Codec Developers

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Please use av1-discuss for questions related to the AV1 video codec

https://groups.google.com/a/aomedia.org/forum/#!forum/av1-discuss

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Christian Feldmann, James Zern2

Mar 27

Forced keyframes in 2 pass may not be coded as keyframes

On Mon, Mar 27, 2023 at 4:43 AM 'Christian Feldmann' via Codec Developers <codec-devel@

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Forced keyframes in 2 pass may not be coded as keyframes

On Mon, Mar 27, 2023 at 4:43 AM 'Christian Feldmann' via Codec Developers <codec-devel@

Mar 27

Feb 9

libvpx v1.13.0 Ugly Duckling Finalized

Hello everyone, libvpx v1.13.0 Ugly Duckling is finalized. Here's the release note. Thanks.

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libvpx v1.13.0 Ugly Duckling Finalized

Hello everyone, libvpx v1.13.0 Ugly Duckling is finalized. Here's the release note. Thanks.

Feb 9

FX Coudert, James Zern3

10/24/22

libvpx 1.12.0 does not compile on macOS Ventura (macOS 13)

On Mon, Oct 24, 2022 at 3:55 PM James Zern <jz...@google.com> wrote: On Mon, Oct 24, 2022 at 12

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libvpx 1.12.0 does not compile on macOS Ventura (macOS 13)

On Mon, Oct 24, 2022 at 3:55 PM James Zern <jz...@google.com> wrote: On Mon, Oct 24, 2022 at 12

10/24/22

9/7/22

How to refreshing specific spatial layer only?

Jerome Jiang's 'VP9 Features & Optimizations for Real-Time Video' presentation [1]

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How to refreshing specific spatial layer only?

Jerome Jiang's 'VP9 Features & Optimizations for Real-Time Video' presentation [1]

9/7/22

6/28/22

libvpx v1.12.0 Torrent Duck Finalized

Hello everyone, libvpx v1.12.0 Torrent Duck is finalized. Here is the release note. Thanks. Release

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libvpx v1.12.0 Torrent Duck Finalized

Hello everyone, libvpx v1.12.0 Torrent Duck is finalized. Here is the release note. Thanks. Release

6/28/22

Jeff Mears, James Zern3

2/25/22

Thoughts about assembly language

On Fri, Feb 25, 2022 at 1:30 PM James Zern <jz...@google.com> wrote: Hi Jeff, On Fri, Feb 25,

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Thoughts about assembly language

On Fri, Feb 25, 2022 at 1:30 PM James Zern <jz...@google.com> wrote: Hi Jeff, On Fri, Feb 25,

2/25/22

11/5/21

Comments on text of VP9 Bitstream & Decoding Process Specification v0.6

Reading the VP9 spec went smoothly for the most part, however I had some comments: 3 Symbols (and

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Comments on text of VP9 Bitstream & Decoding Process Specification v0.6

Reading the VP9 spec went smoothly for the most part, however I had some comments: 3 Symbols (and

11/5/21

10/7/21

libvpx v1.11.0 Smew Duck Finalized

Hello everyone, libvpx v1.11.0 Smew Duck is finalized. Here is the release note. Thanks. Release Note

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libvpx v1.11.0 Smew Duck Finalized

Hello everyone, libvpx v1.11.0 Smew Duck is finalized. Here is the release note. Thanks. Release Note

10/7/21

3/24/21

libvpx v1.10.0 Ruddy Duck Finalized

Correction: It should be "libaom libvpx v1.10.0 Ruddy Duck is finalized." Thanks! On Wed,

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libvpx v1.10.0 Ruddy Duck Finalized

Correction: It should be "libaom libvpx v1.10.0 Ruddy Duck is finalized." Thanks! On Wed,

3/24/21

3/23/21

libaom v3.0.0 Braeburn Finalized

Correction: The table of section of "AV1 Encoder Speed Improvement" in the release note

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libaom v3.0.0 Braeburn Finalized

Correction: The table of section of "AV1 Encoder Speed Improvement" in the release note

3/23/21

3/18/21

Next generation of SIF Codec is available

SIF Video Codec project was started about 20 years ago as a pure new video compression approach based

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Next generation of SIF Codec is available

SIF Video Codec project was started about 20 years ago as a pure new video compression approach based

3/18/21

Victor CHEN, James Zern2

2/10/21

Motion-Constrained Tile support in VP9

Hi, On Sat, Feb 6, 2021 at 12:54 AM Victor CHEN <yongti...@ucdconnect.ie> wrote: Hi there,

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Motion-Constrained Tile support in VP9

Hi, On Sat, Feb 6, 2021 at 12:54 AM Victor CHEN <yongti...@ucdconnect.ie> wrote: Hi there,

2/10/21

12/25/20

Howcan I force a GOP structure in VP9 encoder?

Hello, Thank you for your answer. Could explain to me how prediction for the frame 3 is performed in

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Howcan I force a GOP structure in VP9 encoder?

Hello, Thank you for your answer. Could explain to me how prediction for the frame 3 is performed in

12/25/20

7/30/20

libvpx v1.9.0 Quacking Duck Released

Hello everyone, libvpx v1.9.0 Quacking Duck[1] has been released. What's new: This release adds

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libvpx v1.9.0 Quacking Duck Released

Hello everyone, libvpx v1.9.0 Quacking Duck[1] has been released. What's new: This release adds

7/30/20

7/20/20

libvpx v1.9.0-rc1

Hello everyone, Libvpx v1.9.0-rc1 is tagged[1]. Please help test and file bugs here[2]. Thanks. [1]

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libvpx v1.9.0-rc1

Hello everyone, Libvpx v1.9.0-rc1 is tagged[1]. Please help test and file bugs here[2]. Thanks. [1]

7/20/20

(Daniel.L) Byoungchan Lee, James Zern2

7/7/20

Why external Frame Buffer is not supported in VP8 ?

