1080p23.976 Timeline to Blu-ray 1080 29.976

discburn wrote on 12/18/2014, 5:31 PM

Normally, when I have 23.976 footage, SD or HD, when I'm burning to DVD, I choose NTSC 29.976 and set scan type to Progressive. This gives me, I believe, 3;2 Pulldown (or something like that!) and my NTSC DVD looks just like 23.976 on playback.

VPX6, amazingly!, has no Mpeg 2 Blu-ray 1080p23.976 (even though it is a Blu-ray standard). Nor is it possible to make one out of the presets available. So, one is forced to use the H.264 Blu-ray 1080p23.976 preset. This plays back perfectly on some BD players, but with occasional audio glitches on others, and badly on others again. However, the Mpeg 2 Blu-ray formats play perfectly right across all BD machines I've tested.

So, I have to output my 23.976 Timeline similarly as with DVD, above, except now I'm going to Blu-ray Mpeg 2 1920 x 1080 at 29.976. The Blu-ray spec here is Interlaced, so should I set my scan type to Progressive (like for DVD above) or leave it at Interlaced? Is there some kind of 3:2 Pulldown going on here too? I've checked some short BD file exports with both Progressive and Interlaced settings, but I can't see any difference at all! They both play back equally fine. But, when I start to burn a disc, what will happen, and if both look the same, is one better?

I have burned an AVCHD 1080p23.976 disc and it plays perfectly across all machines. And, possibly lowering the bit rate of H.264 BD 1080p23.976 might play properly everywhere. But Mpeg 2 BD processes extremely fast, so that's why I'm looking in that direction.

Appreciate some insight into this.

Seamus

Comments

johnebaker wrote on 12/24/2014, 5:32 AM

Hi Seamus

Are you in Europe (PAL) or the US (NTSC)?

I find your post confusing with what you are doing or require.

For instance you are using 24fps material and burning DVD at 30 fps NTSC progressive for DVD which indicates you are in NTSC land.

Yet for the Bluray spec you say the standard is Interlaced which indicates you are in PAL land.

Unless of course you are sending the discs to another TV standard area.

. . . . should I set my scan type to Progressive (like for DVD above) or leave it at Interlaced . . . .

Ideally you match the scan type to the same as your source material.

However if you have mixed interlace and progressive material then you will hit the problem of de-interlace effects of the interlaced material if you select Progressive or the interlacing effect of the progressive material if you select Interlaced. Both usually exhibit themselves as 'combing' where there is movement across the screen or in pan shots.

In this case you will need to select the best case option.

Also I would avoid changing the framerates If you can - Pulldown also creates issues ie 'jerking' of the video where there is movement across the screen or in pan shots

BD players should not be specific with respect to whether the disc is encoded interlaced or progressive. They must be able to play both.

HTH

John