2. An I-frame format inherently has to use a higher data rate as each frame is encoded separately. In the other AVCHD formats the media is encoded using groups of pictures where only the first frame of the 15 frame group is a fully encoded frame of video. This is obviously very difficult to process for a computer, especially for a video editing system that has to edit on any single frame not only on I-frame at the head of the 15 frame GOP structure. Bottom line I-frames better for editing, bigger file sizes. All production formats and intermediates, especially those used for effects and color processing, need to be in I-frame formats like ProRes.
… The top format is a proprietary format Panasonic promotes as "Full HD". …
just as an addendum what Tom already said:
no, it's not proprietary - it's fully compliant with AVCHD v.2, which allows fullHD framerates beyond 29.97 and bit-rates beyond 24mbps (and 3D and some other nonsense).-
using here for a couple of days now a hvc707 (=European version of the 700, 1080/50p with 28mbps) - works like charm! great fun to use 1080/50p in a 720/25p project, applying re-framing and slowmo 'without quality loss', the sensor (1/2", large for a consumer cam …) allows nice DoF, etc etc etc.
a beast on a shoestring budget, although a bit tiny in my hands …
Thank you, Karsten--the Panasonic manual doesn't give that spec. And thank you Tom, that's a good explanation, that iFrame doesn't use keyframes (right?). Do you think it's worth the "half resolution" in each dimension? (but now that it seems this camera downconverts 1920 to 1440 anyway, it's more like 3/4 resolution in that dimension...)
Are you both saying I could shoot in "Full HD" and import it into Final Cut without any extra plugins? When they say "1080/60p scenes cannot be imported to a Mac", they're assuming Mac users only use iMovie?
For most projects I have used iFrame, but on a project that had a possibility of some clips winding up on broadcast someday, I shot in HG mode. It took 2x real time to import, and clips for a simple concert/documentary used 225 GB on the hard drive after import.
Lacking a pro camera, which format would be best to shoot in if you knew it might be on cable someday, not just YouTube?
… Are you both saying I could shoot in "Full HD" and import it into Final Cut without any extra plugins? When they say "1080/60p scenes cannot be imported to a Mac", they're assuming Mac users only use iMovie? …
yes, and yes: every Mac comes preinstalled with iMovie - and the actual version iM11 (vers9) doesn't handle AVCHDv2 = no 1080/60p .... in FCPX = importing. The software most cam manufactures add to their boxes is Windows-only = so no 'free lunch' for Mac users.
… Lacking a pro camera, which format would be best to shoot in if you knew it might be on cable someday, not just YouTube?
I would use the max, 1080/60p ... ok, its bitrate is about just half, what broadcasters ask for (BBC or German TV ask, aside many other specs, for >50mbps, min), but meanwhile they are not shy to 'quote' YouTube.videos in some shows
and fancy GoPro 3 offers a max of 35mbps, and no broadcaster cared, if Herr Baumgartner had a few bits or bytes more to offer on his strato dive .....