And are you suggesting that we DON'T even really NEED a Dolby theatrical 5.1 mix, just a plain-Jane no-name theatrical 5.1 mix should be fine at four outta five festivals? That'd be nice.
Yes and no! Technically you can't put a Dolby 5.1 mix on DCP, it has to be raw wav files. You can also put the 6 raw wav files on a BluRay and even a DVD, although on a DVD this might take up more bandwidth than available, reducing the bandwidth available for the video. So technically you do not need a Dolby mix, however there are two points to consider:
1. All HDTV's, computers (inc. laptops) and consumer AV Receivers, as well as all DVD and BluRay players with audio outputs have licensed Dolby hardware/software inside to decode a Dolby datastream. The advantage of this is that when you submit your film to a festival the initial assessment will take place on a computer or TV, probably only with stereo capability. The Dolby hardware/software will automatically downmix your 5.1 mix to stereo if that is all their playback device supports. This automatic downmixing may or may not happen with the 6 raw wav files and the people assessing your submission may therefore not hear any audio at all or may only hear the L and R (IE., No center channel dialogue).
2. To avoid translation problems which could be so severe that your film is unwatchable in a cinema, the
very least you should do is have your mix checked in a theatrical dub stage. Not just to check if the fine details of your mix still work but to check you haven't made some calibration or other common level mistake which could render your dialogue inaudible when played back on a calibrated theatrical system.
Every dub stage suitable for theatrical mixing (or checking a theatrical mix) is Dolby certified. So while you don't technically need a Dolby certified theatrical mix (unless you are submitting a 35mm film), in practice it would be a huge risk not hire a Dolby certified theatrical dub stage (if only for a couple of hours to check your mix). This might seem like a semantic difference but it's not. A Dolby certified mix requires the presence of a mastering technician employed by Dolby (IE. Not employed by the dub stage) and requires the creation of a Dolby print-master, this adds significant expense which is not incurred if all you are doing is checking your mix in a Dolby certified dub stage.
Just to be clear, you do not need a licence from Dolby if you create a Dolby mix yourself and put that mix on a BluRay, DVD or HDcam (or for broadcast TV either BTW). You only need to contact Dolby for a licence for a Dolby 5.1 mix on 35mm film or if you wish to use any of the Dolby logos.
I think this borders on a personal attack, and is both unfounded and uncalled for. I'm not sure just what it is that you think we don't get, APE. Yeah, we know that what we're producing is nowhere near theatrical standards for audio. Thanks for rubbing it in our faces. If we had the money, I assure you, we'd spend it on audio. But we ain't got the money, bro, and that's why it's incredibly more helpful when you simply give us advice on how we can make do with what we have.
Some of what I said may have sailed a bit close to the wind but I don't believe it was either unfounded or uncalled for. As I said in a previous post, I totally get that indie filmmakers here have limited means and cannot afford commercial theatrical quality 5.1 audio. The solution of "doing the best you can with what you've got" does not apply in this situation because you have absolutely no way of knowing if what you are doing is "the best you can", as you don't have any way of knowing if what you are doing is great, mediocre, crap or completely unwatchable!
My expert advice is NOT to attempt to create a theatrical 5.1 mix without any budget, due to the risk of unknowingly creating something completely crap or unwatchable but instead to take a far less risky middle route and create a 3.0 mix. When someone contradicts the audio information I've posted, provides highly inaccurate advice and and thereby questions my expertise, that too is a personal attack, even though it may not appear insulting. IMO that makes a stiff rebuttal justified and also in the interests of other indietalkers.
I know that indietalkers want to hear solutions and being told that something is impossible or should not be attempted completely goes against the grain and might even raise some hackles. But, just as with the visual side of film making, there are certain things you just can't do and shouldn't even attempt with sound without a fairly serious budget. Indie filmmakers accept this fact when it comes to the visual images but even knowing next to nothing about sound are still willing to argue and mislead others into believing that the same is not also sometimes true with sound.
To answer the OP's question, if the audio is in sync at home, it'll be in sync at the theater. If you require blu-ray, just give them a blu-ray, no need to toy with the sync.
This is certainly not always true! There are a number of factors which can make the "sync at home" not sync elsewhere or particularly in a cinema. Commercial dub stages spend a considerable amount on specialist sync equipment to avoid those factors. If I could have avoided buying all that sync equipment, I surely would have, but I need to be able to guarantee A/V sync, probably or possibly getting accurate sync is not good enough for me personally. I'm not suggesting that those without the proper sync equipment should "give up" but I am saying that indietalkers should at least be aware that sync can be a complex and tricky subject and that assuming it will be OK because it syncs at home will one day bite you in the a$$. As with many things regarding sound here on indietalk, if you are going to DIY audio then by definition you need to "do it yourself", being ignorant of, ignoring or denying an issue is not DIY!
Every other fest I screened at projected my 2.0 mix, and it sounded just fine (I do not mean to say that it was professional quality, only that it sounded as good at the cinema as it did in my home).
I'm sorry Cracker but unless you were sitting somewhere along the center line of the cinema, this statement cannot be true. If you were not sitting along or very close to the center line and you really did not hear any problems there are only 3 possible explanations:
1. Unlike a general audience, you were so fixated with the visual images alone you did not notice the audio problem.
2. You are completely deaf in one ear or have some other very serious hearing impairment.
3. You or the festivals in question have implemented some new technology which circumvents the accepted facts in the science of psychoacoustics.
I'm just speculating here, but I can't help but suspect that the reason the audio was funky at one of those fests might've been because they were using an older system? At this particular fest, they screened it at a newly-renovated old-timey theater. But it wasn't a big-budget corparate renovation, more like an indy DIY renovation. I dunno if that contributed to the problem, just guessing.
No Cracker, I explained why it happened. A Dolby decoder was trying to decode a LoRo mix which had been created with some phase inconsistencies. If anything, the problem you experienced is more likely in a newer cinema and at bigger festivals and this is why the bigger festivals often don't even accept an LoRo mix for screening. It was even discussed in the article Ray linked to above: "... you might have a stereo mix, but it's actually being run through the Dolby decoder, so some strange audio problems can arise--like dialogue being "tugged" into the surrounds... We run into problems with mixes done by a Pro Tools expert in his basement who has never listened to the track properly and is shocked when the content does not play back properly.":- By "never listened to the track properly" they mean at least checked the mix in a real theatrical dub stage.
By the way, if all you're concerned with is what format the festival is asking for, if they're okay with blu-ray as a screening copy, I find it highly unlikely that they'd need anything other than boring-ol' 2.0 stereo. That being said, if there's an affordable way to wrap your 2.0 mix in a 5.1 format, that sounds kinda cool, no?
Not necessarily. It's possible, depending on how their BluRay player is patched into the audio system, that they can't unwrap the 5.1 format, it's also possible that the decoding process causes delays which affect sync or for there to be one or two other potential problems. Encountering one of these problems is more likely at one of the smaller film festivals. Providing it works, encoding an LoRo mix in Dolby Digital should avoid it being decoded as an LtRt mix and therefore avoid the problem of the dialogue or other audio elements suddenly jumping to a completely different speaker but does not does nothing to solve the problem of no center position in a stereo (LoRo) mix.
Most small festivals expect a standard stereo LoRo mix, give them anything else (3.0 or 5.1 for example) and you
might find your film being screened with no sound (if it's screened at all). On the other side of the coin, the bigger festivals may accept almost any audio format EXCEPT a standard stereo LoRo mix for exhibition! Have a read of the article Ray linked to in post #13, then take their advice and ask the right questions.
G