Re: [rtcweb] H261/MPEG-1 video quality

Adam Roach <adam@nostrum.com> Fri, 15 November 2013 22:23 UTC

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Date: Fri, 15 Nov 2013 16:23:38 -0600
From: Adam Roach <adam@nostrum.com>
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To: cowwoc <cowwoc@bbs.darktech.org>, rtcweb@ietf.org
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Subject: Re: [rtcweb] H261/MPEG-1 video quality
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On 11/15/13 09:37, cowwoc wrote:
> On 15/11/2013 9:22 AM, Harald Alvestrand wrote:
>> On 11/15/2013 02:47 PM, cowwoc wrote:
>>> Magnus,
>>>
>>> Couldn't we alter the option with H.261 to state that we're 
>>> proposing an IPR-expired codec *like* H.261? I don't think we need 
>>> to decide at this moment which precise codec that would be.
>>
>> If the proposal isn't for a concrete codec, it's impossible to evaluate.
>>
>> Please - if you want this option to be on the table, make it a real 
>> option, not a "someone else should do the work necessary to figure 
>> out if it's a real option".
>
> Agreed. I'll reply to Magnus's thread.

Honestly, there aren't really a lot of contenders here. There's really 
not much that predates H.261 (H.120 did, but it is *actually* unusable, 
as opposed to merely whine-worthy). Here's a realistic list of codecs to 
think about, with H.120 added just as an historical backstop to indicate 
"digital video didn't realistically exist before this point in time":

Codec           | Date | Quality (comparable to)
----------------+------+---------------------------
VP8             | 2008 | Broadcast HDTV
H.264           | 2003 | Broadcast HDTV
Theora/VP3/VP4  | 2000 | DivX-encoded movies
H.263           | 1995 | RealVideo circa 2000
H.262/MPEG2     | 1995 | DVDs
MPEG1           | 1993 | CD Videodisc
H.261           | 1988 | Early "videophones"
H.120           | 1984 | Belt-sanding your eyeballs
----------------+------+---------------------------

/a