[FFmpeg-trac] #2686(avcodec:open): Native AAC encoder collapses at high bitrates on some samples
FFmpeg
trac at avcodec.org
Tue Nov 25 20:14:55 CET 2014
#2686: Native AAC encoder collapses at high bitrates on some samples
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Reporter: Kamedo2 | Owner:
Type: defect | klaussfreire
Priority: normal | Status: open
Version: git-master | Component: avcodec
Keywords: aac | Resolution:
regression | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by klaussfreire):
Well, it is based on it, but it sounded very different to me, as it has
important bugfixes. The encoded versions I mean, not the differences.
Namely, in codebook_trellis_rate/encode_window_bands_info, it was using
the wrong scalefactors and that's a major bug when encoding transients.
And on the RD-reduction step, both v7 and v8g were assuming decreasing
scalefactors had a predictable effect on distortion, and v9 just
recomputes distortion, which proved to be a big improvement on VBR.
That pretty much singlehandedly fixed the biggest issues in fatboy.
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Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:331>
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