Re: [Cellar] FFV1 Version 4

[Dave Rice <[e-mail]>]

> On Jan 5, 2016, at 9:22 AM, Kieran O Leary <[e-mail]> wrote:
> 
> Hello,
> 
> I saw on your charter that a milestone for September 2016 is "Submit specification for FFV1 video codec version 4 to IESG (Standards Track)". https://datatracker.ietf.org/wg/cellar/charter/ <https://datatracker.ietf.org/wg/cellar/charter/>
> 
> Is there any information or roadmap available about proposed changes from version 3 to version 4? I'm asking as the added features of Version 3 were significant for moving image archives, and I'm curious to know what version 4 may look like.

This is the place to provide proposals. There has been a little discussion on FFmpeg-devel but none yet on CELLAR. IMO I'd like to consider the following for FFV1:

Increased Self-Description of Intended Decoding
- documentation of color matrix (i.e. bt.601, bt.709, etc)
- documentation of sample range (i.e. full range vs broadcast range)

Increased Self-Description of the Encoding
- storage of encoding parameters (I see this features in h264, are these called SEI messages?)

Extending Pixel Format Support
- support for Bayer pixel formats

Some Header Adjustments
- currently some values such as bit depth, display aspect ratio, and chroma subsampling are set per slice rather than per frame. Perhaps there is a reason I am not considering, but possibly some adjustment could improve the logic of the frame and slice headers.

Looking forward to discussion on this topic.

Best Regards,
Dave Rice