[FFmpeg-trac] #2686(avcodec:open): Native AAC encoder collapses at high bitrates on some samples
FFmpeg
trac at avcodec.org
Sat Oct 17 17:28:49 CEST 2015
#2686: Native AAC encoder collapses at high bitrates on some samples
-------------------------------------+-------------------------------------
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 Kamedo2):
I am testing the combination of these options on N-76111-g8c9c8fd.
{{{
["-b:a 8k", "-b:a 80k", "-b:a 160k", "-b:a 320k", "-b:a 530k", "-q:a 0.1",
"-q:a 2", "-q:a 320k"],
["-profile:a aac_ltp", "-profile:a aac_main -aac_pred 1 -aac_pns 0",
"-profile:a aac_low -aac_pns 1", "-profile:a mpeg2_aac_low"],
["-ar 8000", "-ar 11025", "-ar 24000", "-ar 44100", "-ar 48000", "-ar
96000"],
["", "-cutoff 15000", "-cutoff 22050"]
}}}
Test tracks are ffmpeg_aacvbr_pulse1.flac(12.12sec),
ffmpeg_anmr_error.flac(2.32sec), ffmpeg_96k_error.flac(2.01sec).
{{{-profile:a aac_ltp}}} encoding is currently slower than the realtime,
about 0.9x on 44.1kHz. Is it the intended behavior?
--
Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:442>
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