[vorbis] APPLAUD.WAV problems
greg at wooledge.org
Sun Feb 17 15:31:48 PST 2002
Ed Sweetman (ed.sweetman at wmich.edu) wrote:
> can you explain why there are no low bitrates for audio sections that
> require very little information to be encoded to have the quality that
> is designated.
Because the sections that you're encoding are not as simple as you
think they are. A very quiet but non-zero signal is just as hard to
encode as a really loud signal. Those 6 seconds of "silence" before a
song starts up are full of background noise from the recording studio,
not digital silence.
Digital silence looks something like this:
$ dd if=/dev/zero bs=1024 count=512 | oggenc -r -o silence.ogg -
Encoding standard input to
"silence.ogg" at quality 3.00
Encoding with VBR
Encoding [ 0m03s so far] \512+0 records in
512+0 records out
<p>Done encoding file "silence.ogg"
File length: 0m 02.0s
Elapsed time: 0m 04.0s
Average bitrate: 7.9 kb/s
$ ls -l silence.ogg
-rw-rw-r-- 1 greg greg 2949 Feb 17 18:27 silence.ogg
Greg Wooledge | "Truth belongs to everybody."
greg at wooledge.org | - The Red Hot Chili Peppers
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 241 bytes
Desc: not available
Url : http://lists.xiph.org/pipermail/vorbis/attachments/20020217/34d2f712/part-0001.pgp
More information about the Vorbis