AVS HD 709 - Blu-ray & MP4 Calibration - Page 19

I'm not sure I get exactly what you're talking about unless you're using a version before the current RC1. My players take a few seconds to chapter skip, but I'd guess it's less than 5 seconds. It's long enough that if I hit chapter skip when the computer beeps I have to wait a little before telling HCFR to take the next reading. It also takes some time for my players to go from the menu to an individual section, and I suppose 5 seconds might be about right. All in all it's easier to use than trying DVE HD with HCFR. Considering the Display LT takes almost a minute to measure 0% with the average readings option, I consider it acceptable. Neither of my players are generally too snappy, so maybe it's possible that the Ulead disks are slower but I haven't noticed.

I'll assume that you're talking about using CalMAN. Bear5k mentioned having something along the lines of an autodetection for changing patterns but I've still never used the software. Like explained in the original post, the disk is primarily based upon using HCFR and as far as I know you always have to tell the software to read the next pattern. If there's a way to make the disk more user-friendly then we'll consider it, but if you're using Calman I've still never checked out that feature.



If your grayscale measurements match then you simply might want to continue using GetGray for grayscale. The different encoding between the disks shouldn't matter for grayscale if your player is decoding correctly. Where hwjohn was probably going, is the disk slower than a commercial HD DVD? Like I said, I don't remember the disk being any more of an issue than trying to take measurements from DVE HD when it would actually load on my player. Comparing this to a SD DVD is a bit pointless from my perspective because they don't use the same encoding, and software to cheaply author HD material is more limited.

That's the way the disk is authored. The Blu-ray versions are still 1080i. Ulead's software doesn't seem to accept a 24p video without transcoding as currently noted in Known Issue #2. I can modify the program's output to substitute 24p video, but I'm not sure if the alterations are actually compliant. Earlier tests on a judder video showed that the PS3 wasn't playing back the altered files correctly, but for the test we were using mpeg2 which is not actually part of the AVCHD spec.

At this point the only way that we could probably do progressive is to use 30fps, which Ulead might accept. We can send the videos that are used to create the HD DVD straight to BDMV or we could do a 30fps without pulldown for BDMV. For the AVCHD, which is the primary interest of most people due to Blu-ray burner costs, I'm not so sure that 30 fps progressive is part of the spec http://www.avchd-info.org/format/index.html Short of using software costing 5 digits I'm not aware of a way to author 24p (similar to most Blu-ray commercial disks) to both AVCHD and BDMV.

I'm not going to comment on using display images with HCFR because my impression is that DVD manual would be the way to use the disk with HCFR.

You could do a run with GetGray and then do a run with the 709 disk. You can then compare the measurements reported by each run. What you would want to look for is if the measurements are similar and within the measurement error of the probe. If you're not familiar with the measurement error of your probe (how much the same measurement can vary), then do two runs with GetGray and two runs with the 709 disk. The varation between each other for the two GetGray and 709 runs will give you an idea of how much the probe can vary. If the difference between the GetGray and 709 run is similar to the differences between the similar disk measurements then it really doesn't matter what disk you use for grayscale. Colors between the HD and SD disk will vary though and that's more along the lines for the reasoning in using an HD disk.

See "TITLES AND CHAPTERS" in the first post.

When there was the report about Sharp not working with AVCHD I took some disks to Best Buy. The BD30 there would at least load the AVCHD. My only real suggestion would be to try a different burner, but I suppose pulling the m2ts files might also work from what you said about the SD card.

THE FOLLOWING HAS BEEN CORRECTED WITH v1.0 RELEASE

I used the near white patterns for the first time today and noticed that 93% was incorrect. It was encoded as 218 instead of 220. This will eventually be changed when the disk goes to the first release.

Black is defined as 16 and white as 235. (235-16)/10=21.9 In sticking with those points there's a rounding that has to appear somewhere in a 10% grayscale from black to white. On this disk between 50% and 60% is a change of 21 and all the others are changes of 22. It's possible that this item related to rounding could show up in a gamma plot. It has been suggested an alternate way would be to use 236 for white so that all the steps of a 10% grayscale are an even 22 for plotting gamma, but white is defined as 235 so I have left the rounding item in. This sort of thing also shows up in near white and near black and other items that use small percentages because 1% is actually 2.19 but for the digital levels that were used to create the disk whole numbers have to be used.

All in all I question if the rounding item is what you're noticing. I don't necessarily consider it an error, just related to how the disk was created. This originally started out as merely a replacement for taking measurements from the DVE HD disk that wouldn't load far too often on my player and is still MIA on Blu-ray. My point is that a level change of 1 is probably within any other errors that might appear in the authoring process. The near white item was simply a clear mistake on my part unrelated to any small systematic errors that might appear in how the disk is put together.

There was some prior discussion about the BD-P1400 not playing AVCHD from DVD. Are you using a Blu-ray disk?