[FFmpeg-trac] #1784(avcodec:closed): internal aac encoder fails with 5.1 input
FFmpeg
trac at avcodec.org
Thu Oct 4 18:54:43 CEST 2012
#1784: internal aac encoder fails with 5.1 input
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Reporter: rogerdpack | Owner:
Type: defect | Status: closed
Priority: normal | Component: avcodec
Version: git-master | Resolution: worksforme
Keywords: aac | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by rogerdpack):
I recorded it from a directshow "record what you hear" device, at 5.1. I
also tested the samples from the link I previously posted, when I posted
it. But that's not "real" real-world either, is it?
So here is using a more "real world" 5.1 test case:
http://rogerdpack.t28.net/incoming/sintel.mpg
When used like this:
$ ffmpeg -i sintel.mpg -vn -acodec aac -strict experimental -ac 6 -ab
384k -t 30 sintel.mpg.aac_exp.aac
The result isn't "quite as bad" as with the small test samples (which lose
something like 4 channels out of 5), however, it appears to still lose 3
channels out of 6.
running it like this:
$ ffmpeg -i sintel.mpg -vn -acodec aac -aac_coder 0 -strict experimental
-ac 6 -ab 384k -t 30 sintel.mpg.aac_exp.acoder.aac
seems to get all 6 channels.
I'll report it on ffmpeg-devel, though I have no clue what aac_coder means
or does, it helps at least these particular cases, so...
-roger-
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1784#comment:6>
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