Attempting to extract the audio stream from a video I recorded fails because
the mp3 encoder cannot be found:
$ ffmpeg -i regulatory-science-models.mp4 reg-models.mp3
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'regulatory-science-models.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41isomiso2
creation_time : 2020-08-13T18:57:21.000000Z
encoder : x264
Duration: 00:43:56.93, start: 0.000000, bitrate: 214 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661),
yuv420p, 960x542 [SAR 542:541 DAR 960:541], 109 kb/s, 30 fps, 30 tbr, 3k tbn,
60 tbc (default)
Metadata:
creation_time : 2020-08-13T18:57:21.000000Z
handler_name : VideoHandler
Stream #0:1(eng): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p,
99 kb/s (default)
Metadata:
creation_time : 2020-08-13T18:57:21.000000Z
handler_name : SoundHandler
Automatic encoder selection failed for output stream #0:0. Default encoder
for format mp3 (codec mp3) is probably disabled. Please choose an encoder
manually.
Error selecting an encoder for stream 0:0
The ffmpeg codecs web page <https://ffmpeg.org/ffmpeg-codecs.html> shows an
encoder for mjpeg (motion jpeg), but not one for mp3.
Where do I look for codec mp3 and how do I put it where it should be for
ffmpeg to find? Or, is there another tool I can use to extract the audio
stream from an .mp4 I created so I can test my sound system with a file I
know has recorded audio?
Rich
