#2325: AAC audio delayed ~ 20 ms after conversion to PCM
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Reporter: BChap | Owner: (none)
Type: defect | Status: open
Priority: important | Component: avcodec
Version: git-master | Resolution:
Keywords: aac | Blocked By:
regression |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Changes (by MasterQuestionable):
* cc: MasterQuestionable (added)
* keywords: aac mov regression => aac regression
* component: undetermined => avcodec
* summary: MP4 AAC Audio is delayed by 2ms when converted to PCM => AAC
audio delayed ~ 20 ms after conversion to PCM
Comment:
͏ I don't think the "mp3dec" patch could be directly related.
͏ Though the gapless metadata thing could somewhat relate.
͏ However I much question the necessity of such metadata
implementation: much useless.
͏ Shall the player be able to make use of such: so shall they be able
to directly pre-filter the audio outright, without needing such metadata.
͏ (that shall eventually give nothing meaningful: for what's needed to
support gapless playback may be programmatically acquired by silence
detection)
\\
\\
͏ That causes the ~ 20 ms offset is primarily for:
͏ https://developer.apple.com/documentation/quicktime-file-
format/background_aac_encoding
͏ https://en.wikipedia.org/wiki/Gapless_playback#Compression_artifacts
͏ .
͏ Unsure about the appropriate handling really:
͏ Technically, these are part of the samples... whether sensible or
not.
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Ticket URL: <https://trac.ffmpeg.org/ticket/2325#comment:24>
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