Re: DVCPROHD 25P 720 through firewire???? by gary adcock on Nov 30, 2006 at 4:19:15 pm
[GlennH]"Ive shot a short film recently with the varicam at 25P 720. Is there anyway of capturing this format through firewire? to FCP?"
the most current versions of FCP support the 720p25 spec over FW, and I have worked in the format via custom settings for a couple of years using my Kona Card.
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Re: DVCPROHD 25P 720 through firewire???? by mactrix on Dec 1, 2006 at 2:29:32 am
You can only capture 720p25 over 60p.
This means you choose the 720p60 DVCPRO HD Easy Setup in FCP,
and than you capture 720p60 via FireWire. You can edit this inside
a 720p60 sequence. The motion resolution of your footage is still
25p but you're dealing with duplicated frames that are embedded
into 60p. You can edit this and you can output to a video monitor
and back to tape ... always in 60p. Like this you only create one
generation if you apply filters or effects.
There is no way to capture only the flagged frames for 25p via
FireWire and there is no way to remove an advanced pulldown like
in the NTSC world. This is a fact.
To capture 720p25 or 720p50 you can only use an AJA or BMD cards
and if you capture uncompressed you will preserve image quality
but it costs a lot of disk space and performance. Capturing again
into DVCPRO HD compression will create the second generation. If
you perform filters and effects it's the third generation. Going back
to DVCPRO HD tape via HD-SDI will create the fourth generation.
Beside this I noticed wrong format conversion results when using
the AJA 720p25 setting. The sub-sampling was not applied to the
footage resulting in a 1280 x 720 clip, instead 960 x 720. I couldn't
get it work correctly yet.
If you work uncompressed you won't have these problems and you
only generate the first compressed generation when going back to
tape. Unfortunately this is your only chance and you will still have to
adjust some of the Kona settings, depending of the video device you
are using. Some 720p25 presets are made for the AJ-HD1400 and if
you're working with the AJ-HD1200 you have to adjust them to
720p59,94 input instead of 720p50. If your are using the Varicam
directly also the 720p60 setting might work, depending of the
camera setup. There is also a Mirranda adapter for the Varicam that
would again generate 720p50 ... so many combinations are possible.
All work if you do the correct FCP setup.
You can also go on my website where I've published some articles
about this. Unfortunately I can not post the link as the website is
blocked here (taking traffic from this holy website). You have to
google for "720p50 fcp" and the first two hits will bring you to the
website ...
You can contact me for further informations or instructions.
Where are you from?
