On 12/08/2010 07:18 PM, jimlux wrote:
Chris Albertson wrote:
Adding time code to video would be redundant. All video is already
time coded.
All *digital* video is timecoded..
No, not all digital video. The time-code is optional in many of the
transfer formats.
Record that video on an analog 1/2" or 3/4" deck and you need the
timecode on the longitudinal audio track. Yes, primarily as you say, to
support editing.
It's been 12 years since I sat in an edit bay, so I'll bet that analog
gear is pretty much out of the picture by now, though.
Analog black-bursts is still here.
But many consumer level cameras "fake" it by defining time = zero at
the start of a
tape or the first frame in memory. If absolute time needs to be record
on a
consumer level camera then I'd shoot a few frames of a digital clock
and then
later in a video editor adjust the time code
That would work..(e.g. it's just like slating at the beginning of a film
take) Sometimes it would be more convenient to just record an audio
timecode on the audio track.
Where I could see timecode being handy is when you're trying to do
automated processing. I worked on a system 15 years ago where we had 100
cameras, and we did the alignment by hand, and it was pretty painful.
What's easy when syncing A and B roll gets tedious when there's 100
takes you're essentially cutting together.
For Cameras it is not actual time which is important, but frame and line
alignment needs to be aligned. Digital video mixers has line-stores on
the input, so the cameras only needs to be synced to within a few lines
such that the line-store can solve the rest.
If you fail syncing up you need to use a frame-store, which you try to
avoid since it adds 40 ms of delay and you drop/duplicate frames. Even
if you cut between the frames on the editing line, it is still a
degradation you want to avoid, so syncing cameras is a good thing.
Taking the effort to sync up kind of make sense when you look on the
alternatives.
Cheers,
Magnus
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