proc av_find_info_tag(arg: cstring; arg_size: cint; tag1, info: cstringArray): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_get_known_color_name(color_idx: cint; rgb: ptr ptr uint8): cstring {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_parse_color(rgba_color: ptr uint8; color_string: cstring; slen: cint;
                    log_ctx: pointer): cint {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_parse_ratio(q: ptr AVRational; str: cstring; max, log_offset: cint;
                    log_ctx: pointer): cint {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_parse_time(timeval: ptr int64; timestr: cstring; duration: cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_parse_video_rate(rate: ptr AVRational; str: cstring): cint {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_parse_video_size(width_ptr, height_ptr: ptr cint; str: cstring): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_small_strptime(p, fmt: cstring; dt: ptr tm) {.importc, cdecl,
    ...raises: [], tags: [], forbids: [].}

proc av_timegm(tm: ptr tm): Time {.importc, cdecl, ...raises: [], tags: [],
                                   forbids: [].}

template av_parse_ratio_quiet(rate, str, max: untyped): untyped