BluRay Setting Question

Julius_ wrote on 10/23/2014, 10:41 AM

Hi,

I've been burning blurays without any problems using the template:
"Blu-ray 1440x1080-60i, 25 Mbps video stream"
Max: 30,000,000
Avg 25,000,000
Min 20,000,000

I also see this template
"Blu-ray 1440x1080-60i, 8 Mbps video stream"
Max 9,000,000
Avg 8,000,000
Min 2,000,000

Why is there such a large difference in the bit rate between the two? It's like having DVD quality no?

The DVD template is:
"DVD Architect NTSC Widescreen video stream"
max 9,000,000
avg 8,000,000 (I modified it)
min 2,000,000 (I modified it)

The sony template is
"Blu-ray 1440x1080-60i, 10 Mbps video stream"
bit 10,000,000

I don't get why it varies so much...I've been using "Blu-ray 1440x1080-60i, 25 Mbps video stream" and I just lower the Max,Avg setting at times to make it fit on a bluray disc.
Why would someone use the "Blu-ray 1440x1080-60i, 8 Mbps video stream"?

Thanks

Comments

diverG wrote on 10/23/2014, 1:45 PM

Maybe the end user (recipient) does not require a high bit rate, just a small file.

PeterDuke wrote on 10/23/2014, 5:51 PM

If you are starting off with MPEG 4 AVC, then match the bit rate to it, or a little higher, so as to not lose too much quality during re-encoding. If you are starting with MPEG 2, and you are encoding to MPEG 4 then you can halve the bit rate approximately. If the end user does not require the absolute best quality, then you can reduce the bit rate and save storage.

The lower bit rate option is for times when high quality is not important and storage space or streaming throughput are more important. Perhaps it is also a legacy of early web sites or portable devices.

Julius_ wrote on 10/23/2014, 7:39 PM

I use a Canon 7d and the files are .mov
I would have to encode to mpeg-2 (bluray) with the highest quality but making sure it would play on all players.

The bitrate by mediainfo shows 44.3 Mbps, but there's no way you can burn a Bluray at that rate and expect it to play in all players....so I guess, I'll stick with the template " Blu-ray 1440x1080-60i, 25 Mbps video stream". I just don't know why the DVD template is the same of the BluRay one.

On the timeline(right mouse click on clip), vegas displays:
General
Name: IM2_5709.MOV
Folder: D:\Capture\Larisa_Mike\Footage\Fitting
Type: Sony AVC
Size: 38.91 MB (39,842,057 bytes)
Created: Wednesday, August 27, 2014, 1:58:35 PM
Modified: Tuesday, August 26, 2014, 12:23:58 PM
Accessed: Wednesday, August 27, 2014, 1:58:35 PM
Attributes: Archive

Streams
Video: 00:00:07.140, 29.970 fps progressive, 1920x1080x12, AVC
Audio: 00:00:07.140, 48,000 Hz, Stereo, PCM

ACID information
ACID chunk: no
Stretch chunk: no
Stretch list: no
Stretch info2: no
Beat markers: no
Detected beats: no

Other metadata
Regions/markers: no
Command markers: no

Media manager
Media tags: no

Plug-In
Name: compoundplug.dll
Folder: C:\Program Files\Sony\Vegas Pro 12.0\FileIO Plug-Ins\compoundplug
Format: Sony AVC
Version: Version 12.0 (Build 770) 64-bit
Company: Sony Creative Software Inc.
===================================================
Here is MediaInfo:
General
Complete name : D:\Capture\Diego_Rosa\Footage\Canon\MVI_5829.MOV
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt
File size : 11.8 MiB
Duration : 2s 236ms
Overall bit rate : 44.3 Mbps
Encoded date : UTC 2014-07-26 07:37:49
Tagged date : UTC 2014-09-21 03:16:04

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L5.0
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=15
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2s 236ms
Bit rate : 42.7 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Original height : 1 088 pixels
Display aspect ratio : 16:9
Original display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.687
Stream size : 11.4 MiB (96%)
Language : English
Encoded date : UTC 2014-07-26 07:37:49
Tagged date : UTC 2014-07-26 07:37:49
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M

Audio
ID : 2
Format : PCM
Format settings, Endianness : Little
Format settings, Sign : Signed
Codec ID : sowt
Duration : 2s 236ms
Bit rate mode : Constant
Bit rate : 1 536 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Stream size : 419 KiB (3%)
Language : English
Encoded date : UTC 2014-07-26 07:37:49
Tagged date : UTC 2014-07-26 07:37:49

Rob Franks wrote on 10/23/2014, 10:45 PM

Why are you burning 1440 when your native resolution is 1920?

john_dennis wrote on 10/23/2014, 11:31 PM

If your Canon source is 1920x1080-29.97p, why are you using the 1440x1080 pixel dimensions?

I would be prone to use the (Vegas Pro 12) Mainconcept AVC/MVC / Blu-ray 1920x1080-60i 25 Mbps render template. Or alternatively, I would use the Sony AVC/MVC / Blu-ray 1920x1080-60i 16 Mbps template and change the bit rate to the maximum of 21,999,616 bps.

I've honestly never been curious about why the render templates with lower bit rates exist since I rarely use the default bit rate.