Why isn't ADR included in actor's dialogue track ?
On large budget projects a very large percentage of of the dialog is ADRed. What happens
is the first very rough edit of the film is put together during the shoot. The Supervising
Sound Editor watches these along with everyone else and puts together the ADR cue sheet.
S/he will always err on the side of caution; if there is even the slightest chance the production
dialog cannot be salvaged the scene goes on the ADR cue sheet. A production sound editor will
work with the existing edit and use dialog from alternate unused takes if needed. The ADR is
recorded and an ADR editor puts together the ADR track. Both completed tracks, production
sound and ADR, are presented to the mix team. At the time of the final mix the rerecording
mixer works with the production sound track first, and will do noise reduction on the production
sound. If there is no way to salvage the production sound then, with the assent of the director,
the rerecording mixer will use the ADR. That is why they are on adjacent tracks.
What is surprising is how much of the production sound the rerecording mixers can salvage.
However, they are using the best NR software there is, and often several at the same time.
This requires huge amounts of real-time processing power. It is not unusual to have Izotope RX,
Cedar, Izotope RX and Waves Restoration on a single channel (yes, I know the RX is on there
twice) in addition to an EQ or two and a dynamic processor. Anyway, as I was saying they may
only use a small percentage of the ADR that was recorded (they ADRed 70% of the film but only
used 10% in the final mix).
What is also cool is that some rerecording mixers send ADR tracks out to external processors that
actually add a little noise and personality to the ADR dialog so that it is easier to more closely match
the production sound. In this circumstance it is much easier to do an outboard send and return on
an individual track rather than automating it every time an ADRed line appears.
Again, you have to remember that these are established protocols for the big audio houses, but all of
us little guys follow these protocols assiduously. Why? Because sometimes they farm stuff out, and
when you send your tracks back they had better conform to their work flow, or you won't get any
further work.
Why should an up-and-coming filmmaker be aware of these protocols? Let's say you have $1,000 for
audio post. At $25/hr that's only 40 hours of audio post time. If the sound editor/mixer needs to
spend three or four hours reorganizing the audio that's 10% of your audio post money wasted.
Any special technique or simple tip to have the cleanest dialogue possible ?
Have the production sound recorded by a professional sound team. In audio post have it mixed
by a professional rerecording mixer. That will get the you cleanest dialog possible.
It's all about the proper techniques and the proper tools; you need to learn the same lessons and
do the same things the professionals do. Using budget equipment makes the job more difficult,
and the smaller the budget the more difficult it is because you need to overcome the deficiencies
of inadequate equipment.
I shot a little clip recently where I had to interview I few people and
edited very very quickly (every interviewee would say one word or two no more and I jump to
another one). Since it's just interviews, I didn't touch the sound at all, but I was wondering how
would I have done was it for a short movie purpose.
The approach is different for ENG work, where extremely fast turn-around time is essential - hours
(or even less) instead of months or years. There are also established protocols for ENG audio, but
the capture process is also a bit different. Once you get into the realm of documentaries the protocols
are the similar to narrative projects.