[FFmpeg-user] Unable to convert to GSM

[Aditya Satyavada]

A change of ffmpeg build (and OS in my case did the trick !).

The output was as shown here:

subprocess.call(['ffmpeg', '-y', '-f', 'mp3', '-i', '-', '-acodec', 'pcm_s16le', '-vn', '-f', 'wav', '-'])
subprocess.call(['ffmpeg', '-y', '-f', 'wav', '-i', '/tmp/tmp6v04vgug', '-b:a', '13k', '-ar', '8000', '-f', 'gsm', '/tmp/tmp3ii32s53'])
subprocess output: b'ffmpeg version 3.2.12-1~deb9u1 Copyright (c) 2000-2018 the FFmpeg developers'
subprocess output: b'  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516'
subprocess output: b"  configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared"
subprocess output: b'  libavutil      55. 34.101 / 55. 34.101'
subprocess output: b'  libavcodec     57. 64.101 / 57. 64.101'
subprocess output: b'  libavformat    57. 56.101 / 57. 56.101'
subprocess output: b'  libavdevice    57.  1.100 / 57.  1.100'
subprocess output: b'  libavfilter     6. 65.100 /  6. 65.100'
subprocess output: b'  libavresample   3.  1.  0 /  3.  1.  0'
subprocess output: b'  libswscale      4.  2.100 /  4.  2.100'
subprocess output: b'  libswresample   2.  3.100 /  2.  3.100'
subprocess output: b'  libpostproc    54.  1.100 / 54.  1.100'
subprocess output: b'Guessed Channel Layout for Input Stream #0.0 : mono'
subprocess output: b"Input #0, wav, from '/tmp/tmp6v04vgug':"
subprocess output: b'  Duration: 00:00:01.46, bitrate: 353 kb/s'
subprocess output: b'    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s'
subprocess output: b"Output #0, gsm, to '/tmp/tmp3ii32s53':"
subprocess output: b'  Metadata:'
subprocess output: b'    encoder         : Lavf57.56.101'
subprocess output: b'    Stream #0:0: Audio: gsm (libgsm), 8000 Hz, mono, s16, 13 kb/s'
subprocess output: b'    Metadata:'
subprocess output: b'      encoder         : Lavc57.64.101 libgsm'
subprocess output: b'Stream mapping:'
subprocess output: b'  Stream #0:0 -> #0:0 (pcm_s16le (native) -> gsm (libgsm))'
subprocess output: b'Press [q] to stop, [?] for help'
subprocess output: b'size=       2kB time=00:00:01.48 bitrate=  13.2kbits/s speed= 447x'
subprocess output: b'video:0kB audio:2kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%'

libavformat version has indeed changed.

Although I’m honestly not sure how this affects what I was attempting to do.

Is it possible that the “Lavc57.64.101” encoder was missing. Because of which this was happening ?


> On 16-Feb-2019, at 2:05 PM, Ted Park <kumowoon1025 at gmail.com> wrote:
> 
>> subprocess output: b'  libavformat    58. 20.100 / 58. 20.100’
> 
>> subprocess output: b'  libavformat    56. 40.101 / 56. 40.101’
> 
> This is probably the more significant difference. Build a newer ffmpeg/update on the ubuntu side.
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> 
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".