[FFmpeg-trac] #566(undetermined:new): Encoding AAC stereo audio which starts silently to mpeg-ts causes 0-channel audio output.

[FFmpeg]

#566: Encoding AAC stereo audio which starts silently to mpeg-ts causes 0-channel
audio output.
-------------------------------------+-------------------------------------
             Reporter:  tungj        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by tungj):

 Replying to [comment:8 terran]:
 > This ticket seems to be closely related to #542. We found that reverting
 a change from last November also provides a workaround. See the ticket
 fore more details:
 >
 > https://ffmpeg.org/trac/ffmpeg/ticket/542

 Thanks for the suggestion, but it seems the problem is still reproducible
 after adding back the rate tolerance from change
 2c5168afed8ddd798dae5909dba85ae3b611f894 as mentioned on comment 51 of
 #542.

 {{{

 diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
 index 7410112..eeaad71 100644
 --- a/libavcodec/libx264.c
 +++ b/libavcodec/libx264.c
 @@ -296,6 +296,9 @@ static av_cold int X264_init(AVCodecContext *avctx)
      if (avctx->level > 0)
          x4->params.i_level_idc = avctx->level;

 +    x4->params.rc.f_rate_tolerance =
 +        (float)avctx->bit_rate_tolerance/avctx->bit_rate;
 +
      x4->params.pf_log               = X264_log;
      x4->params.p_log_private        = avctx;
      x4->params.i_log_level          = X264_LOG_DEBUG;

 }}}

 {{{ ffprobe initialSilence.ts }}} still returns (0 channels) after
 recompiling and rerunning  {{{ ffmpeg -y -i '../initialSilence.mp4' -f
 mpegts -t 10 -acodec libfaac -ab 40k -ar 22050 initialSilence.ts }}}; and
 the audio track is lost when running {{{ffmpeg -y -i 'initialSilence.ts'
 -vcodec copy -acodec libfaac -ab 40k -ar 22050 output.mp4}}}.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/566#comment:9>
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