#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 Kamedo2):
[[Image(http://i44.tinypic.com/2s805y0.png)]]
I used tx->frame_bits = FFMIN(2560, and psymodel.h line 32:
{{{
#define AAC_CUTOFF(s) (s->bit_rate ?
FFMIN3(FFMIN3(s->bit_rate/s->channels/2, 4000 + s->bit_rate/s->channels/4,
12000 + s->bit_rate/s->channels/16), 20000, s->sample_rate / 2):
(s->sample_rate / 2))
}}}
This is better on mono, surround, and on very low bitrates(such as 32kbps
stereo).
truncut.wav has few HF content, so the bitrate saturates in 172kbps.
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:53>
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