On Mon, Jul 6, 2020 at 9:07 PM (Daniel.L) Byoungchan Lee <dani...@hpcnt.com> wrote: > >

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Why external Frame Buffer is not supported in VP8 ?

On Mon, Jul 6, 2020 at 9:07 PM (Daniel.L) Byoungchan Lee <dani...@hpcnt.com> wrote: > >

7/7/20

Jerome Jiang, Jai Krishnan2

5/21/20

libaom v2.0.0 Applejack

Some additional information from the libaom 2.0.0 release, covering: Improvements to compression

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libaom v2.0.0 Applejack

Some additional information from the libaom 2.0.0 release, covering: Improvements to compression

5/21/20

5/8/20

Please help test libaom v2.0.0-rc1

and file issue here if you find any problems. ---------- Forwarded message --------- From: jianj via

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Please help test libaom v2.0.0-rc1

and file issue here if you find any problems. ---------- Forwarded message --------- From: jianj via

5/8/20

phantom....@gmail.com

3/13/20

2 pass CRF: much higher bitrate if auto-alt-ref enabled

ffmpeg -i "tos.y4m" -c:v libvpx-vp9 -quality good -cpu-used 2 -g 500 -auto-alt-ref 1 -tile-

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2 pass CRF: much higher bitrate if auto-alt-ref enabled

ffmpeg -i "tos.y4m" -c:v libvpx-vp9 -quality good -cpu-used 2 -g 500 -auto-alt-ref 1 -tile-

3/13/20

12/20/19

libvpx for maccatalyst

anyone can help compiling vp8 codec for maccatalyst target?

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libvpx for maccatalyst

anyone can help compiling vp8 codec for maccatalyst target?

12/20/19

12/19/19

Pekin Duck Release (v1.8.2)

The Pekin Duck release has been finalized. There have been no changes since the release candidate was

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Pekin Duck Release (v1.8.2)

The Pekin Duck release has been finalized. There have been no changes since the release candidate was

12/19/19

12/9/19

Pekin Duck Release Candidate

The Pekin duck was bred from a Chinese variety called 'shi-chin-ya-tze'. There is a

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Pekin Duck Release Candidate

The Pekin duck was bred from a Chinese variety called 'shi-chin-ya-tze'. There is a

12/9/19

peichuan zhang, James Zern4

11/21/19

vp9 level idx syntax

On Wed, Nov 20, 2019 at 6:17 PM peichuan zhang <peichuan...@gmail.com> wrote: > >

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vp9 level idx syntax

On Wed, Nov 20, 2019 at 6:17 PM peichuan zhang <peichuan...@gmail.com> wrote: > >

11/21/19

여현호, chiy...@google.com3

10/29/19

Could I turn-off compound predictions for encoding a vp9 video?

Thank you. I'll look at that code first. It really helps me a lot. - Hyunho 2019년 10월 30일 수요일 오전

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Could I turn-off compound predictions for encoding a vp9 video?

Thank you. I'll look at that code first. It really helps me a lot. - Hyunho 2019년 10월 30일 수요일 오전

10/29/19

Alessandro Petrini, … l...@3cx.com10

10/1/19

Contribution proposal for GPU-accelerated VP8 encoder

Can't wait to try this out. On Wednesday, May 18, 2016 at 5:58:14 PM UTC+3, Alessandro Petrini

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Contribution proposal for GPU-accelerated VP8 encoder

Can't wait to try this out. On Wednesday, May 18, 2016 at 5:58:14 PM UTC+3, Alessandro Petrini

10/1/19

Egor Yusov, James Zern4

8/27/19

Building libvpx on Windows

On Fri, Aug 23, 2019 at 3:51 PM 'Egor Yusov' via Codec Developers <codec-devel@webmproject

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Building libvpx on Windows

On Fri, Aug 23, 2019 at 3:51 PM 'Egor Yusov' via Codec Developers <codec-devel@webmproject

8/27/19

yeju...@intel.com, … James Zern18

8/6/19

VP9 ROI support

Hi, I tried libvpx-vp9 roi in ffmpeg and found that ROI feature is only enabled with conditions: 1).

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VP9 ROI support

Hi, I tried libvpx-vp9 roi in ffmpeg and found that ROI feature is only enabled with conditions: 1).

8/6/19

7/16/19

Orpington Duck Release (v1.8.1)

The Orpington Duck release has been finalized. Since the initial release candidate changes have been

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Orpington Duck Release (v1.8.1)

The Orpington Duck release has been finalized. Since the initial release candidate changes have been

7/16/19

phantom....@gmail.com

6/28/19

how VP9 CRF mode works?

Please, explain how VP9 CRF mode works? According to manual https://developers.google.com/media/vp9/

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how VP9 CRF mode works?

Please, explain how VP9 CRF mode works? According to manual https://developers.google.com/media/vp9/

6/28/19

6/27/19

Orpington Duck Release Candidate

The Orpington Duck is a hybrid composed of ducks from previous libvpx releases: Aylesbury (v0.9.5),

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Orpington Duck Release Candidate

The Orpington Duck is a hybrid composed of ducks from previous libvpx releases: Aylesbury (v0.9.5),

6/27/19

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