[FFmpeg-trac] #6319(undetermined:new): Raw audio is x2 times slower than it should be

[FFmpeg]

#6319: Raw audio is x2 times slower than it should be
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  yujxmaxzcjcllko                    |                 Priority:  critical
               Status:  new          |                  Version:  3.2.4
            Component:               |               Blocked By:
  undetermined                       |  Reproduced by developer:  0
             Keywords:  raw-audio    |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: when converting mp3 file to raw audio file of format
 s16l and then converting it back to mp3, audio is slower x2 times.
 How to reproduce:
 {{{
 ffprobe 1.mp3
 ffmpeg -i 1.mp3 -y -f s16le 1.hex
 ffmpeg -f s16le -i 1.hex -y 1.mp3
 ffprobe 1.mp3
 }}}
 This is latest FFMPEG version. Output of ffprobe is:
 {{{
 Input #0, mp3, from '1.mp3':
   Metadata:
     encoder         : Lavf57.57.100
   Duration: 00:00:03.02, start: 0.023021, bitrate: 128 kb/s
     Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s
     Metadata:
       encoder         : Lavc57.66
 }}}
 and
 {{{
 Input #0, mp3, from '1.mp3':
   Metadata:
     encoder         : Lavf57.57.100
   Duration: 00:00:06.56, start: 0.025057, bitrate: 64 kb/s
     Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
 }}}
 If I change it to
 {{{
 ffmpeg -f s16le -ar 48000 -i 1.hex -y -b:a 128k 3.mp3
 }}}
 output frequency and bitrate are fixed, but audio is still x2 times slower
 (duration is still 6 seconds instead of 3). It should be 3.
 I think there's no need to upload example mp3, because this bug appears
 with any mp3.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6319>
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