Compressor - Dolby Digital 5.1 AC3 encoding problem

I'm completely stuck - I'm creating AC3 files in compressor using the "add surround sound feature" from 6 DISCREET mono AIFF files. I know they are discreet because I've listened to them in STP.
When I create the AC3 files, however, they playback (on a surround sound system that supports 5.1) in all speakers - I'm getting bleed from each track on all speakers - for example, I can hear spoken dialog in the rear speakers, though the discreet AIFF files for both rear speakers do not this spoken dialog in them.
I'm at a loss and under pressure to create true, 5.1 AC3 files today. I have no idea what I could be doing wrong. Any ideas? Does it matter that my Mac Pro sound card does not support 5.1 Playback (again, I'm listening to the files on a surround sound system, not on this computer)
Thanks for any help you may have!
Message was edited by: forty8

You may need Apple's MPEG2 QT plugin as well for MPEGStreamclip.
Also, consider if running windows in parallels/Boot Camp etc that there's a windows version, and possibly a linux version.
VisualHub code was released open source - Google FilRedux and PunyVid (iSquint derivative). Not tried either though.

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http://handbrake.fr/
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MPEG4 with H.264 video, Audio Tracks can choose Dolby Digital 5.1 (AC3) + Dolby ProLogic II, Audio Track 2 - whatever you want.
tried it last night work flawlessly and is about twice as fast encoding as before (not a carefull test but it was WAY faster)
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Hardware
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Nice.
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Audio to dolby digital surround AC3

Regards,
I have one test sequence in FCP,,, left channel is sound, and right is speech,, then exported separately to two mono channels,,, named SOUND and SPEECH,, I can hear each channel nice after that,,
But, when I make AC3 file with compressor, I have problem.
Can somebody tell me where I make mistake??
With compressor I make New Job With Surround sound group,, then select for every channel one mono channel, from FCP, specifically; L - speech, C-sound, R -speech, Ls -sound, Rs-sound ,,,
after select File format,, Dolby digital Professional,, Target sistem is DVD video,,,, Audio coding mode is 3/2,,, In Preprocessing, compression presset is NONE,, after submit this I have AC3 file, and when I make DVD and looking in my home dolby digital system I hear completely diferent disposition,, L - Sound, C-sound, R-speech (very quiet) Ls- sound, Rs-speech,
I was trying and different setup, but I cannot acquire adequate setup,, before I was using AC3 encoder (FCP 4.5), and everything was perfect,
Thanks,

Sry, your comment is 5 month old, but i have to ask you some thing too:
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AC3 encoding is impredictable in Compressor 2

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Is there a way to install A.pack on a system with DVD studio Pro 4 installed?

I've seen one unconfirmed report that A.Pack would not work under QuickTime 7. However, I have A.Pack installed on my Tiger system (which uses QT7) and it seems to be okay. I've not tried any long audio encodings and under Tiger I have not yet burned a DVD with Dobly/AC-3 audio but A.Pack does run under my Tiger/QuickTime 7 setup.
Given that, I would expect that the files output from A.Pack would still work with DVDSP 4. However, I can't confirm that since I'm still using DVDSP 2.
In Compressor 2.02 ...
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FCPX, Compressor and Dolby Digital 5.1

Hi all,
I had Final Cut Pro 7 HD and gone over to FCPX.
The Apple Store in Sydney told me to burn a disc with 5.1 surround sound I should export to Compressor. Tried but no sound. is it possible to burn to disc with 5.1 from FCPX?
I've been using FCP for around 10 years but FCPX is a bit of a learning curve. Even with FCP 7 never needed to use compressor as the movies I make are mainly for friends and family but now I have to have a 5.1 Dolby Digital soundtrack. I understand DVD Studio Pro did that but it's very complicated so please, even though well versed in the old FCP, treat me as a newbie on the new version.
Basically I have footage captured with my new Sony HDR- CX190 and have imported into FCPX. I have some audio I want to dub over the top which is in 5.1 AC3 but the first export only one clip came out, not everything in the timeline and no audio so sent to Compressior and it asked for settings so added them and Compressor said the sound was 5.1 surround and I processed and it burned to DVD but no sound!
You're all probably laughing as it's probably so simple I'm overlooking something that's most likely staring me in the face:
What I need to know is once I have all of my video clips, transitions and 5.1 sound in FCPX - how the **** do I get that onto a DVD or Blu Ray disc that will play all of the footage and in 5.1 Dolby Digital?
Any help will keep me from pulling my hair out!
Thanks
Dan

Be sure you have nothing selected in the timeline, especially ranges. If you have a range selected, only that range will export.
In 10.0.6/7 in the Share menu you can go out either SD DVD or Blu Ray DVD, and if the audio in the timeline is surround sound, the dics should encode that way. But be sure the timeline/project is set for surround sound.
If this is a Project timeline, go to the Project library, highlight the project, go to the Inspector, the bottom right is a button with a wrench icon. Click that and verify that "Audio Channels" is set to "Surround".

