- (kxMovieError) openInput: (NSString *) path
{
    AVFormatContext *formatCtx = NULL;

    if (_interruptCallback) {

        formatCtx = avformat_alloc_context();
        if (!formatCtx)
            return kxMovieErrorOpenFile;

        AVIOInterruptCB cb = {interrupt_callback, (__bridge void *)(self)};
        formatCtx->interrupt_callback = cb;
    }

    if (avformat_open_input(&formatCtx, [path cStringUsingEncoding: NSUTF8StringEncoding], NULL, NULL) < 0) {

        if (formatCtx)
            avformat_free_context(formatCtx);
        return kxMovieErrorOpenFile;
    }

    if (avformat_find_stream_info(formatCtx, NULL) < 0) {

        avformat_close_input(&formatCtx);
        return kxMovieErrorStreamInfoNotFound;
    }

    av_dump_format(formatCtx, 0, [path.lastPathComponent cStringUsingEncoding: NSUTF8StringEncoding], false);

    _formatCtx = formatCtx;
    return kxMovieErrorNone;
}