[FFmpeg-trac] #6704(undetermined:new): No duration for G.729 samples

[FFmpeg]

#6704: No duration for G.729 samples
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  minor      |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  g729
             Blocked By:             |  duration
Reproduced by developer:  0          |               Blocking:
                                     |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 As reported by Dave Horton (who provided the sample), raw G.729 files do
 not show a duration which can lead to warnings on encoding.
 {{{
 $ ffmpeg -f g729 -i callee.raw -ar 44100 out.wav
 ffmpeg version N-87628-g148c8e8 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-gpl --cc=/usr/local/gcc-6.3.0/bin/gcc
   libavutil      55. 77.101 / 55. 77.101
   libavcodec     57.106.104 / 57.106.104
   libavformat    57. 83.100 / 57. 83.100
   libavdevice    57.  9.101 / 57.  9.101
   libavfilter     6.106.100 /  6.106.100
   libswscale      4.  7.103 /  4.  7.103
   libswresample   2.  8.100 /  2.  8.100
   libpostproc    54.  6.100 / 54.  6.100
 [g729 @ 0x30a7400] Estimating duration from bitrate, this may be
 inaccurate
 Guessed Channel Layout for Input Stream #0.0 : mono
 Input #0, g729, from 'callee.raw':
   Duration: 00:00:20.48, start: 0.000000, bitrate: 8 kb/s
     Stream #0:0: Audio: g729, 8000 Hz, mono, s16
 Stream mapping:
   Stream #0:0 -> #0:0 (g729 (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf57.83.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono,
 s16, 705 kb/s
     Metadata:
       encoder         : Lavc57.106.104 pcm_s16le
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -82; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -77; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -71; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -66; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -60; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -55; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -49; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -44; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -38; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -33; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -27; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -22; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -16; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -11; changing to 0. This may result in incorrect timestamps in
 the output file.
 [wav @ 0x30b2600] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: -5; changing to 0. This may result in incorrect timestamps in the
 output file.
 size=    1764kB time=00:00:00.26 bitrate=54354.2kbits/s speed=5.06x
 video:0kB audio:1764kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.004318%
 }}}
 The estimated duration of 20 seconds is correct, the shown encoded
 duration is wrong, also reproducible with FFplay.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6704>
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