[FFmpeg-trac] #2686(avcodec:open): Native AAC encoder collapses at high bitrates on some samples

FFmpeg trac at avcodec.org
Wed Oct 9 18:52:41 CEST 2013


#2686: Native AAC encoder collapses at high bitrates on some samples
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------

Comment (by Kamedo2):

 aacenc.c line 106 and 133, this properly worked, and the result 7350Hz aac
 mp4s were playable on FFmpeg, foobar2000 v1.2.9 and Media Player Classic.
 The decoding failed on faad and WMP.
 {{{
 static const uint8_t *swb_size_1024[] = {
     swb_size_1024_96, swb_size_1024_96, swb_size_1024_64,
     swb_size_1024_48, swb_size_1024_48, swb_size_1024_32,
     swb_size_1024_24, swb_size_1024_24, swb_size_1024_16,
     swb_size_1024_16, swb_size_1024_16, swb_size_1024_8, swb_size_1024_8
 };
 }}}
 {{{
 static const uint8_t *swb_size_128[] = {
     /* the last entry on the following row is swb_size_128_64 but is a
        duplicate of swb_size_128_96 */
     swb_size_128_96, swb_size_128_96, swb_size_128_96,
     swb_size_128_48, swb_size_128_48, swb_size_128_48,
     swb_size_128_24, swb_size_128_24, swb_size_128_16,
     swb_size_128_16, swb_size_128_16, swb_size_128_8, swb_size_128_8
 };
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:206>
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