Qyot27 wrote:No, I meant 1080i30 - I default to referring to fps by the proper # of frames, no matter whether the method is interlaced or progressive. 30 frames per second, interlaced, rather than 60 fields per second, interlaced (in which case saying 'interlaced' is redundant). The European Broadcasting Union denotes it in a similar manner, 1080i/30 or 1080i/25 - I'm just too lazy to bother putting a slash in there like they do.
Ah, I see. The lack of a slash threw me off. I prefer using the U.S./Japan broadcasting terminology since when it comes down to it, 60 fields isn't always exactly 30 frames. Which is why some U.S. broadcasters use 720p60 capture/transmission to avoid de-interlacing artifacts when shown on progressive scan devices (pretty much all modern HDTVs). Logically, the EBU notation is more consistent since the final number is always frame rate (instead of scanning frequency), but after working with NTSC (and now ATSC) devices for over a decade, I'm kinda set in my ways.
Qyot27 wrote:When you mention field pairs though, are you talking about [essentially] pulldown flagging (I assume not, considering you're talking about deinterlacing on playback)? Faking out a player by using the interlaced flag on progressive footage? I've seen talk of that on Doom9, but the general impression I got from there is that it's iffy whether all Blu-ray players support it, or whether it's simply an assumed trait.
The point being, that unlike DVD where you could have a progressive 29.97fps stream stored as Progressive, you're not allowed to do that on Blu-ray for whatever stupid reason (no matter what resolution you're talking about - 480, 720, 1080: all of them say i60, not p30). Sure, you can reconstruct 1080i into 1080p using TFM just like you can do with DVD footage, but 'reconstruct' and 'supports 30 fps progressive' are two different things. '30p' means it had better be stored progressive, no reconstruction necessary. Hence the flagging trick I mentioned earlier that doesn't seem to be spec-compliant even if the players accept it.
I meant using interlace flags to store 30fps progressive footage (essentially tricking the players to do
Progresssive segmented Frame playback). I'm in the camp of assuming that most BD players will handle 30PsF progressive footage flagged as interlaced properly. I actually have all the hardware I need to confirm whether my stand-alone players support it (PC burner, PS3, BD player), but it hasn't been a priority. It's only recently when 1080p30 (29.97) recording capable cameras (DSLRs such as the Canon EOS 7D) have become popular that the question has risen to importance.
I'm actually still a bit surprised that while the ATSC spec allows for a 1080p30 format, Blu-ray (which was finalized much later) ignored it. Although, again, until recently there was very little professional-level hardware that used that format.
And there may be a way to store 29.97fps footage on Blu-ray: record it as 720p60 (59.94) with duplicated frames. This is how 30p video is recorded on
AVCHD Lite cameras. Although now you are dropping resolution down...