proc av_buffersrc_add_frame(ctx: ptr AVFilterContext; frame: ptr AVFrame): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_buffersrc_add_frame_flags(buffer_src: ptr AVFilterContext;
                                  frame: ptr AVFrame; flags: cint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_buffersrc_close(ctx: ptr AVFilterContext; pts: int64; flags: cuint): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_buffersrc_get_nb_failed_requests(buffer_src: ptr AVFilterContext): cuint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

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

proc av_buffersrc_parameters_set(ctx: ptr AVFilterContext;
                                 param: ptr AVBufferSrcParameters): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_buffersrc_write_frame(ctx: ptr AVFilterContext; frame: ptr AVFrame): cint {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}