[FFmpeg-user] feature request: show if PCM audio is going to "wav" output or not.

[Roger Pack]

Hello.

I noticed the other day that the difference in writing to a ".wav"
file, for audio, vs to a ".raw" file, well, actually, there *is* no
difference in the output, viz:

convert to raw:
$ ffmpeg -i sintel.mpg -f s16le -acodec pcm_s16le out.2.raw
ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg developers
  built on Mar 13 2013 21:26:48 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl...
  libavutil      52. 19.100 / 52. 19.100
  libavcodec     55.  0.100 / 55.  0.100
  libavformat    55.  0.100 / 55.  0.100
  libavdevice    54.  4.100 / 54.  4.100
  libavfilter     3. 45.103 /  3. 45.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpeg @ 01fe9c40] max_analyze_duration 5000000 reached at 5024000 microseconds
Input #0, mpeg, from 'sintel.mpg':
  Duration: 00:14:47.58, start: 0.233367, bitrate: 4132 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480
[SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
Output #0, s16le, to 'out.2.raw':
  Metadata:
    encoder         : Lavf55.0.100
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, 5.1(side), s16, 4608 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (ac3 -> pcm_s16le)

And convert to wav:

$ ffmpeg -i sintel.mpg out.wav
ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg developers
  built on Mar 13 2013 21:26:48 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl ...
  libavutil      52. 19.100 / 52. 19.100
  libavcodec     55.  0.100 / 55.  0.100
  libavformat    55.  0.100 / 55.  0.100
  libavdevice    54.  4.100 / 54.  4.100
  libavfilter     3. 45.103 /  3. 45.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpeg @ 0228c080] max_analyze_duration 5000000 reached at 5024000 microseconds
Input #0, mpeg, from 'sintel.mpg':
  Duration: 00:14:47.58, start: 0.233367, bitrate: 4132 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480
[SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
Output #0, wav, to 'out.2.wav':
  Metadata:
    ISFT            : Lavf55.0.100
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
5.1(side), s16, 4608 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (ac3 -> pcm_s16le)


Suggestion/feature request: output like this:
  Stream #0:1 -> #0:0 (ac3 -> pcm_s16le [wav])

or its like (show the container somehow).
Cheers!
-roger-