[FFmpeg-trac] #2686(avcodec:open): Native AAC encoder collapses at high bitrates on some samples
FFmpeg
trac at avcodec.org
Sun May 4 17:02:57 CEST 2014
#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 Timothy_Gu):
Replying to [comment:281 Kamedo2]:
> '''ABR with -aac_coder fast'''
> Min / '''Average''' / Max bitrate: 128 / '''134''' / 141 kbps
> Average Speed: '''28.0'''x
> ffmpeg_r62950_v8f -i %i -c:a aac -strict experimental -b:a 128k
-aac_coder fast %o
> This is fast, but with very bad quality. I don't know if there's good
use of this option.
It is supposed to sound bad: [http://ffmpeg.org/ffmpeg-
codecs.html#Options-2]:
> This method sets a constant quantizer for all bands. This is the fastest
of all the methods, yet produces the worst quality.
Also, can you test -coder twoloop?
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Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:284>
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