Re: [rtcweb] Video codec selection: Dropping options

[cowwoc <[e-mail]>]

On 28/11/2013 5:20 AM, Leon Geyser wrote:
> I am a bit confused about option 15. How does that one work?
> Let's say I have a two sides: H.264 encoding/decoding + Theora decoder 
> and the other side has VP8 encoding/decoding + Theora decoder. How do 
> they communicate?

Any option that mandates one or more decoders implies "and MUST support 
encoding of one of the aforementioned formats".

Gili

>
>
> On 28 November 2013 10:22, <[e-mail] 
> <mailto:[e-mail]>> wrote:
>
>     Hi,
>
>     I'm not much in favor of the voting, but if we do it:
>
>     Based on the consensus call we already held in Vancouver, I would
>     propose to drop from the list in [1] any options that make
>     exclusively VP8 mandatory to implement or exclusively H.264
>     mandatory to implement. I think we have already established that
>     much, and including those options in any vote seems wrong.
>
>     In practice I'm talking about these four options:
>     1. All entities MUST support H.264
>     2. All entities MUST support VP8
>     3. All entities MUST support both H.264 and VP8
>     4. Browsers MUST support both H.264 and VP8, other entities MUST
>     support at least one of H.264 and VP8
>
>     What the WG should focus on is to see if there is a consensus on
>     any of the so called "fallback" options vs. no MTI. I think these
>     are all valid as such as a "fallback":
>
>     5. All entities MUST support at least one of H.264 and VP8
>     6. All entities MUST support H.261
>     7. There is no MTI video codec
>     8. 5+6, i.e. All entities MUST support H.261 and all entities MUST
>     support at least one of H.264 and VP8
>     9. All entities MUST support Theora
>     10. All entities MUST implement at least two of {VP8, H.264, H.261}
>     11. All entities MUST implement at least two of {VP8, H.264, H.263}
>     12. All entities MUST support decoding using both H.264 and VP8,
>     and MUST support encoding using at least one of H.264 or VP8
>     13. All entities MUST support H.263
>     14. All entities MUST implement at least two of {VP8, H.264 CBP,
>     Theora}
>     15. All entities MUST support decoding using Theora.
>
>     I think it would be problematic even if one of options 1-4 came
>     out as a winner from a voting procedure, since it would force a
>     large part of the community to implement something they have valid
>     reasons to avoid. Some of the options 5-15 may have issues as
>     well, but at least a consensus call among them would still be in
>     order, since we haven't really had it so far. And presumably the
>     issues and polarization are "smaller" than with the VP8 vs. H.264
>     argument.
>
>     Regards,
>             Markus
>
>     [1] http://trac.tools.ietf.org/wg/rtcweb/trac/wiki/WikiStart
>
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