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#### **QaS - Quality and Size**
This is a 10-bit HEVC / x265 re-encode of [AOmundson's][aomundson release] 169.2 gb release of Tengen Toppa Gurren Lagann.
[Cerberus released][cerberus release] a similar x265 re-encode of Tengen Toppa Gurren Lagann from the same source as far as i know but this one has Opus 5.1 and a lot more video quality according to some quality metrics (details on technical section) at the same file size. No filter applied.
Here are some comparison shots of my encode vs [AOmundson's release][aomundson release] vs [Cerberus' release][cerberus release]
Mine vs [AOmundson's release][aomundson release] (Source):
[Screenshot Comparison 1 (Dark Scene)][screenshot 1 mine vs ao]
[Screenshot Comparison 2 (Dark Scene)][screenshot 2 mine vs ao]
[Screenshot Comparison 3 (Bright Scene)][screenshot 3 mine vs ao]
[Screenshot Comparison 4 (Bright/Dark Scene)][screenshot 4 mine vs ao]
Mine vs [Cerberus' release][cerberus release](re-encode):
[Screenshot Comparison 1 (Dark Scene)][screenshot 1 mine vs cer]
[Screenshot Comparison 2 (Dark Scene)][screenshot 2 mine vs cer]
[Screenshot Comparison 3 (Bright Scene)][screenshot 3 mine vs cer]
[Screenshot Comparison 4 (Bright/Dark Scene)][screenshot 4 mine vs cer]
#### **Synopsis**
In the distant future, people build their homes and raise domestic animals in subterranean caverns called "pits". This way of life has persisted for hundreds of years, and yet, the people are still powerless against the earthquakes and cave-ins which occasionally devastate their villages. Jeeha is one such village...
One day, while digging tunnels to expand Jeeha's edges, a boy named Simon happens to find a small, shiny drill. Meanwhile, Kamina — Simon's soon-to-be "bro" — insists that there is another land above the village and tries to break through the ceiling in order to leave the cavern. He fails; however, an earthquake suddenly occurs, the ceiling collapses, and a gigantic robot — a "Ganmen" — crashes to the cave floor!
Kamina is now certain that there is a world above their tiny pit-village. Encouraged, he begins to fight recklessly against the robot, until he encounters another person who has arrived from the land above. She is a beautiful girl by the name of Youko, who has come from a neighboring village with a rifle in hand. She has been hunting the robot, but her shots only seem to irritate it. Desperately trying to escape its attacks, Simon brings Kamina and Youko to what he had previously found: a mysterious robot with a head for a body.
And so begins the "epic" adventure...
Source: [AniDB][anidb link]
**Recommended Players**: VLC Media Player, Media Player Classic (K-Lite Codec Pack)
**File details**
Video:
1920x1080 23.976 fps HEVC x265 10-bit
Audio:
English; Opus Surround ~ 256kbit/s
Japanese; Opus Stereo ~128 kbit/s
Subtitles:
English; ASS subtitles
Signs/Song for Dub; ASS subtitles
#### **Technical Details:** (in case you're interested)
**Audio**:
This part is exactly the same as [this torrent][fullmetal link]. I copy-pasted it.
I encoded the default english surround audio track with Opus 256-Kb/s because the recommended bitrate for surround is 256-Kb/s according to [wiki][opus wiki], i encoded the japanese stereo audio track with Opus 128-Kb/s because it says opus at 128-Kb/s for stereo is nearly indistinguishable from the uncompressed source on [wiki][opus wiki]. I encoded stereo english comment audio tracks with Opus 96-Kb/s for decreasing the file size and it’s the minimum recommended setting for stereo according to [wiki][opus wiki]. In case you are asking why i am using opus: [Opus Comparison][opus compare]
**Video**:
I measured three video quality metrics: [PSNR][psnr link], [SSIM][ssim link] and the newest one [VMAF][vmaf link]. PSNR is the oldest one and i think it has the lowest importance because it's a signal to noise ratio and it has nothing to do with human perception of quality. VMAF i think is the most important one because it's developed with human perception of quality in mind. I don't want to go into details on these.
Let's talk about my video metrics. I measured these quality metrics on first episodes only, [Cerberus'][cerberus release] video and mine given the reference video [AOmundson's][aomundson release].
(**Higher is better**)
|Release|PSNR|SSIM|VMAF|
|:---:|:----:|:---:|:---:|
|**QaS (Mine)**|50.0308|0.9935|97.0272|
|**Cerberus**|49.2725|0.9927|96.3276|
**Comment about results**: As you can see i managed to improve video quality a lot at the almost same file size according to three video quality metrics.
**Personal opinion**: Video quality looks so much better especially on action scenes.
Huge thanks to [Judas][judas link] for guiding me and answering my questions about encoding. [Judas][judas link] is a perfectionist. Some of his re-encodes are much better looking than the source at low file size. You should try [his torrents][judas link].
**Seed as much as possible please.**
[aomundson release]: https://nyaa.si/view/1192406
[cerberus release]: https://nyaa.si/view/1233067
[anidb link]: https://anidb.net/anime/4575
[fullmetal link]: https://nyaa.si/view/1368971
[opus wiki]: https://wiki.xiph.org/Opus_Recommended_Settings
[opus compare]: https://opus-codec.org/comparison/
[judas link]: https://nyaa.si/user/Judas
[psnr link]: https://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio#:~:text=Peak%20signal%2Dto%2Dnoise%20ratio%20(PSNR)%20is%20an,the%20fidelity%20of%20its%20representation.
[ssim link]: https://en.wikipedia.org/wiki/Structural_similarity#:~:text=The%20structural%20similarity%20index%20measure,the%20similarity%20between%20two%20images.
[vmaf link]: https://en.wikipedia.org/wiki/Video_Multimethod_Assessment_Fusion
[screenshot 1 mine vs ao]: https://screenshotcomparison.com/comparison/13017
[screenshot 2 mine vs ao]: https://screenshotcomparison.com/comparison/13018
[screenshot 3 mine vs ao]: https://screenshotcomparison.com/comparison/13019
[screenshot 4 mine vs ao]: https://screenshotcomparison.com/comparison/13020
[screenshot 1 mine vs cer]: https://screenshotcomparison.com/comparison/13021
[screenshot 2 mine vs cer]: https://screenshotcomparison.com/comparison/13022
[screenshot 3 mine vs cer]: https://screenshotcomparison.com/comparison/13023
[screenshot 4 mine vs cer]: https://screenshotcomparison.com/comparison/13024
![[QaS] Tengen Toppa Gurren Lagann [BD 1080p HEVC x265 10bit Opus 5 1][Dual Audio]](https://f.0c.mom/no-cover.webp)
