>> No warnings here.
Interesting, I can replicate your results, but when I add some options for
sample rate and encoding to the output, that is when I see errors:
MacBook-Pro-6:g729-testing dhorton$ ffmpeg -y -f g729 -i caller.raw -ar 44100
-acodec pcm_s32le -f wav caller.wav
ffmpeg version N-87326-g3ffd3b7 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 7.3.0 (clang-703.0.29)
configuration: --enable-gpl --enable-nonfree --enable-libopus
--enable-libspeex --enable-libvpx --enable-libmp3lame --disable-optimizations
--disable-stripping --extra-cflags='-DDEBUG -O0 -g'
libavutil 55. 75.100 / 55. 75.100
libavcodec 57.106.101 / 57.106.101
libavformat 57. 82.100 / 57. 82.100
libavdevice 57. 8.101 / 57. 8.101
libavfilter 6.105.100 / 6.105.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
[g729 @ 0x7fc3d4000000] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, g729, from 'caller.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_s32le (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'caller.wav':
Metadata:
ISFT : Lavf57.82.100
Stream #0:0: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s32,
1411 kb/s
Metadata:
encoder : Lavc57.106.101 pcm_s32le
[wav @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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 @ 0x7fc3d4009e00] 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= 3528kB time=00:00:00.26 bitrate=108706.8kbits/s speed=2.28x
video:0kB audio:3528kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 0.002823%
** without output options, no errors
MacBook-Pro-6:g729-testing dhorton$ ffmpeg -y -f g729 -i caller.raw -f wav
caller.wav
ffmpeg version N-87326-g3ffd3b7 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 7.3.0 (clang-703.0.29)
configuration: --enable-gpl --enable-nonfree --enable-libopus
--enable-libspeex --enable-libvpx --enable-libmp3lame --disable-optimizations
--disable-stripping --extra-cflags='-DDEBUG -O0 -g'
libavutil 55. 75.100 / 55. 75.100
libavcodec 57.106.101 / 57.106.101
libavformat 57. 82.100 / 57. 82.100
libavdevice 57. 8.101 / 57. 8.101
libavfilter 6.105.100 / 6.105.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
[g729 @ 0x7ff249810600] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, g729, from 'caller.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 'caller.wav':
Metadata:
ISFT : Lavf57.82.100
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, mono, s16,
128 kb/s
Metadata:
encoder : Lavc57.106.101 pcm_s16le
size= 320kB time=00:00:00.26 bitrate=9862.0kbits/s speed=2.61x
video:0kB audio:320kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 0.023804%
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