#11351: Native AAC-enocoder doesn't create constant bitrate.
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Reporter: maxmanus | Owner: (none)
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: native aac | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Balling):
> I'm not sure I understand.
Bluetooth A2DP supports AAC. It is literally the only codec in Apple after
Apple removed AptX in MacOS.
>At that bitrate, shouldn't the quality be the same?
Nah, Qaac from Apple is superior.
>Now when using qaac standalone together with ffmpeg the duration of the
audio and video always slightly different
That is because Apple uses 2112 samples and we use 1024 samples of
priming. those should be removed, as they are just garbage. It is even
more complex in HE-AAC(v2).
>I read that if a delay is in the metadata it will get deleted with qaac.
Yes, qaac decoder supports sample accurate removal of both two styles of
gapless metadata, ITunSMPB and edit lists.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11351#comment:8>
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