#2686: Native AAC encoder collapses at high bitrates on some samples
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Reporter: Kamedo2 | Owner:
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: aac | Blocked By:
regression | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
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Comment (by Kamedo2):
> However, you can get (I think) a similar result by specifying both -q:a
and -b:a, like so:
>
> {{{
> ffmpeg -i somefile.flac -c:a aac -b:a 256k -q:a 1 -strict experimental
somefile.aac
> }}}
>
> Although that seldom gives you 256k. The bitrate there is like a lower
bound (aim for 256k, spend more if needed).
I tried it over 128 different songs and the result was:
{{{-b:a 256k -q:a 1}}}
- Average 247kbps
- SD +/-33kbps
- Min 161kbps
- Max 300kbps
{{{-q:a 1}}}
- Average 235kbps
- SD +/-30kbps
- Min 154kbps
- Max 287kbps
(comment:160 change is not applied in this test.)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:175>
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