[Vorbis-dev] Multi-channel with empty channels.

[xiphmont at xiph.org]

On Mon, Jul 13, 2009 at 2:33 AM, Oliver
Thuns<oli+243897 at ml0815.streaps.org> wrote:
> On Mon, Jul 13, 2009 at 3:54 AM, e deleflie<edeleflie at gmail.com> wrote:
>> All,
>>
>> Lets say I have a 16 channel file, but 10 of those channels are empty
>> (all values are 0).
>>
>> For a) the vorbis codec and also b) the FLAC codec ... would the size
>> of the file be close to (or practically the same as) the size of a 6
>> channel file?
>
> yes, if it's digital silence, the encode is very close to the 6
> channel file in size. Though I don't know how big the differences in
> CPU cycles is (if the Vorbis codec is more efficient on digital
> silence than it is on average content).

true digital silence will be marked as zero energy in the bitstream
and no cpu time will be spent on decoding silence.

Monty