avconv.c:828: error: Uninitialized Value
  The value read from in_filter was never initialized.

avconv.c:828:9: 
826. 
827.         outputs->name    = av_strdup("in");
828.         outputs->filter_ctx = in_filter;
             ^
829.         outputs->pad_idx = 0;
830.         outputs->next    = NULL;

static int configure_simple_filtergraph(FilterGraph *fg)
{
    OutputStream *ost = fg->outputs[0]->ost;
    AVFilterContext *in_filter, *out_filter;
    int ret;
    avfilter_graph_free(&fg->graph);
    fg->graph = avfilter_graph_alloc();
    switch (ost->st->codec->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        ret = configure_video_filters(fg, &in_filter, &out_filter);
        break;
    case AVMEDIA_TYPE_AUDIO:
        ret = configure_audio_filters(fg, &in_filter, &out_filter);
        break;
    default: av_assert0(0);
    }
    if (ret < 0)
        return ret;
    if (ost->avfilter) {
        AVFilterInOut *outputs = avfilter_inout_alloc();
        AVFilterInOut *inputs  = avfilter_inout_alloc();
        outputs->name    = av_strdup("in");
        outputs->filter_ctx = in_filter;
        outputs->pad_idx = 0;
        outputs->next    = NULL;
        inputs->name    = av_strdup("out");
        inputs->filter_ctx = out_filter;
        inputs->pad_idx = 0;
        inputs->next    = NULL;
        if ((ret = avfilter_graph_parse(fg->graph, ost->avfilter, inputs, outputs, NULL)) < 0)
            return ret;
    } else {
        if ((ret = avfilter_link(in_filter, 0, out_filter, 0)) < 0)
            return ret;
    }
    if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
        return ret;
    ost->filter = fg->outputs[0];
    return 0;
}
['static int configure_simple_filtergraph(FilterGraph *fg)\n{\n    OutputStream *ost = fg->outputs[0]->ost;\n    AVFilterContext *in_filter, *out_filter;\n    int ret;\n    avfilter_graph_free(&fg->graph);\n    fg->graph = avfilter_graph_alloc();\n    switch (ost->st->codec->codec_type) {\n    case AVMEDIA_TYPE_VIDEO:\n        ret = configure_video_filters(fg, &in_filter, &out_filter);\n        break;\n    case AVMEDIA_TYPE_AUDIO:\n        ret = configure_audio_filters(fg, &in_filter, &out_filter);\n        break;\n    default: av_assert0(0);\n    }\n    if (ret < 0)\n        return ret;\n    if (ost->avfilter) {\n        AVFilterInOut *outputs = avfilter_inout_alloc();\n        AVFilterInOut *inputs  = avfilter_inout_alloc();\n        outputs->name    = av_strdup("in");\n        outputs->filter_ctx = in_filter;\n        outputs->pad_idx = 0;\n        outputs->next    = NULL;\n        inputs->name    = av_strdup("out");\n        inputs->filter_ctx = out_filter;\n        inputs->pad_idx = 0;\n        inputs->next    = NULL;\n        if ((ret = avfilter_graph_parse(fg->graph, ost->avfilter, inputs, outputs, NULL)) < 0)\n            return ret;\n    } else {\n        if ((ret = avfilter_link(in_filter, 0, out_filter, 0)) < 0)\n            return ret;\n    }\n    if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)\n        return ret;\n    ost->filter = fg->outputs[0];\n    return 0;\n}']