[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
             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           |

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:

 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...

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1784#comment:6>
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