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sy2002

Blue Ray 1920 × 1080 Movies / Discs

Question

Hi,

 

using the newest version of Toast 10 Titanium on a Mac Pro with an external USB LaCie Blue Ray drive, I dragged a H.264 encoded MP4 file having 1920x1080p 25fps 20 MBit/sec bitrate PAL movie into Toast. After that I went to custom encoding settings modified the bitrate to 20 MBit/sec, because I wanted to ensure that the output quality matches the one of the input file.

 

I left all the other options as "automatic".

 

What I got was a 1280x720 Blue Ray movie.

 

I must admit, that the resulting Blue Ray disc nevertheless looks great on my TV, and it worked fine, but since I am using PS3's Blue Ray player for playback and since my TV supports full hd 1080p, I'd strongly prefer to actually use it instead of 720p.

 

Does anybody here know:

 

1. Why is Toast transcoding / re-encoding at all? (Above mentioned try was my first Blue Ray. I thought, that a H.264 file having above-mentioned specs could by burned 1:1?)

 

2. Did I make a mistake or is Toast not able to burn full hd Blue Rays?

 

Thank you and kind regards

Sy2002

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6 answers to this question

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Download MediaInfo Mac and use it to check the pixel sizes of the source and final files.

 

Actually, as you know: you don't really want Toast to RE-encode a file that is already compressed for Blu-ray (as H.264). Obviously it's nearly (but not quite) in a format that Toast can leave alone for Blu-ray use.

 

Maybe MediaInfo Mac might shed some light on the source file, its exact format and why it was re-encoded.

 

(BTW: Toast definitely CAN burn full HD 1920x1080 BDs - that's all I ever do!)

Edited by mooblie
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Thanks a lot for your reply! Did I get you right, that *if* I feed the right file into Toast, it is smart enough for not trying to to re-encode?

 

Here comes the output of MediaInfo (which confirms that I have 1920x1080). Any ideas for tweaking my encoder settings?

 

Thank you and best regards

sy2002

 

* * * MediaInfo Mac 0.7.36.0 file analysis report.

* * * MediaInfo Mac is ©2010 by Diego Massanti - http://mediainfo.massanti.com

* * * MediaInfoLib by Jerome Martinez - http://mediainfo.sourceforge.net

Created on: 27.01.2011 23:43:06 MEZ

Report for file: Flitterwochen-1080p.mp4

 

General / Container Stream #1

Total Video Streams for this File.................1

Total Audio Streams for this File.................1

Video Codecs Used.................................AVC

Audio Codecs Used.................................AAC LC

File Format.......................................MPEG-4

Play Time.........................................39mn 18s

Total File Size...................................5.66 GiB

Total Stream BitRate..............................20.6 Mbps

Encoding Library..................................Apple QuickTime

Video Stream #1

Codec (Human Name)................................AVC

Codec (FourCC)....................................avc1

Codec Profile.....................................Main@L4.1

Frame Width.......................................1 920 pixels

Frame Height......................................1 080 pixels

Frame Rate........................................25.000 fps

Total Frames......................................58974

Display Aspect Ratio..............................16:9

Video Standard....................................PAL

Scan Type.........................................Progressive

Color Space.......................................YUV

Codec Settings (Summary)..........................3 Ref Frames

QF (like Gordian Knot)............................0.395

Codec Settings (CABAC)............................No

Codec Settings (Reference Frames).................3

Video Stream Length...............................39mn 18s 960ms

Video Stream BitRate..............................20.5 Mbps

Video Stream BitRate Mode.........................VBR

Bit Depth.........................................8 bits

Video Stream Size.................................5.62 GiB (99%)

Video Stream Title................................Apple Video Mediensteuerung

Video Stream Language.............................English

Date of Original Encoding.........................UTC 2011-01-20 21:55:17

Color Primaries...................................BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177

Transfer Characteristics..........................BT.709-5, BT.1361

Matrix Coefficients...............................BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177

Audio Stream #1

Codec.............................................AAC

Codec (FourCC)....................................40

Audio Stream Length...............................39mn 18s 938ms

Audio Stream BitRate..............................128 Kbps

Audio Stream BitRate Mode.........................CBR

Number of Audio Channels..........................2

Audio Channel's Positions.........................Front: L R

Sampling Rate.....................................44.1 KHz

Audio Stream Size.................................35.8 MiB (1%)

Audio Stream Title................................Apple Ton Mediensteuerung

Audio Stream Language.............................English

Date of Original Encoding.........................UTC 2011-01-20 21:55:17

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Frame Width.......................................1 920 pixels

Frame Height......................................1 080 pixels

Frame Rate........................................25.000 fps

Video Standard....................................PAL

Scan Type.........................................Progressive

1920x1080 25 fps progressive is not part of the Blu-ray specification. It could be encoded as 50i (50 interlaced fields per second) ("25PsF"). I don't think the transition from 25p to 50i can be done completely lossless, though.

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Thank you for your valuable feedback.

 

So do I get you right, when I sum it up to:

 

Blue Ray specs say: Either I need to go with a "low resolution" (720p) and in this case I have the progressive picture - OR - I can have a high resolution (1080i), but in this case, I need to live with the "slobbery" effects of interlacing. (Admitably, those effects are not too visible, but in fast scenes, they are.)

 

Is this a somehow correct summary?

 

That also means, that if I would encode in h.264, 1920x1080 - 50 frames per second *interlaced*, Toast would not need to re-encode and "just burn" the Blue Ray disc?

 

And a last question (sorry for having so many ;-)):

 

What would you guys suggest me to do, i.e. what looks better on a full HD TV (using a ps3 as Blue Ray player): 720p or 1080i? Is there some "rule of thumb" what is the better quality?

 

Does it depend on the input material? The input is coming from a Sony HDR SR-1 AVCHD cam, that natively produces an interlaced 1440x1080 (so having rectangular 1.3333333 aspect ratio pixels). I used iMovie to expand it to square pixels and got then a non-interlaced 1920x1080 video as base. Looks **great** if I watch it on my Mac and my goal is to bring that to Blue Ray, so the question arises, if, coming from that kind of input material 720p is "better" than 1080i? Or is it better to "re-interlace" my 1080p to 1080i?

 

Thank you

sy2002

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...but I need to live with the "slobbery" effects of interlacing.

Eh, no. I think the 50i is created from the 25p by splicing the frame in two interlacing fields, showed consecutively. The source for the two fields is from the exact same timecode, thus not producing the combing effect usually associated with interlaced footage. I think it would look very much like 25p.

 

720p or 1080i?

I'd go with 1080i for your cam's specs, based on what I expect to happen as described above.

And I would try a 1 minute clip with both settings just for judging the results.

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