[BlackRabbit] Dragon Ball Kai (2009) - S02 [Bluray-1080p][Opus 2.0][AV1]

Release Information

Field	Value
File	Dragon Ball Kai (2009) - S02E01 - Seven Years Later! Starting Today Gohan is a High School Student [Bluray-1080p][Opus 2.0][AV1]-BlackRabbit.mkv
Source	ZeBenko
File Size	249 MiB
Duration	23 min 7 s
Overall Bitrate	1 504 kb/s
Frame Rate	23.976 FPS
Rabbit Encoder	v8.3.3
Language Detector	v2.5.3

Rabbit Encoder Settings

Setting	Value
Quality	Low
Speed	Slower
Dedupe subtitles	Yes
Highest audio layout only	Yes
No commentary audio	Yes
Audio languages	jpn, eng
Raw	RE1|c~cp=--film-grain 8,q=l,sp=sr,crp=a,dd=1,kc=1,rc=1|al~v=jpn+eng|sm~sp=f,tb=s,dp=1,cz=1|st~cv=1,ra=1,ru=1

Video

Property	Value
Codec	AV1
Resolution	1920×1080
Aspect Ratio	16:9
Bitrate	1 340 kb/s
Frame Rate	23.976 (24000/1001) FPS (Constant)
Bit Depth	10 bits
Stream Size	222 MiB (89%)

Audio

#	Language	Codec	Channels	Bitrate	Sample Rate	Size	Flags
1	Japanese	Opus	2 channels (L R)	116 kb/s	48.0 kHz	19.2 MiB (8%)	Default

Subtitles

#	Title	Format	Language	Flags
1	Full Subtitles [ZeBenko]	ASS	English	Default

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BlackRabbit Encodes

BlackRabbit focuses on mini encodes made for users who want to save storage space without giving up solid video and audio quality.
Our goal is simple: find the best available remux source, preferably with dual audio (Japanese + English) when possible, and encode it into:

• Video: AV1
• Audio: Opus

This makes the releases especially useful for people running automated setups such as Sonarr, where smaller file sizes can save a lot of storage over time.

Our Encoding Approach

Our releases are more than a straight AV1 + Opus re-encode. We do not re-time dialogue or cut content, but we clean up, optimize, and reorganize the tracks so every release is tidy, consistent, space-efficient, and behaves correctly across devices and media servers.

The core changes are:

• video is encoded to AV1
• audio is encoded to Opus
• black borders caused by an incorrect source resolution are automatically cropped
• unnecessary, duplicate, and lower-priority tracks are removed
• overall file size is significantly smaller

The result preserves the actual anime content while making the release smaller, cleaner, and better organized.

Video Handling

• Automatic cropping — black borders are detected and removed when the source contains unused picture area or an incorrect stored resolution.
• Content preservation — cropping removes only black border area; the actual image content is not cut or re-framed.

Audio Handling

Beyond re-encoding to Opus, we tidy up the audio tracks so they behave predictably:

• Japanese and English only — other audio languages are excluded to reduce file size.
• Smart bitrates — the Opus bitrate is chosen per channel layout (mono, stereo, 5.1, 6.1, 7.1, all the way up to 7.1.4).
• Highest layout only — only the highest available channel layout is kept for each language.
• Commentary removal — all audio commentary tracks are excluded.
• Uncensored preference — when both censored and uncensored audio tracks are available, the uncensored track is preferred.
• Logical ordering — Japanese audio is placed first and English second.
• Best-source selection — when equivalent candidates remain, lossless sources are preferred, followed by the highest-bitrate source.
• Correct flags — default, original, and audio-description flags are set properly.
• Sync correction — any audio delay/offset baked into the source is corrected so tracks stay in sync.
• Clean track names — messy or inconsistent track titles are cleared.

Subtitle Handling

Main dialogue subtitles are normalized for consistent readability while signs, songs, karaoke, and other typesetting remain untouched:

• Consistent dialogue styling — main dialogue uses Noto Sans for modern-looking anime or Noto Serif when an older or more traditional style better matches the show.
• High visibility — dialogue is styled at 80 px with white text, a black outline, and a black shadow.
• SRT conversion — all SRT tracks are converted to ASS and receive the same dialogue style.
• Typesetting preservation — only the main dialogue style is replaced; signs, songs, karaoke, on-screen text, and other custom styles are preserved.
• Unused font cleanup — font attachments that are no longer referenced by any retained subtitle track are removed from the MKV container.
• Track classification — every track is identified as Full, Signs & Songs, SDH, Honorifics, Commentary, or Storyboards, including content-based detection for sources with wrong or missing labels.
• Fansub priority — fansub subtitle tracks are preferred over original or official tracks when both are available.
• Uncensored preference — when both censored and uncensored subtitle tracks are available, the uncensored track is preferred.
• Text over image — picture-based subtitles such as PGS are excluded when a text-based subtitle track is available for the same language.
• Conditional zlib compression — subtitle tracks are compressed only when zlib reduces their size by at least 10%; otherwise they remain uncompressed.
• Clean, consistent names — e.g. Full Subtitles, Signs & Songs, and SDH, with the source or release group tagged where known.
• Correct flags — default, forced, hearing-impaired, commentary, and original flags are set so players automatically pick the intended track.
• Logical ordering — English first, Japanese second, and other languages alphabetically after that; full subtitles before signs & songs; text-based before image-based.
• Deduplication — redundant subtitle tracks are removed.

Source Quality

Source quality is very important to us. If a better remux/source becomes available later, we may re-encode the entire season using that source and increase the version number.
If you know of a better source, please let us know in the comments.

Sonarr Compatibility

Compatibility with automated media systems, especially Sonarr, is one of our main priorities. Because of that, we try to keep file names as Sonarr-compatible as possible to make library management easier and more reliable.

Our Priority

Our main goal is to provide mini AV1 encodes for as many anime as possible while still maintaining good video and audio quality.
When strong AV1 releases from other groups are already available, we would generally recommend using those instead. BlackRabbit's focus is on helping fill the gaps by providing compact, high-quality AV1 encodes across a wide range of titles.

Optional Support

If you would like to support and help us continue releasing mini AV1 encodes, donations are appreciated but never expected.

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Feedback is always welcome. If you spot a better source, naming issue, or anything else worth improving, let us know in the comments.