Dolby Digital Encoder Does Not Support Any Encoding Options

Is it just me, or are there no encoding options for the Dolby Digital encoder other than the bitrate?
How are you supposed to select the dialog normalization, dynamic range compression profile, etc. for your audio? Without these parameters set correctly, the audio will not be encoded correctly.

@jbowden:
> Adobe licenses the AC3 encoder that Encore uses from Dolby Laboratories. This is stated quite clearly in the splash screen, the box, and other materials distributed with Encore.
I didn't say otherwise. But what they license is the code, not the implementation. Implementations are supposed to be submitted to Dolby for approval, and I'm surprised that Dolby approved the implementation given the oversights and encoding quality.
> It's a consumer-level encoder, and if you look around this forum I think you'll find very few posts about audio quality, which would seem to indicate that Encore provides acceptable audio quality for most users. Cases with audible clipping can occur if the input signal is too high...keeping your audio signal around -6db should eliminate any clipping.
I don't buy into this whole argument about "consumer-level" and "professional-level". What is the exact difference? Dolby's code is constant across all licensed encoders, so any differences in encoding are the result of an implementation difference, and that's Adobe's fault, not Dolby's.
Audio signals are audio signals. Why do I have to keep my audio from peaking above -6dB with the Adobe encoder? I can take audio whose peaks go all the way up to 0dB and encode it with the Sonic Foundry encoder with no problem -- no clipping, no volume pumping, etc. Not so with Adobe Encore's implementation.
@Neil Wilkes:
> As far as Dialnorm goes, again I say it is pretty meaningless in a stereo file.
Dolby's encoding guidelines documents seem to say otherwise. In my readings, it seemed pretty clear that the decoder must have the dialnorm parameter set to the LAeq level of the dialog in the audio regardless of channel configuration.
> I suppose, although as long as the stereo mix is actually set up correctly there is no need to invoke DRC. The only time DRC would be needed on a stereo file is if the thing is too darn loud.
I have to disagree with this. There is a LOT of material that can benefit from DRC, both soundtracks that contain a large dynamic range (explosions to whispers), and soundtracks that have small dynamic range (speech). DRC doesn't have anything to do with the overall volume level of the soundtrack, but the dynamic range of the soundtrack. If the soundtrack is too loud overall, that's not a DRC problem, that's a level problem.
> In a properly balanced stereo file, there is no need at all for DRC or Dialnorm. There is no centre channel containing dialogue, just a phantom centre, so what are you going to reference it to, please? How can you attenuate the left/right channels with reference to the centre channel dialogue when there is no centre channel present?
Just because the dialog isn't isolated in the center channel doesn't mean you can't use it to set the dialnorm parameter. Plus, the decoder doesn't attenuate the left/right channels with reference to the center channel, it attenuates the entire soundtrack on playback.
Your quote from Dolby labs is very correct. Following that procedure ensures that the decoder, when it applies attenuation based on dialnorm and applies DRC will work as intended.
> Additionally, it is not referenced to average RMS either. RMS is close to the correct way to measure, but not correct.
That is true. However, I don't have any equipment to measure LAeq directly, so RMS of a dialog section of my audio will have to do. I do know this: When I applied to Dolby for logo usage on my DVDs, they requested samples of my DVDs for approval of my methods. My first submissions (where I didn't bother with dialnorm & DRC) were rejected, and Dolby sent me a letter telling me such. After I produced further DVDs using my method in my Doom9 post and resubmitted the DVDs to Dolby, they were approved. I can only conclude that my method, while not perfectly accurate, is good enough to qualify for Dolby's rigorous standards.
The bottom line is that I feel I have enough evidence to conclude that the DD encoder implementation in Encore is substandard. If you or anyone else feels it meets your requirements, then use it. But I for one will not allow a single DVD to go out from my company with audio encoded with this encoder.

Compressor - Dolby Digital 5.1 AC3 encoding problem

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