[FFmpeg-trac] #5057(undetermined:new): master broke AVCodecContext compatibility with LibAV project

[FFmpeg]

#5057: master broke AVCodecContext compatibility with LibAV project
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             Reporter:  jyavenard    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Cigaes):

 Replying to [comment:15 jyavenard]:
 > We will not be able to create on the heap a AVCodecContext
 [[BR]]
 You have got a bug, right here.

 Applications are not allowed to allocate {{{AVCodecContext}}} themselves.
 They have to use the library functions: {{{avcodec_alloc_context3()}}} for
 example. The size of {{{AVCodecContext}}} can (and ''does'') change due to
 new fields added to the end without notice; if you allocate it using some
 kind of {{{malloc(sizeof(AVCodecContext))}}} code, it will be too small
 for later versions of the library.

 If you allocate using {{{avcodec_alloc_context3()}}} and access the field
 using {{{av_opt_set_int()}}} and {{{av_opt_get_int()}}}, your code do not
 have to know its exact size.

 > get the libAV folks to change those fields so AVCodecContext members

 If, after updating your code to fix the API use, you still need that, I
 suggest you do just that. But I do not think this is necessary.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5057#comment:18>
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