Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
|
|
Thread Tools | Search this Thread | Display Modes |
11th August 2009, 18:49 | #21 | Link |
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
Posts: 13,248
|
I wouldn't expect slices to make such a difference. Not at BD bitrates (36 Mbit/s).
__________________
Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ |
11th August 2009, 20:51 | #22 | Link |
Registered User
Join Date: Jan 2002
Location: France
Posts: 2,856
|
The link given by LoRd_MuldeR applies to SD (480p). 1080p with 4 slices will suffer a slightly lower PSNR loss than 480p with 2 slices, thus 0.038dB, which roughly amounts to a 0.8% bitrate loss at same quality.
__________________
|
11th August 2009, 23:34 | #28 | Link |
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
Posts: 13,248
|
So you can already tell whether there are any other problems with BD compliance in x264, in addition to the known slices issue?
__________________
Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ |
12th August 2009, 04:26 | #31 | Link | |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,752
|
Quote:
Remember Blu-ray's peak bitrate was defined for MPEG-2 applications. It's rather overkill for modern codecs. |
|
12th August 2009, 06:05 | #32 | Link | |
User of free A/V tools
Join Date: Jul 2006
Location: SK
Posts: 826
|
Quote:
Now take into account we may use H.264 instead of older MPEG-2 and necessary video bitrate can be halved for the same visual quality I suppose. |
|
12th August 2009, 12:00 | #33 | Link | |
BluRay Maniac
Join Date: Dec 2005
Posts: 2,419
|
Quote:
1. What is max allowed vbv-buffersize and vbv-maxrate for Level 4.0 from blu-ray specification (i.e for 4.1 are 30000/40000 buffer/maxrate), not H264. 2. So definitly L 4.0 dosen't require slices? can be then L 4.0 video primary video? 3. What is max allowed vbv-buffersize and vbv-maxrate for Level 3.2 from blu-ray specification for SD content, and what resoultion and fps allowed for SD, and is L 3.2 maximum for SD? 4. Is there anything about BD5/9 and special restrictions such as VBV or other? That is for now. Thanks. |
|
12th August 2009, 13:16 | #34 | Link | |
Registered User
Join Date: Oct 2007
Posts: 1,060
|
Quote:
Remember this thread? |
|
12th August 2009, 13:23 | #35 | Link |
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
Posts: 13,248
|
That's probably not the result of the bitrate, but a result of bad encoders and/or bad authoring
__________________
Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ |
12th August 2009, 14:34 | #36 | Link | |
Registered User
Join Date: Oct 2007
Posts: 1,060
|
Quote:
Didn't Dark Shikari say even with x264, you need a lot more than 25mbps to reach transparency on 1080p videos (from a master)? Last edited by Chengbin; 12th August 2009 at 14:40. |
|
12th August 2009, 15:35 | #37 | Link |
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
Posts: 13,248
|
This is highly source dependent. I'm pretty sure for most sources you will be fine with x264 and much lower bitrates...
__________________
Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ |
12th August 2009, 16:20 | #38 | Link | |
Registered User
Join Date: Oct 2007
Posts: 1,060
|
Dark Shikari, do you mind clarifying this quote in terms of what kind of source are you referring to?
Quote:
|
|
12th August 2009, 16:26 | #39 | Link |
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
Posts: 13,248
|
He mans that if you were encoding from an original lossless source ("Master"), then you would need significant more bitrate to retain all detail, because there is so much detail/grain in that source.
However we usually don't have access to such sources. What we have are BluRay's, which have already been filtered and compressed in a lossy way. Many detail is already gone for good when we get the data! Re-encoding such lossy sources requires less bitrate to retain all details (the details that are still there) for obvious reasons...
__________________
Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ Last edited by LoRd_MuldeR; 12th August 2009 at 16:35. |
12th August 2009, 16:40 | #40 | Link |
Registered User
Join Date: Oct 2007
Posts: 1,060
|
LoRd_MuldeR, I see you didn't finish reading my post, I said "from a master".
Anyway, I'm very excited to see what Lyris can do with his project using x264. BTW, p_l_e_a_s_e use the full 50GB of the disk. I've seen so many Blu-rays with low 20mbps bitrate and the disk still has 10-15GB free. But then truthfully this 40mbps cap is kind of a bottleneck. If you use high average bitrates (like Jumper's 33mbps), if you use bitrate viewer on it, it will probably look like CBR. Last edited by Chengbin; 12th August 2009 at 16:44. |
Tags |
authoring, blu-ray, compliant, verified, x264 |
Thread Tools | Search this Thread |
Display Modes | |
|
|