#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 Kamedo2):
Replying to [comment:402 atomnuker]:
> I cannot replicate this bug anymore so it's probably fixed, could you
test with the newest git master to see if it causes problems?
{{{
OK ffmpeg74678-g6701c92 -y -i ffmpeg_aac_error1.flac -c:a aac -strict
experimental -b:a 96k -ar 8000 out.mp4
OK ffmpeg74678-g6701c92 -y -i ffmpeg_aac_error1.flac -c:a aac -strict
experimental -q:a 1 -ar 8000 out.mp4
OK ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_error1.flac -c:a aac -strict
experimental -b:a 96k -ar 8000 out.mp4
OK ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_error1.flac -c:a aac -strict
experimental -q:a 1 -ar 8000 out.mp4
}}}
Yes, it was fixed.
> I'll look into what causes the faac coder to get stuck at high bitrates.
{{{
OK ffmpeg74678-g6701c92 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 19000 out.mp4
OK ffmpeg74678-g6701c92 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 17000 out.mp4
NG ffmpeg74678-g6701c92 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 15000 out.mp4
NG ffmpeg74678-g6701c92 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 13000 out.mp4
NG ffmpeg74678-g6701c92 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 11000 out.mp4
OK ffmpeg74678-g6701c92 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 9000 out.mp4
OK ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 19000 out.mp4
OK ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 17000 out.mp4
NG ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 15000 out.mp4
NG ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 13000 out.mp4
NG ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 11000 out.mp4
OK ffmpeg74721-g4bd99f7 -y -i ffmpeg_aac_lead_voice.flac -c:a aac -strict
experimental -b:a 320k -cutoff 9000 out.mp4
}}}
The bug still exists in the git master. It induces infinite loop when the
cutoff is 15, 13, 11kHz, but not 9kHz. When the cutoff is 7kHz, the
initial setup takes 16 seconds, which is unnaturally slow, but the encoded
sound is OK. ffmpeg_aac_lead_voice.flac is 44.1kHz '''mono'''.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:403>
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