Varicam @ 23.97 with a Sound Devices 744T ?

[John Sharaf]

Easy,

Here’s a link to a pretty good site with a lot on HD info, this particular page to audio:

https://www.jkor.com/peter/doublesystemsound.html

Basicly, you want to shoot audio at 29.97 NDF which is what it will eventually play as if broadcast (although the final online will be recorded as DF).

When you create a 24p project to edit in post it will still sync at the whole second.

Same frame rate applies with Varicam at 29.97 (30fps) and 59.94 (60p) and with Cine Alta also, especially because most HDCAM footage is downconverted to conventional NTSC video for offline.

JS

[James Carl]

Thanks John!

[Edward Chick]

Goodman’s Guide to Varicam recommends shooting Varicam at 60hz when recording double system sound. If you go to the RAMPS (Recording Arts Motion Picutre Sound) chat site and search through the old posts ,this issue has been addressed several times by leading sound recordists.

edward chick

[John Sharaf]

Absolutely not! Do not foloow this advice!

DO NOT SHOOT AT 60 HZ IF YOU WANT SYNC SOUND IN US OR OTHER NTSC COUNTRY

Always set the systems frequency to 59.94 in order to shoot 23.97, 29.97 or 59.94 so that the sound remains in sync.

Either Goodman is wrong or you’re misreading what he says.

Use 60 Hz systems frequency only for shooting whole number frame rates such as 25 or 50 for PAL countries and for shooting MOS shots for filmout where the shot will be intercut into A & B rolls before composite prints or internegf is struck.

JS

[Edward Chick]

Quote “if you will be doing any of the following; double system sound production, shooting in sync with film cameras running 24 frames per second, or shooting at 25 fps for down conversion to PAL; the recommended system freq setting is 60hz.
I am NOT illiterate.

edward chick

[John Sharaf]

Goodman is wrong about the “double system sound production” part; the other parts are correct.

JS

[Gary Adcock]

[edward chick] “Quote “if you will be doing any of the following; double system sound production, shooting in sync with film cameras running 24 frames per second, or shooting at 25 fps for down conversion to PAL; the recommended system freq setting is 60hz. I am NOT illiterate. “

Robert is totally incorrect here, if you look at the context of those references, he is referring to filmout assuming that you are wise enough to change the bit depth of the audio ( which needs to be at 48.048KHZ for integer recording)

DO NOT USE 60HRZ in the US for DSS recording – John is absolutely correct on this.

gary
Varicamp Post instructor
HD Post Chair for NAB 2007

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

[James Carl]

>set the systems frequency to 59.94

Got it thanks.