Comments on: Extract Audio from Video Files to WAV using FFmpeg http://savvyadmin.com/extract-audio-from-video-files-to-wav-using-ffmpeg/ For savvy admins everywhere... Thu, 17 May 2012 16:06:23 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: gmendoza http://savvyadmin.com/extract-audio-from-video-files-to-wav-using-ffmpeg/comment-page-1/#comment-1021 gmendoza Fri, 16 Dec 2011 17:12:26 +0000 http://www.savvyadmin.com/?p=537#comment-1021 Hey there! You need to compile FFmpeg with opencore-amr support. FFmpeg as it's compile on your system does not know how to decode your audio stream. The following two lines from your output can help you when troubleshooting other scenarios. <b>Input #0, amr, from ‘sound2.3gp’:<b> ... <b>Decoder (codec id 73728) not found for input stream #0.</b> See this post to enable opencore-amr support: http://ubuntuforums.org/showpost.php?p=7584660&postcount=409 Hope this helps! Hey there! You need to compile FFmpeg with opencore-amr support. FFmpeg as it’s compile on your system does not know how to decode your audio stream. The following two lines from your output can help you when troubleshooting other scenarios.

Input #0, amr, from ‘sound2.3gp’:
…
Decoder (codec id 73728) not found for input stream #0.

See this post to enable opencore-amr support:
http://ubuntuforums.org/showpost.php?p=7584660&postcount=409

Hope this helps!

]]> By: sumitavo biswas http://savvyadmin.com/extract-audio-from-video-files-to-wav-using-ffmpeg/comment-page-1/#comment-1020 sumitavo biswas Fri, 16 Dec 2011 12:24:57 +0000 http://www.savvyadmin.com/?p=537#comment-1020 Hi friends, i am facing a issue..i have a requirement to convert a .3gp file to .wav file. We have to use ffmpeg for the same, but currently the transcoded file(.wav file) do not play, it is of 0 bytes…can anyone help me how to do it? Following is the stacktrace $/opt/csw/bin/ffmpeg -i sound2.3gp -acodec pcm_mulaw -ar 8000 -ac 1 -f wav 3gp.wav FFmpeg version SVN-r21156-snapshot, Copyright (c) 2000-2010 Fabrice Bellard, et al. built on Feb 12 2010 01:57:40 with gcc 4.3.4 configuration: –prefix=/opt/csw –enable-shared –disable-static –enable-ffplay –enable-runtime-cpudetect –enable-libtheora –enable-libvorbis –enable-libx264 –enable-libxvid –enable-libmp3lame –enable-gpl –enable-postproc –enable-avfilter –enable-avfilter-lavf –bindir=/opt/csw/bin/sparcv8 –libdir=/opt/csw/lib –incdir=/opt/csw/include libavutil 50. 7. 0 / 50. 7. 0 libavcodec 52.47. 0 / 52.47. 0 libavformat 52.46. 0 / 52.46. 0 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 1.15. 0 / 1.15. 0 libswscale 0. 8. 0 / 0. 8. 0 libpostproc 51. 2. 0 / 51. 2. 0 [amr @ 442c0]max_analyze_duration reached [amr @ 442c0]Estimating duration from bitrate, this may be inaccurate Input #0, amr, from ‘sound2.3gp’: Duration: N/A, bitrate: N/A Stream #0.0: Audio: samr / 0x726D6173, 8000 Hz, 1 channels File ’3gp.wav’ already exists. Overwrite ? [y/N] y Output #0, wav, to ’3gp.wav’: Stream #0.0: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Decoder (codec id 73728) not found for input stream #0. Hi friends, i am facing a issue..i have a requirement to convert a .3gp file to .wav file. We have to use ffmpeg for the same, but currently the transcoded file(.wav file) do not play, it is of 0 bytes…can anyone help me how to do it? Following is the stacktrace

$/opt/csw/bin/ffmpeg -i sound2.3gp -acodec pcm_mulaw -ar 8000 -ac 1 -f wav 3gp.wav
FFmpeg version SVN-r21156-snapshot, Copyright (c) 2000-2010 Fabrice Bellard, et al.
built on Feb 12 2010 01:57:40 with gcc 4.3.4
configuration: –prefix=/opt/csw –enable-shared –disable-static –enable-ffplay –enable-runtime-cpudetect –enable-libtheora –enable-libvorbis –enable-libx264 –enable-libxvid –enable-libmp3lame –enable-gpl –enable-postproc –enable-avfilter –enable-avfilter-lavf –bindir=/opt/csw/bin/sparcv8 –libdir=/opt/csw/lib –incdir=/opt/csw/include
libavutil 50. 7. 0 / 50. 7. 0
libavcodec 52.47. 0 / 52.47. 0
libavformat 52.46. 0 / 52.46. 0
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 1.15. 0 / 1.15. 0
libswscale 0. 8. 0 / 0. 8. 0
libpostproc 51. 2. 0 / 51. 2. 0
[amr @ 442c0]max_analyze_duration reached
[amr @ 442c0]Estimating duration from bitrate, this may be inaccurate
Input #0, amr, from ‘sound2.3gp’:
Duration: N/A, bitrate: N/A
Stream #0.0: Audio: samr / 0x726D6173, 8000 Hz, 1 channels
File ’3gp.wav’ already exists. Overwrite ? [y/N] y
Output #0, wav, to ’3gp.wav’:
Stream #0.0: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Decoder (codec id 73728) not found for input stream #0.

]]> By: Purab Gujar http://savvyadmin.com/extract-audio-from-video-files-to-wav-using-ffmpeg/comment-page-1/#comment-1010 Purab Gujar Thu, 11 Aug 2011 04:38:59 +0000 http://www.savvyadmin.com/?p=537#comment-1010 I tried your command. But why do you suggest we use any codec at all when converting to wav? Just giving the wav format is sufficient. i.e. why use -acodec pcm_s16le instead of ffmpeg -i video.mkv -acodec -ac 2 -f wav -y audio.wav I tried your command. But why do you suggest we use any codec at all when converting to wav? Just giving the wav format is sufficient. i.e. why use -acodec pcm_s16le instead of ffmpeg -i video.mkv -acodec -ac 2 -f wav -y audio.wav

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