[FFmpeg-trac] #7973(documentation:new): Provide info about default qualitiy for each codec

[FFmpeg]

#7973: Provide info about default qualitiy for each codec
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             Reporter:  UlfZibis     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  documentation                      |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 The default value for option -q is missing, at least for encoder=libx264.
 How to reproduce:
 - search on https://ffmpeg.org/ffmpeg-codecs.html
 - additionally try:
 {{{
 % ffmpeg -h encoder=libx264
 ffmpeg version 4.1.3
 built on gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
 }}}
 From the output of using this encoder, I can see, it seems to be 28.0, but
 this is nowhere documented.

 IMHO on https://ffmpeg.org/ffmpeg-codecs.html it should be possible to
 easily find for each codec:
 1. the default quality
 2. which option to use to change it (here -q)


 Additionally `ffmpeg -h encoder=blafoo` should give this info.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7973>
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