Commits on May 28, 2021

1. Support WMA files, including those with embedded album art …

   The tag library supports WMA, so add the mimetype.
   
   Some wma files have embedded album art encoded as a video stream
   alongside the audio:
   
   ```
   Input #0, asf, from '01. Emergency Pulloff.wma':
     Metadata:
       (snip)
     Duration: 00:03:11.47, start: 0.000000, bitrate: 129 kb/s
       Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 200x200 [SAR 96:96 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
       Metadata:
         comment         : Cover (front)
       Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 128 kb/s
   Output #0, opus, to '/tmp/output.opus':
   Output file #0 does not contain any stream
   ```
   
   The `-map 0:0` passed to ffmpeg is selecting the video stream to
   transcode, then `-vn` says not to transcode video, so the whole process
   returns an error code:
   
   ```
   2021/05/28 18:59:09 transcoding according to transcoding profile of 96k
   2021/05/28 18:59:09 serving transcode `02. Cotton Patch Rag.wma`: cache [opus/96k] miss!
   2021/05/28 18:59:09 serving transcode `02. Cotton Patch Rag.wma`: error: starting transcode: running ffmpeg: exit status 1
   ```
   
   I believe the correct solution here is to use an _audio_ stream
   specifier, as in `-map 0:a:0`.  Doing this selects the audio and
   successfully performs the transcode.

   

   thirtythreeforty committed May 28, 2021
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