ive been testing out audio bitrates and codecs and found opus to be the best at this bitrate my ears cant tell the difference when compered to 320kbps mp3/aac
i just have 1 problem when i rip a cd to opus meda info in media player classic shows the khz as 44.1khz same as what the original cd is but vlc player and the app on my phone both say the audio is 48khz
so im confused is media info wrong or has it really converted the 44.1khz to 48khz and will there be any problems so far the 2 cds i ripped sound fine without problemsGeneral
Complete name : G:\All Time Low\Nothing Personal\04 All Time Low - Lost In Stereo.opus
Format : Ogg
File size : 3.98 MiB
Duration : 3 min 47 s
Overall bit rate : 133 kb/s
Album : Nothing Personal
Album/Performer : All Time Low
Part : 1
Part/Total : 1
Track name : Lost In Stereo
Track name/Position : 4
Track name/Total : 12
Performer : All Time Low
Label : Hopeless Records
Genre : Pop / Rock
Recorded date : 2009
Writing application : Opus 1.3.1
ISRC : USHR20947004
ENCODER_OPTIONS : --bitrate 120
Style : Pop Rock / Power Pop / Punk / Pop Punk
Catalog # : 710
Source : CD (Lossless)
Encoded By : dBpoweramp Release 17.4
Encoder Settings : -bitrate="120"
AccurateRipResult : AccurateRip: Accurate (confidence 2) [3D071E1E]
AccurateRipDiscID : 012-00120512-00a952af-8f099f0c-4
ID : 1888 (0x760)
Format : Opus
Duration : 3 min 47 s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Compression mode : Lossy
Writing library : libopus 1.3-26-ge85ed772, libopusenc 0.2.1-2-g9cb17c6
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It says sampling rate 44.1 in the report above
Assuming you did NOT do any SRC (sample rate conversion), ALL CD rips would be 44.1kHz, and so would any compressed version from them. So, I must deduce that those other apps are wrong.
MediaInfo does not do any SRC, it just shows you what the metadata is in the file. Would love to see some of these other apps that are reporting otherwise.
Opus allows the following bandwidths during encoding. Opus compression does not depend on the input sample rate; timestamps are measured in 48 kHz units even if the full bandwidth is not used. Likewise, the output sample rate may be freely chosen. For example, audio can be input at 16 kHz yet be set to encode only narrowband audio.
Abbreviation Audio bandwidth Effective sample rate NB (narrowband) 4 kHz 8 kHz MB (medium-band) 6 kHz 12 kHz WB (wideband) 8 kHz 16 kHz SWB (super-wideband) 12 kHz 24 kHz FB (fullband) 20 kHz 48 kHz
Last edited by El Heggunte; 27th Oct 2021 at 20:40."Like this facility, I don't exist."
This was news to me.
Reading those docs, it appears Opus applies SRC both on encode and (usually) on decode, And there are also built in lags for that src as well as for packet resiliency, and a few other codec-switching-trick functions.
This may be cool for some of those features, but the audiophile in me says F**k No! I have so far rarely used the codec family, mainly because I have few hardware devices that support it, but it seriously gives me pause about using it again. I don't want any app applying SRC that isn't fully under my control.