#2686: Native AAC encoder collapses at high bitrates on some samples
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Reporter: Kamedo2 | Owner:
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: aac | Blocked By:
regression | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
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Comment (by klaussfreire):
Replying to [comment:221 Kamedo2]:
> What was the "quite significant bugs" of v6? I didn't find any problem
in a non-blind listening test, and the v6 was extensively tested over many
songs, speeches, tv source, and artificial sounds, and I believe v6 is
safe and stable.
Well, for one, holes (bands below hearing threshold) would bork a tonality
boost loop, creating all sorts of issues, most notably when using short
transform length, since the borking would get carried over to other
windows.
In essence, transients were broken. They still sounded alright most of the
time, probably because of pure chance (ie: maybe there were no holes). But
signals like Mahler, castanets and harpishcords tended to expose the bugs
at lower bit rates.
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:222>
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