proc av_content_light_metadata_alloc(size: ptr csize_t): ptr AVContentLightMetadata {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

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

proc av_mastering_display_metadata_alloc(): ptr AVMasteringDisplayMetadata {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

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