#7550: Audible artifacts when converting from WAV to AAC
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Reporter: sleroux | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: aac | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by sleroux):
Hi @cehoyos. Thank you for your comment.
> Your input sample is completely silent between 5:30:930 and 5:30:940.
From what I can hear here, it is not completely silent in the original:
{{{
ffplay -ss 00:05:29 http://www.chicoree.fr/pub/ffmpeg-wav-to-aac-
artifacts/EP26-wav-to-aac-artifacts-orig.wav
}}}
If you use a visualization tool, you may need to look at the waveform
using a log/dB scale instead of a linear one.
The speaker saids "[...]Look at the Bluetooth hardware indi`^`cator you
may see it blinks rapidly[...]", where `^` denotes the point where the
artifact is audible. It's while the "I" sound is decaying, and just before
the attack for the "CA" sound.
With quality headphones, I can clearly hear the difference with
{{{
ffplay -ss 00:05:29 http://www.chicoree.fr/pub/ffmpeg-wav-to-aac-
artifacts/EP26-wav-to-aac-artifacts-ffmpeg-static-latest.mp4
}}}
In that latter case, there is undoubtedly some extra noise on the right
channel. Actually, this is that asymmetry that makes me noticed it.
Let me know if it was unclear.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7550#comment:3>
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