proc av_stereo3d_alloc(): AVStereo3D {.importc, cdecl, ...raises: [], tags: [],
                                       forbids: [].}

proc av_stereo3d_create_side_data(frame: ptr AVFrame): ptr AVStereo3D {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_stereo3d_from_name(name: cstring): cint {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_stereo3d_type_name(type: cuint): cstring {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}