avconv.c:171: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `avformat_free_context`.

avconv.c:161:9: Call
159.             av_freep(&filtergraphs[i]->outputs[j]);
160.         }
161.         av_freep(&filtergraphs[i]->outputs);
             ^
162.         av_freep(&filtergraphs[i]);
163.     }

libavutil/mem.c:157:5: Assignment
  155.     void **ptr= (void**)arg;
  156.     av_free(*ptr);
  157.     *ptr = NULL;
           ^
  158. }
  159. 

avconv.c:171:9: Call
169.         if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
170.             avio_close(s->pb);
171.         avformat_free_context(s);
             ^
172.         av_dict_free(&output_files[i]->opts);
173.         av_freep(&output_files[i]);

libavformat/utils.c:2623:1: <LHS trace>
2621. }
2622. 
2623. void avformat_free_context(AVFormatContext *s)
      ^
2624. {
2625.     int i;

libavformat/utils.c:2623:1: Parameter `s->nb_programs`
  2621. }
  2622. 
  2623. void avformat_free_context(AVFormatContext *s)
        ^
  2624. {
  2625.     int i;

libavformat/utils.c:2649:9: Binary operation: ([0, +oo] - 1):unsigned32 by call to `avformat_free_context` 
  2647.         av_free(st);
  2648.     }
  2649.     for(i=s->nb_programs-1; i>=0; i--) {
                ^
  2650.         av_dict_free(&s->programs[i]->metadata);
  2651.         av_freep(&s->programs[i]->stream_index);

void avformat_free_context(AVFormatContext *s)
{
    int i;
    AVStream *st;
    av_opt_free(s);
    if (s->iformat && s->iformat->priv_class && s->priv_data)
        av_opt_free(s->priv_data);
    for(i=0;i<s->nb_streams;i++) {
        st = s->streams[i];
        if (st->parser) {
            av_parser_close(st->parser);
        }
        if (st->attached_pic.data)
            av_free_packet(&st->attached_pic);
        av_dict_free(&st->metadata);
        av_free(st->index_entries);
        av_free(st->codec->extradata);
        av_free(st->codec->subtitle_header);
        av_free(st->codec);
        av_free(st->priv_data);
        av_free(st->info);
        av_free(st);
    }
    for(i=s->nb_programs-1; i>=0; i--) {
        av_dict_free(&s->programs[i]->metadata);
        av_freep(&s->programs[i]->stream_index);
        av_freep(&s->programs[i]);
    }
    av_freep(&s->programs);
    av_freep(&s->priv_data);
    while(s->nb_chapters--) {
        av_dict_free(&s->chapters[s->nb_chapters]->metadata);
        av_free(s->chapters[s->nb_chapters]);
    }
    av_freep(&s->chapters);
    av_dict_free(&s->metadata);
    av_freep(&s->streams);
    av_free(s);
}
['static void exit_program()\n{\n    int i, j;\n    for (i = 0; i < nb_filtergraphs; i++) {\n        avfilter_graph_free(&filtergraphs[i]->graph);\n        for (j = 0; j < filtergraphs[i]->nb_inputs; j++) {\n            av_freep(&filtergraphs[i]->inputs[j]->name);\n            av_freep(&filtergraphs[i]->inputs[j]);\n        }\n        av_freep(&filtergraphs[i]->inputs);\n        for (j = 0; j < filtergraphs[i]->nb_outputs; j++) {\n            av_freep(&filtergraphs[i]->outputs[j]->name);\n            av_freep(&filtergraphs[i]->outputs[j]);\n        }\n        av_freep(&filtergraphs[i]->outputs);\n        av_freep(&filtergraphs[i]);\n    }\n    av_freep(&filtergraphs);\n    for (i = 0; i < nb_output_files; i++) {\n        AVFormatContext *s = output_files[i]->ctx;\n        if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)\n            avio_close(s->pb);\n        avformat_free_context(s);\n        av_dict_free(&output_files[i]->opts);\n        av_freep(&output_files[i]);\n    }\n    for (i = 0; i < nb_output_streams; i++) {\n        AVBitStreamFilterContext *bsfc = output_streams[i]->bitstream_filters;\n        while (bsfc) {\n            AVBitStreamFilterContext *next = bsfc->next;\n            av_bitstream_filter_close(bsfc);\n            bsfc = next;\n        }\n        output_streams[i]->bitstream_filters = NULL;\n        avcodec_free_frame(&output_streams[i]->filtered_frame);\n        av_freep(&output_streams[i]->forced_keyframes);\n        av_freep(&output_streams[i]->avfilter);\n        av_freep(&output_streams[i]->logfile_prefix);\n        av_freep(&output_streams[i]);\n    }\n    for (i = 0; i < nb_input_files; i++) {\n        avformat_close_input(&input_files[i]->ctx);\n        av_freep(&input_files[i]);\n    }\n    for (i = 0; i < nb_input_streams; i++) {\n        avcodec_free_frame(&input_streams[i]->decoded_frame);\n        av_dict_free(&input_streams[i]->opts);\n        free_buffer_pool(&input_streams[i]->buffer_pool);\n        av_freep(&input_streams[i]->filters);\n        av_freep(&input_streams[i]);\n    }\n    if (vstats_file)\n        fclose(vstats_file);\n    av_free(vstats_filename);\n    av_freep(&input_streams);\n    av_freep(&input_files);\n    av_freep(&output_streams);\n    av_freep(&output_files);\n    uninit_opts();\n    avfilter_uninit();\n    avformat_network_deinit();\n    if (received_sigterm) {\n        av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\\n",\n               (int) received_sigterm);\n        exit (255);\n    }\n}', 'void av_freep(void *arg)\n{\n    void **ptr= (void**)arg;\n    av_free(*ptr);\n    *ptr = NULL;\n}', 'void avformat_free_context(AVFormatContext *s)\n{\n    int i;\n    AVStream *st;\n    av_opt_free(s);\n    if (s->iformat && s->iformat->priv_class && s->priv_data)\n        av_opt_free(s->priv_data);\n    for(i=0;i<s->nb_streams;i++) {\n        st = s->streams[i];\n        if (st->parser) {\n            av_parser_close(st->parser);\n        }\n        if (st->attached_pic.data)\n            av_free_packet(&st->attached_pic);\n        av_dict_free(&st->metadata);\n        av_free(st->index_entries);\n        av_free(st->codec->extradata);\n        av_free(st->codec->subtitle_header);\n        av_free(st->codec);\n        av_free(st->priv_data);\n        av_free(st->info);\n        av_free(st);\n    }\n    for(i=s->nb_programs-1; i>=0; i--) {\n        av_dict_free(&s->programs[i]->metadata);\n        av_freep(&s->programs[i]->stream_index);\n        av_freep(&s->programs[i]);\n    }\n    av_freep(&s->programs);\n    av_freep(&s->priv_data);\n    while(s->nb_chapters--) {\n        av_dict_free(&s->chapters[s->nb_chapters]->metadata);\n        av_free(s->chapters[s->nb_chapters]);\n    }\n    av_freep(&s->chapters);\n    av_dict_free(&s->metadata);\n    av_freep(&s->streams);\n    av_free(s);\n}']