search for: preskip

...tions. opus-tools version 0.1.7 [root at studio-connect.de audio]# opusenc music_orig.wav music_orig.opus Encoding using libopus 1.0.3 (audio) ----------------------------------------------------- Input: 48kHz 2 channels Output: 2 channels (2 coupled) 20ms packets, 96kbit/sec VBR Preskip: 312 Encoding complete ----------------------------------------------------- Encoded: 1 minute and 30.82 seconds Runtime: 1 minute and 8 seconds (1.336x realtime) Wrote: 1106810 bytes, 4541...

...managed this at a respectable pace for complexity 10: Skipping chunk of type "LIST", length 76 Encoding using libopus 0.9.14 (audio) ----------------------------------------------------- Input: 44.1kHz 1 channel Output: 1 channel (1 uncoupled) 20ms packets, 6kbit/sec VBR Preskip: 356 Encoding complete ----------------------------------------------------- Encoded: 2 minutes and 0.02 seconds Runtime: 50.9 seconds (2.358x realtime) Wrote: 111194 bytes, 6001 packets, 123 pages Bitrate: 6.78414kbit/s (without overhead) Rate range: 2.8kbit/s to 1...

On 13-08-14 10:09 PM, Bob Estes wrote: > I've been studying the Opus code and documentation for a while and have > seen it mentioned several times that Opus uses pre-skip to allow the > codec to converge. What convergence are they referring to? Rate > control? Energy envelope prediction after seeking? Not rate control, but there are a number of predictors running in the

...ping chunk of type "LIST", length 76 > > Encoding using libopus 0.9.14 (audio) > > ----------------------------------------------------- > > Input: 44.1kHz 1 channel > > Output: 1 channel (1 uncoupled) > > 20ms packets, 6kbit/sec VBR > > Preskip: 356 > > > > Encoding complete > > ----------------------------------------------------- > > Encoded: 2 minutes and 0.02 seconds > > Runtime: 50.9 seconds > > (2.358x realtime) > > Wrote: 111194 bytes, 6001 packets, 123 pages >...

...this at a respectable pace for complexity 10: Skipping chunk of type "LIST", length 76 Encoding using libopus 0.9.14 (audio) ----------------------------------------------------- Input: 44.1kHz 1 channel Output: 1 channel (1 uncoupled) 20ms packets, 6kbit/sec VBR Preskip: 356 Encoding complete ----------------------------------------------------- Encoded: 2 minutes and 0.02 seconds Runtime: 50.9 seconds (2.358x realtime) Wrote: 111194 bytes, 6001 packets, 123 pages Bitrate: 6.78414kbit/s (without...

Hi, I've been studying the Opus code and documentation for a while and have seen it mentioned several times that Opus uses pre-skip to allow the codec to converge. What convergence are they referring to? Rate control? Energy envelope prediction after seeking? Is there a discussion of this somewhere? Also, I'm also interested in the seeking behaviour of the decoder. If, say, I want to

Yes, that's a start. Ultimately, though, I'm hoping to reduce the 80ms requirement, and am trying to get a handle on what state in the decoder must converge and what complications I might be up against. I'm also only considering CELT-based encodings if that simplifies things. I know that Opus can do inter-frame energy envelope prediction, but that dependency can be eliminated by

...ting it to OPUS_AUTO, but I'm getting difference results: >opusenc --comp 4 sample.wav sample.opus Encoding using libopus 1.3-rc2 (audio) ----------------------------------------------------- Input: 8 kHz, 1 channel Output: 1 channel (1 uncoupled) 20ms packets, 25 kbit/s VBR Preskip: 312 Encoding complete ----------------------------------------------------- Encoded: 2 minutes and 34.94 seconds Runtime: 1 second (154.9x realtime) Wrote: 588189 bytes, 7747 packets, 157 pages Bitrate: 29.7104 kbit/s (without overhead) Instant rates...

...gt;> >> Encoding using libopus 0.9.14 (audio) >> >> ----------------------------------------------------- >> >> Input: 44.1kHz 1 channel >> >> Output: 1 channel (1 uncoupled) >> >> 20ms packets, 6kbit/sec VBR >> >> Preskip: 356 >> >> >> >> Encoding complete >> >> ----------------------------------------------------- >> >> Encoded: 2 minutes and 0.02 seconds >> >> Runtime: 50.9 seconds >> >> (2.358x realtime) >> >>...

...time opusenc /ahoy/sounds/whistle.wav whistle.opus Skipping chunk of type "LIST", length 46 Encoding using libopus 1.1-fixed (audio) ----------------------------------------------------- Input: 44.1kHz 2 channels Output: 2 channels (2 coupled) 20ms packets, 96kbit/sec VBR Preskip: 356 Encoding complete ----------------------------------------------------- Encoded: 0.74 seconds Runtime: 25 seconds (0.0296x realtime) Wrote: 10983 bytes, 37 packets, 3 pages...

...> [root at studio-connect.de audio]# opusenc music_orig.wav music_orig.opus > Encoding using libopus 1.0.3 (audio) > ----------------------------------------------------- > Input: 48kHz 2 channels > Output: 2 channels (2 coupled) > 20ms packets, 96kbit/sec VBR > Preskip: 312 > > Encoding > complete > ----------------------------------------------------- > Encoded: 1 minute and 30.82 seconds > Runtime: 1 minute and 8 seconds > (1.336x realtime)...

