[theora-dev] DC prediction
jonathan.fabrizio at lrde.epita.fr
Fri Mar 25 06:56:44 PDT 2011
Le 25/03/2011 13:52, Benjamin M. Schwartz a écrit :
> On 03/25/2011 07:38 AM, Jonathan Fabrizio wrote:
>> * Truncate DC to a 16-bit representation by dropping any higher-order bits.
>> But why dropping higher-order bits ?
> 1. In practice, this overflow does not occur. A non-buggy encoder is very
> unlikely to produce streams that overflow because this would result in bad
> 2. Checking for overflow (which occurs not at all or very rarely) would
> waste CPU time, because most processors do not have fast saturating
> 3. Theora is designed to be backwards-compatible with On2 VP3, so the core
> decoding algorithms could not be changed.
thank you for your response
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