[FFmpeg-devel] [PATCH] AAC decoder channel layout support

[Jason Millard]

I _think_ I have seen this issue before, demuxer passes and
> incomplete/invalid first frame on to the decoder (which is fine so far),
> but the decoder parses out some invalid stream properties out of that
> broken frame and then sticks to them even if a valid frame comes up
> later.
> Which means that the first frame passed to the decoder must be "100%"
> valid or it will decode nothing at all.
> (note that in the details my description probably isn't right, but for
> what I can tell that seemed to be the issue in a general sense as far as
> I could figure out).
>
>
Yeh, in the attachment sample, it threw out the junk before the first sync.
But what it thought was the first sync actually isn't. The correct sync is
actually trapped inside that first frame.

[aac @ 0x103ae00]aac_decode_frame() - enter - show_bits: 0FFF
[aac @ 0x103ae00]00000000  ff f0 32 c0 d0 04 80 60 3f ff f9 5c 80 2c c2 44
..2....`?..\.,.D
[aac @ 0x103ae00]00000010  21 1b 55 65 91 90 92 37 88 86 21 60 aa 80 02 08
!.Ue...7..!`....


See ff f9

-- Jason