[FFmpeg-trac] #7114(avcodec:new): Add options to set some AVCodecContext's field

[FFmpeg]

#7114: Add options to set some AVCodecContext's field
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             Reporter:  jyavenard  |                     Type:  enhancement
               Status:  new        |                 Priority:  normal
            Component:  avcodec    |                  Version:  git-master
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
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 There's currently no options to set the following members of
 AVCodecContext via AVOptions, which are ABI dependent.

 extradata
 extradata_size
 opaque
 get_format
 codec_id

 that list isn't exhaustive obviously (but that's what we use today)

 which means you must hope that the binary definition of AVCodecContext
 hasn't changed between the header you use and the library you're linking
 to.

 One example would be if libavcodec was built with FF_API_CODEC_NAME set,
 all structure field would be shifted by 32 bytes.

 Seeing that the ABI of AVCodecContext isn't fixed, one can't guarantee the
 outcome of using an external libavcodec shared lib.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7114>
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