[FFmpeg-trac] #683(undetermined:closed): Very wrong number of channels when using libaacplus and ffmpeg

FFmpeg trac at avcodec.org
Thu Nov 24 14:57:09 CET 2011

#683: Very wrong number of channels when using libaacplus and ffmpeg
             Reporter:  bradskins    |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  0.7.7        |  undetermined
             Keywords:  libaacplus   |               Resolution:
  freebsd                            |  worksforme
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
Changes (by cehoyos):

 * keywords:  libaacplus audio stream freebsd => libaacplus freebsd
 * priority:  important => normal
 * status:  new => closed
 * resolution:   => worksforme


 I just tested your command line with both current git head and release/0.7
 (both static and shared libaacplus 2.0.2) and it works fine.

 > libaacplus: bad aac setting: br:32000, AACch:65536, AACsr:22050
 Given how libavcodec/libaacplus.c sets the channels, this is an unlikely
     /* number of channels */
     if (avctx->channels < 1 || avctx->channels > 2) {
         av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not
 allowed\n", avctx->channels);
         return -1;

     s->aacplus_handle = aacplusEncOpen(avctx->sample_rate,
                                  &samples_input, &max_bytes_output);
     if(!s->aacplus_handle) {
             av_log(avctx, AV_LOG_ERROR, "can't open encoder\n");
             return -1;

 An unrelated problem that made encoding to ADTS impossible was just fixed
 in git head and all future releases.

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/683#comment:1>
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