...tools and I have some questions regarding the information given by the encoder (see below as an example). Encoding using libopus 1.0.2 (audio) ----------------------------------------------------- Input: 48kHz 1 channel Output: 1 channel (1 uncoupled) 20ms packets, 64kbit/sec VBR Preskip: 312 Encoding complete ----------------------------------------------------- Encoded: 6.86 seconds Runtime: 1e-06 seconds (6.86e+06x realtime) Wrote: 57354 bytes, 343 packets, 9 pages Bitrate: 66.0921kbit/s (without overhead) Rate range: 48.8kbit/s to 110.4kbit/s...

Hi, I'm playing around using Opus in a 'chunked' streaming context, where chunks of media are served in separate HTTP responses. I am trying to hunt down the source of some clicks-and-pops during playback, and while it is very likely that these glitches are due to the low quality of my code, I wanted to ask if the admonition in the API docs[1] that "encoder state *must*

...ogical stream 1 ended Here is my code: #include <stdio.h> #include <stdlib.h> #include "ogg/ogg.h" //Some structs to help build the headers. struct OggHeader { unsigned char magicSignature[8]; unsigned char version; unsigned char channelCount; unsigned short preSkip; unsigned int sampleRate; unsigned short outputGain; unsigned char mappingFamily; }; struct OggCommentHeader { unsigned char magicSignature[8]; unsigned int vendorStringLength; //Must be set to 0 //In-between here we would place out vendor string, if we had one. unsigne...

...C\Audacity\Test-Sweeps\02 Sweep (0 -20kHz at 96kHz) log.flac" "D:\Work\Ulrich\Musik\test.opus" Encoding using libopus 1.3 (audio) ----------------------------------------------------- Input: 96 kHz, 1 channel Output: 1 channel (1 uncoupled) 20ms packets, 56 kbit/s VBR Preskip: 312 Encoding complete ----------------------------------------------------- Encoded: 1 minute and 0.02 seconds Runtime: 1 second (60.02x realtime) Wrote: 749625 bytes, 3001 packets, 63 pages Bitrate: 98.9456 kbit/s (without overhead) Instant rates: 4...

...ing_libopusi1.3.1m(audio)av1B20De_A12C8Dopus4me4mn24mc 24m--bitrate 12 --downmix-mono sweep.wav sweep.opus1B61Dn_A7C1C4mn4mc24m1B11Dc_A6C24me24mn24mc1B ----------------------------------------------------- Input: 48 kHz, 1 channel Output: 1 channel (1 uncoupled) 20ms packets, 12 kbit/s VBR Preskip: 312 Encoding0complete06 1440x realtime, 9.854 kbit/s ----------------------------------------------------- Encoded: 1 minute and 51.34 seconds Runtime: 2 seconds (55.67x realtime) Wrote: 127667 bytes, 5567 packets, 114 pages Bitrate: 8.49542 kbit/s (without overhead) Ins...

...ck Artist" --title "Track Title" "etmp7!1!5.wav" "etmp7!1!5.opus" Encoding using libopus 1.0.1-rc3 (audio) ----------------------------------------------------- Input: 44.1kHz 2 channels Output: 2 channels (2 coupled) 20ms packets, 128kbit/sec VBR Preskip: 356 Encoding completee+004x realtime, 132.4kbit/s ----------------------------------------------------- Encoded: 8.02 seconds Runtime: 1e-006 seconds (8.02e+006x realtime) Wrote: 128413 bytes, 401 packets, 11 pages Bitrate: 126.856kbit/s (without overhead) Rate ran...

...of each one (and lose the corresponding samples from the end of the previous chunk). If you're putting these frames in, e.g., Ogg, then you can start a new chain for each chunk, which will indicate to the decoder that it needs to reset between them. Make sure you're properly setting the preskip value in the header to get it to skip the padding samples at the start, and encoding at least that many samples extra to flush the buffered samples at the end. That will ensure you're at least encoding and decoding the right samples (at some efficiency cost). However, because of the lossy...

...s expected in the media player of choice. Then I converted it to opus: % opusenc test.flac test.opus Encoding using libopus 1.1.3 (audio) ----------------------------------------------------- Input: 44.1kHz 2 channels Output: 2 channels (2 coupled) 20ms packets, 96kbit/sec VBR Preskip: 356 Encoding complete ----------------------------------------------------- Encoded: 5 minutes and 18.68 seconds Runtime: 8 seconds (39.83x realtime) Wrote: 3616359 bytes, 15934 packets, 321 pages Bitrate: 90.1199kbit/s (without overhead) Insta...

...> -20kHz at 96kHz) log.flac" "D:\Work\Ulrich\Musik\test.opus" > Encoding using libopus 1.3 (audio) > ----------------------------------------------------- > Input: 96 kHz, 1 channel > Output: 1 channel (1 uncoupled) > 20ms packets, 56 kbit/s VBR > Preskip: 312 > > Encoding complete > ----------------------------------------------------- > Encoded: 1 minute and 0.02 seconds > Runtime: 1 second > (60.02x realtime) > Wrote: 749625 bytes, 3001 packets, 63 pages > Bitrate: 98.9456 kbi...