 dll) @ CBR 388 or CBR 448.
Using Nero LC AAC on that bitrate is good option. You can try to use FAAC it is my favor for LC encoding but your choice.Originally Posted by Oline 61For director's comment and stereo tracks I am considering the original AC3, aacPlus v2 Parametric Stereo @ 96 kbit or Nero LC AAC @ 128 kbit.
First Parametric Stereo can be used only @ lt;=48kbs. For this encoding is best to use aacPlus/HE-AAC @ 96-128 but only CT. Nero can't use HE-AAC @ 128. Good option will be aacPlus @ 112kbs but you choice
Keep the original ac3 if quality is important and you got enough space. Especially when the bitrates of aac and ac3 are almost the same (388 vs 448, as you say).
I wouldn't go for aac plus (it's for real low bitrates, like below 64kbps).
Originally Posted by SlograKeep the original ac3 if quality is important and you got enough space.
Have a space but loose mp4 container who is better if you want to watch you films on standalone players when they start supporting AVC video.Originally Posted by SlograI wouldn't go for aac plus (it's for real low bitrates, like below 64kbps).
LC is terrible @ lt;128kbs like a mp3. for you case 96-128kbs HE/aacPlus is good choice
Will there be very much audible loss between Nero LC-AAC 388 kbit and the original 448 kbit AC3?
What about between aacPlus v2 112 kbit and the original 192 kbit AC3?
Also, I heard that FAAC's quality was horrible. Is this true?
Originally Posted by Oline 61What about between aacPlus v2 112 kbit and the original 192 kbit AC3?
Well you must to test but can't be so horrible. I doing movies with aacPlus @ 112kbs 6ch and i am very happy with quality especialy commpared to Nero 6/7 at same bitrate ofcourse HE-AAC.Originally Posted by Oline 61Also, I heard that FAAC's quality was horrible. Is this true?
No. Were you hear that. You can aslo test this and which is better to you then use him.
My recommendation get away from nero especialy nero 7 for now. Maybe in nar future condition can change.
LC is terrible @ lt;128kbs like a mp3. for you case 96-128kbs HE/aacPlus is good choice
192 kbps AC3 is stereo, not 6ch....
iTunes 96 kbps stereo is better than any He-AAC stereo, for stereo source, only use He when it is 80 kbps or lower
Well, iTunes 96 kbps AAC can up to only 44 khz, not 48 khz
Also, I heard that FAAC's quality was horrible. Is this true?
Yes, it can't compete with Nero at lower bitrates, it is not developed anymore since 2004, if you bought nero, you use nero.......
director's comment are mainly speech, you might consider using He-aac 64 kbps? .... if you have enough space, of course avoid HE-aac
Heh, right now I'm thinking about keeping the AC3's. DRC is nice when I want to use headphones, but still crank it up on the home theater, and it just sounds better. The AAC seems to compress the Dynamic Range at higher volumes, I like being able to turn DRC off for my theater.
Originally Posted by Oline 61Heh, right now I'm thinking about keeping the AC3's
Heh that is you choice. For me best for stereo files LC is only good @ =gt;192 if you want keep good quality. But i recommend you to use aacPlus @ 96-128kbs and you choice what you use.Originally Posted by kotrtimWell, iTunes 96 kbps AAC can up to only 44 khz, not 48 khz
This 96kbs sounds me same as mp3 at same bitrate but bit better.
I think I've settled on 388 kbit/s LC AAC Nero for the surround tracks, and 128 kbit/s aacPlus v2 for the stereo tracks.
One question. Which channels setup should I use. I am obviously above PS, but should I use Dual Channels, Stereo Independent, Stereo, etc? What is the difference between these similar sounding formats?
EDIT: This project is going to have some weird combinations in it. The main movie will be straight mp4 with an avc track and two aac tracks. Then the extras will be in mkv with mpeg2 video and one aac track each. I wanted to maintain the interlacing and deinterlace with PureVideo on playback, so I'm transcoding them to mpeg2 with HC. Wierd stuff lol.
why wouldn't you just go for normal LC-AAC 128 kbps?
using HE-AAC at this bitrate is useless and will give negative impact, 100% guaranteed worse results than LC!
You are using High bitrate SBR of Winamp? the 96000 Hz...... no it's not better than just plain normal LC - AAC
Stereo - joint stereo in mp3...
Stereo Independent - L mono + R mono, bitrate of both channels can vary
Dual Channel - L mono + R mono, bitrate of left and right must be equal
Okay, in that case I will use Nero LC for all of the audio then.
About the channel's format, the Winamp encoder is CBR, no? Stereo Independent and Dual Channel should yield the same results then, shouldn't they?
Thanks for the help.
dual channel is use when .... you know, vcd, the left channel and right channel have different languange, you want to make sure both languages have the same bitrate....
but that's pretty useless since these days, you can create 2 mono 64 kbps track instead of dual channel 128 kbps nonsense, mp4, mpeg-2 can support multi audio track...so dual channel is kinda useless
stereo independent means L amp; R bitrate can vary, how would you know if left needs more or right needs more, but I think always use joint-stereo (winamp calls it stereo), only use stereo if you encounter any stereo problems
Nero 128 LC is good choice. For me Winamp aacPlus @ 128 for me sounds better but you choose. Why you don't encode with both encoders and compare.
I think the Nero LC AAC has a little edge at higher frequencies. It sounds better to me. I have decided that for the main 5.1ch track I will keep the AC3. It is essential to the success of this backup that that track sound great, and the transcoding from lossy to lossy causes too much degredation. |
Post at 2011-4-15 14:30
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