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Opus / Re: Opus gapless and glitchness encoding
Last post by Garf -
Conclusions so far from discussion with jmvalin:

1) The correct way to handle this is to do the split in libopusenc. This will be gapless and glitchless. Everything else is going to be some kind of workaround that can still fail for pathological samples.

2) The signal in this file behaves badly in digital filters when they assume the signal before/after they operate is 0 (this is the default). To prevent this, you need to extend the signal, for example with a simple LPC predictor. Opus does this for the *end* of files, but not at the start. (https://github.com/xiph/libopusenc/blob/master/src/opusenc.c#L1147) I confirmed by mixing the Vorbis and Opus encodes that it's the start of the second file that glitches, not the end of the first one.

3) This needs to happen in both the resampler and the encoder. Easiest would be to have the resampler always do it, and feed the extended output to the encoder.

4) Vorbis implements it also for the start of files (https://github.com/xiph/vorbis/blob/ea8b03fce93444cb3cf0131909e15b4f8856e863/lib/block.c#L416) which is why it behaves so well here. (And obviously it can't fail at the resampling step).
5
MP3 - General / Re: Lame 3.100 has been released
Last post by Rollin -
It seems that there is some bug in original build from tmkk. On some files when encoding with -S --noreplaygain -V 0 encoder crashes with error and resulting mp3 file is corrupted.
Code: [Select]
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
LAME 3.100 32bits (http://lame.sf.net)
CPU features: MMX (ASM used), SSE (ASM used), SSE2
polyphase lowpass filter disabled
Encoding D:\Music\I Love Disco Diamonds Collection\I Love Disco Diamonds Collection Vol. 14\02. Yeti.wav
      to D:\Music\I Love Disco Diamonds Collection\I Love Disco Diamonds Collection Vol. 14\02. Yeti.mp3
Encoding as 44.1 kHz j-stereo MPEG-1 Layer III VBR(q=0)
Assertion failed!

Program: D:\0__CODECS\Lossy\LAME\3.100\lame_tmkk.exe
File: ../../libmp3lame/vbrquantize.c, Line 948

Expression: vbrsf[sfb] >= vbrsfmin[sfb]
Windows 7 32 bit, core i3 3245
File is too long to share here, but if someone is interested, i can send link in PM. It is track #2 from CD #14 from compilation "I Love Disco Diamonds Collection"
9
General - (fb2k) / Re: Win 10 1809: Rating stars
Last post by musicmusic -
It seems to now be working correctly on my laptop with the 17763.288 preview update. Perhaps someone else on the release preview ring could check if they're seeing the same.

[Edit] The latest preview cumulative update is in fact 17763.292.
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