BD-RB: unwanted format-change 16:9 to 4:3

[Taurus50]

I was quite surprised, that the format was changed after BD-RB had finished its job:

[23:09:56] BD Rebuilder v0.36.06 (beta)
- Source: BDROM
- Input BD size: 15,23 GB
- Approximate total content: [01:32:37.039]
- Target BD size: 7,93 GB
- Windows Version: 6.0 [6002]
- MOVIE-ONLY mode enabled
- SHUTDOWN at completion enabled
- Quality: High Quality (Default), Two Pass
- Audio Settings: AC3=1 DTS=1 HD=0 Kbs=640
[23:09:56] PHASE ONE, Encoding
- [23:09:56] Extracting A/V streams [VID_00002]
- [23:21:33] Reencoding: VID_00002 (1 of 1)
- [23:21:33] Collecting video information
- Source Video: MPEG-2, 1920x1080
- Rate/Length: 25,000fps, 138.926 frames
- Bitrate: 11.146 Kbs
- [23:21:33] Reencoding: VID_00002, Pass 1 of 2
- [00:32:00] Reencoding: VID_00002, Pass 2 of 2
- [04:05:50] Video Encode complete
- [04:05:50] Reencoding audio tracks (if req'd)
- [04:06:26] Multiplexing M2TS
[04:10:23]PHASE ONE complete
[04:10:23]PHASE TWO - Rebuild Started
- [04:10:23] Rebuilding AVCHD file Structure
[04:14:32] - Encode and Rebuild complete
- WORKFILES folder removed.
- Computer SHUTDOWN initiated.

Mediainfo gave the following info about the final file:

Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 4:3


How come? And how can I keep the original ratio?

[jdobbs]

I was quite surprised, that the format was changed after BD-RB had finished its job:

[23:09:56] BD Rebuilder v0.36.06 (beta)
- Source: BDROM
- Input BD size: 15,23 GB
- Approximate total content: [01:32:37.039]
- Target BD size: 7,93 GB
- Windows Version: 6.0 [6002]
- MOVIE-ONLY mode enabled
- SHUTDOWN at completion enabled
- Quality: High Quality (Default), Two Pass
- Audio Settings: AC3=1 DTS=1 HD=0 Kbs=640
[23:09:56] PHASE ONE, Encoding
- [23:09:56] Extracting A/V streams [VID_00002]
- [23:21:33] Reencoding: VID_00002 (1 of 1)
- [23:21:33] Collecting video information
- Source Video: MPEG-2, 1920x1080
- Rate/Length: 25,000fps, 138.926 frames
- Bitrate: 11.146 Kbs
- [23:21:33] Reencoding: VID_00002, Pass 1 of 2
- [00:32:00] Reencoding: VID_00002, Pass 2 of 2
- [04:05:50] Video Encode complete
- [04:05:50] Reencoding audio tracks (if req'd)
- [04:06:26] Multiplexing M2TS
[04:10:23]PHASE ONE complete
[04:10:23]PHASE TWO - Rebuild Started
- [04:10:23] Rebuilding AVCHD file Structure
[04:14:32] - Encode and Rebuild complete
- WORKFILES folder removed.
- Computer SHUTDOWN initiated.

Mediainfo gave the following info about the final file:

Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 4:3


How come? And how can I keep the original ratio? The original was likely 1440x1080. BD Rebuilder never resizes to 1440. The numeric flags in the CLPI and MPLS only says "1080p" or "1080i" -- so BD Rebuilder assumed 1920x1080 when it printed the input type in the log because all 1080 input are displayed as 1920x1080.

A 1080 stream with 4:3 is truly 1440x1080 (with a 1:1 aspect ratio) but is displayed as 1920x1080 with black bars on the side. Sometimes the bars are embedded in the encode -- in your case they are not.

In other words, you did keep the original size. BD-RB just reported it somewhat inaccurately.

[Taurus50]

Yes, the original is:

Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9

Now, how can I keep BD-RB from changing the aspect ratio?

[jdobbs]

BD Rebuilder didn't change the aspect ratio. It doesn't ever change from 16:9 to 4:3 -- and in fact doesn't even have that capability. Is this an original disc? I suspect not -- as I've never see a commercial disc that is 1440x1080 at 16:9 -- and I don't think they likely exist. In fact -- I don't even think it is a legal blu-ray resolution/ratio combination. The standard states that a 1440 sample shall be converted to 1920 by using a 4/3 interpolation filter with 1920 being presented.

It sounds like your source has been corrupted by some type of preprocessing.

[Taurus50]

Well. it is an original disc, a documentary on Japan from a series called Golden Globe. It runs fine on my BD-player in 16:9. The file on my pc runs also fine in 16:9. So, even if it can't be, it changed to 4:3.

[jdobbs]

And? What do you want me to do? The input violates the standard. Great that it runs fine... there are lots of things that will run even though they aren't correct. The fact is that the MPLS and CLPI files have to say 4:3. BD Rebuilder reads the format from those files (where it is supposed to be) and it never, never, never, never resizes or changes aspect ratio to 4:3 from 16:9.

So how do I fix a broken disc? The answer is: I can't.

[k-c-ksum]

have you tried opening the m2ts file directly in tsmuxer. What does that report it as?