Logo Logo
directory schraeg
Camcorders· Cinema-Kamera· Computers· Drohnen· GPU· Kamera-Zubehör· Video-DSLR· accessories
Compositing· Color correction· DV Editing

Shooting· Sound
Forschung· KI· Reviews· Streaming
/// News
Netflix removes movie noise, saves 30% bandwidth and adds it back again

Netflix removes movie noise, saves 30% bandwidth and adds it back again

[10:00 Thu,21.July 2022   by ]    

Filmmaker Parker Gibbons has drawn attention to a very interesting fact: Netflix removes film noise before streaming its movies and artificially adds it back when decoding. This is because digitally shot films are actually free of any film grain, the very specific (not to be confused with noise caused by too little light) noise that occurs in analog filming. But this type of noise has become so associated with "real" motion pictures through the long history of film (as a component of the film look) that it is unconsciously perceived by many viewers as an important feature of a motion picture.

Examples of film grain.

Synthetic film noise

This is why film grain is often artificially added to digital films that are actually devoid of film noise, in order to make a film more cinematic. There are even special tools for this purpose (such as Dehancer Pro) that allow filmmakers to precisely control the appearance of the desired artificial film grain.

Film grain is the smallest structures of the developed film made of small particles of metallic silver, which only become clearly visible under high magnification. Its pattern and intensity depends very much on the type of film, but also on the developing conditions.

Pure film grain

Noise as a problem in compression

For film compression, however, film grain (like any image noise) is an obstacle to streaming images as efficiently as possible because it occurs chaotically and so cannot be easily compressed (unlike, say, large areas or objects with recurring structures). And poorly compressed film noise no longer looks like film grain, but results in visible image artifacts. For large streaming services like Netflix, however, efficient compression is worth money - the less data that has to be delivered to the viewer for a movie, the less it costs in bandwidth (especially, of course, with billions of video streams).

AV1 Film Grain Synthesis

This leads to a difficult-to-resolve contradiction between, on the one hand, film material that is as compressible and noise-free as possible, and, on the other hand, the noise caused by film grain that is desirable for the film look. Netflix has found a very special solution to resolve this contradiction. It uses a very special function of the open source AV1 video codec, which Netflix has been using for a long time, namely the artificial synthesis of film grain. Thus, film noise is first analyzed using statistical methods before compression and then removed for efficient compression. According to Netflix, this saves around 30% of the data during transmission.

During decoding, the grain is then re-synthesized from the specific parameters determined in the encoder that characterize the noise and added to the viewer&s device. While the H.264 and H.265 standards also define film grain synthesis, only AV1 mandates this feature, and thus it is reliably supported by any player/decoder.

Netflix encoding examples with and without subsequent film grain synthesis

Here is a clip in which two Netflix video compression specialists Andrey Norkin and Liwei Guo explain the use of AV1 at Netflix (and also discuss the special handling of film grain starting at 05:00):

Since film noise is only artificially added to movies anyway, in the future film noise could theoretically be added to streamed movies right away only in the form of special metadata. This way, they could be compressed and transmitted in maximum quality and viewers could then decide for themselves whether (and how much) film noise they want to watch - or, for example, within the framework of Filmmaker Mode, watch a film entirely as the director intended.

Link more infos at bei twitter.com

deutsche Version dieser Seite: Netflix entfernt Bildrauschen, spart 30% Bandbreite - und fügt es wieder hinzu


  Vorige News lesen Nächste News lesen 
bildLumaFusion v3.1 Update - mobile Editing-App jetzt mit Histogramm, Vektorskop uä. bildBlackmagic ATEM SDI: Neue professionelle Live-Produktionsmischer mit SDI

related news:1E0Writers strike in Hollywood will end after almost 5 months 27.September 2023
Video clip: The new Atomos monitor/recorder line-up explained: new features, applications and more, 22.September 2023
Video clip: Canon RF Cine fixed focal length explained 20.September 2023
Video clip - Adobe Premiere Pro explained: Automatically remove pauses and filler words with AI, etc. 19.September 2023
Video Clip: SmallRigs new VB99 Pro Battery, ultra-compact 60W LED and Smartphone Cage 18.September 2023
Will the iPhone Ultra 16 film spatial video for Apple's Vision Pro headset? 5.September 2023
Breaking Bad 2 - The Official Trailer 28.August 2023
alle Newsmeldungen zum Thema Film
1E0YouTube: new editing app available - and video AI tools coming soon 22.September 2023
Youtube Tip - PRO Colorist Hacks You NEED to Know 13.August 2023
YouTube integrates automatic audio dubbing through AI 31.July 2023
Netflix - better keying with magenta green screen? 12.July 2023
Three green screen lighting setups for a Netflix trailer production explained 18.June 2023
Canon EOS R5 C gets coveted approval for Netflix productions 4.April 2023
Oscar 2023 - German Netflix production wins 4 awards, incl. Best Cinematography 13.March 2023
alle Newsmeldungen zum Thema Streaming Portale
1E0Sony Future Filmmaker Awards 2024 now open for submissions. 28.June 2023
Sony Future Filmmaker Awards winners announced 23.February 2023
Future Filmmaker Awards 2023: Shortlist is final and here are the trailers ... 28.January 2023
Sony Future Filmmaker competition entices with visit to Sony Pictures film studios in Hollywood 1.August 2022
Filmmaker Mode for TVs takes ambient light into account in the future 10.January 2022
Fantastic Fungi by time lapse Behind the Scenes 5.September 2021
Deep yes, fake no? Documentary filmmaker uses AI generated quotes 18.July 2021
alle Newsmeldungen zum Thema Filmmakers

[nach oben]

Archiv Newsmeldungen


October - September - August - July - June - May - April - March - February - January

December - November - October - September - August - July - June - May - April - March - February - January























deutsche Version dieser Seite: Netflix entfernt Bildrauschen, spart 30% Bandbreite - und fügt es wieder hinzu

last update : 1.Oktober 2023 - 18:02 - slashCAM is a project by channelunit GmbH- mail : slashcam@--antispam:7465--slashcam.de - deutsche Version