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. |
11th April 2019, 14:10 | #21 | Link |
Registered User
Join Date: Jan 2019
Posts: 9
|
A couple of tests on video content generated from still images.
#1 Lenna (preview: wikipedia.org/wiki/File:Lenna_(test_image).png; download: lenna.org), 512x512 RBG24 converted to 8-bit 4:4:4. x264vs || relative filesize 100.0% x265vs || 104.7% #2 M87* (preview: wikipedia.org/wiki/File:Black_hole_-_Messier_87.jpg; download: eso.org/public/archives/images/original/eso1907a.tif), 7416x4320 RGB48 converted to 3708x2160 10-bit 4:4:4. Do note that the original TIFF is a gargantuan 183 MB file. x264vs || 100.0% x264f || 100.8% x265vs || 103.2% x265f || 104.2% |
12th April 2019, 09:10 | #22 | Link | |||
Registered User
Join Date: Mar 2019
Posts: 8
|
Quote:
About --tskip: Quote:
About --cu-lossless: Quote:
And 1 thing I must emphasize... near-lossless = lossy. |
|||
14th April 2019, 12:10 | #23 | Link |
Angel of Night
Join Date: Nov 2004
Location: Tangled in the silks
Posts: 9,559
|
Heavily filtered video might sometimes benefit from tskip, but natural video never will. And since x265 doesn't even implement the screen coding range extensions, the actual capabilities of tskip and other screen coding tunings are very nerfed.
|
20th April 2019, 07:25 | #24 | Link |
Registered User
Join Date: Aug 2006
Location: Thailand
Posts: 8
|
The rumored Sony's new video codec XEVC which is based on HEVC version 2 claims 240Mbps peak bitrate lossless compressing 1920 x 1080, 12 bit depth, 24fps. I did a calculation and get 1:7.12 ratio.
source: https://www.eoshd.com/2018/12/sonys-...aw-at-240mbit/ |
22nd April 2019, 23:53 | #25 | Link | |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,770
|
Quote:
|
|
16th July 2019, 13:00 | #26 | Link | ||
Registered User
Join Date: Mar 2019
Posts: 8
|
Hmm?..
Quote:
Quote:
As Lagarith is sort of an old outdated codec... And more advanced codecs (like x264, x265) should have implemented similar capabilities in the algorithms. |
||
1st August 2019, 02:15 | #28 | Link | ||||
Registered User
Join Date: Sep 2007
Posts: 5,377
|
Quote:
4.8.17 intra intra indicates the relationship between frames. Inferred to be 0 if not present. value relationship 0 frames are independent or dependent (keyframes and non keyframes) 1 frames are independent (keyframes only) Other reserved for future use https://trac.ffmpeg.org/wiki/Encode/FFV1 GOP size -g integer >= 1 For archival use, GOP-size should be "1". Quote:
eg. blankclip(length=1000, width=1280,height=720, pixel_type="YV12") ie. 1001 blank frames, 1280x720 , 24fps, YUV 4:2:0 x264 --qp 0 mp4 container => 49.2kb x264 --qp 0 --keyint 1001 mp4 container => 48.6kb lagarith with null frames, avi container => 31.4kb Quote:
I have no idea what you're trying to say there Maybe try google translate |
||||
1st August 2019, 04:10 | #29 | Link | ||||||
Registered User
Join Date: Mar 2019
Posts: 8
|
Quote:
Quote:
Hint: Those numbers are file sizes in Bytes. |
||||||
2nd August 2019, 00:27 | #30 | Link | |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,770
|
Quote:
|
|
2nd August 2019, 02:13 | #31 | Link | ||
Registered User
Join Date: Mar 2019
Posts: 8
|
Quote:
And for people who came up with: general compression, motion estimation, psycho-visual optimization... such state-of-the-art stuffs. There's no possibility that they ain't aware of this. So?.. Quote:
|
||
6th August 2019, 17:15 | #32 | Link | |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,770
|
Quote:
|
|
Tags |
lossless, x264, x265 |
|
|