I wonder how long it'll take to get a binary?
Thank you! Is there a list somewhere which details the fixed bugs, or my only source for this is the commit log right now?
surround with good quality at 128 kbps for 5.1 and usable down to 48 kbps, and
(...) These improvements are explained in more details in Monty's demo (updated from the 1.1 beta demo).Of course, this new version is still fully compliant with the Opus specification (RFC 6716).
Surround masking takes advantage of cross-channel masking between free-field loudspeakers. Obviously, we can't do that for stereo, as stereo is often listened to on headphones or nearfield monitors, but for surround encodings played on typical surround placements with listeners placed well within the soundfield, there's considerable savings to be had by assuming freefield masking.
I'm curious if there's upcoming directshow filter for opus,
Looks like rockbox+opus now manages to squeeze out 30 minutes more of runtime on my clip+ (10:04:40 -> 10:38:05 @160kbps). That's great, but still way behind FLAC (16:09:49@lv8) or MPC (16:13:47@192kbps). Logs for comparison here
Documentation (opusenc.html) claims that Opus supports bitrates neginning from 6 kbps per channel. But actually for bitrates <30 it performs downmixing to mono. At 30 kbps we have something (but very sick) on the side channel, and starting from 32 kbps we really have a stereo effect, but stereo pan is much narrower than original.
On other side FhG AAC's parametric stereo handles stereo at low bitrates very well. So which stereo encoding technology is used by the Opus? Looks like a simple Mid/Side encoding (but maybe separate for each frequency band, like in AAC).
P.S. Starting from about 40 kbps I get almost independent stereo encoding (I mean very low stereo crosstalk). However, I wonder what's this transition interval between 30 and 40 kbps.
Not all applications need stereo. At 6 kb/s, which is low bitrate even by VoIP standards, what you can have is narrowband mono.
Quote from: jmvalin on 08 December, 2013, 02:27:07 AMNot all applications need stereo. At 6 kb/s, which is low bitrate even by VoIP standards, what you can have is narrowband mono.Sure, but in fact that statement is incorrect and minimum 16 kbps per channel is needed to get stereo effects. Maybe you should make some corrections to the manual.