libavformat/segment.c:371: error: Integer Overflow L1
  ([-oo, 0] - 1):unsigned32 by call to `avformat_free_context`.

libavformat/segment.c:351:20: Call
349. 
350.     if (!seg->write_header_trailer) {
351.         if ((ret = segment_end(oc, 0)) < 0)
                        ^
352.             goto fail;
353.         if ((ret = open_null_ctx(&oc->pb)) < 0)

libavformat/segment.c:167:9: Call
  165.     av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
  166.     if (write_trailer)
  167.         av_write_trailer(oc);
               ^
  168.     ff_format_io_close(oc, &oc->pb);
  169. 

libavformat/mux.c:698:9: Call
    696. fail:
    697.     for (i = 0; i < s->nb_streams; i++) {
    698.         av_freep(&s->streams[i]->priv_data);
                 ^
    699.         av_freep(&s->streams[i]->index_entries);
    700.     }

libavutil/mem.c:207:26: Assignment
      205. 
      206.     memcpy(&val, arg, sizeof(val));
      207.     memcpy(arg, &(void *){ NULL }, sizeof(val));
                                    ^
      208.     av_free(val);
      209. }

libavformat/segment.c:371:5: Call
369. fail:
370.     ff_format_io_close(s, &seg->pb);
371.     avformat_free_context(oc);
         ^
372.     return ret;
373. }

libavformat/utils.c:2477:1: <LHS trace>
2475. }
2476. 
2477. void avformat_free_context(AVFormatContext *s)
      ^
2478. {
2479.     int i;

libavformat/utils.c:2477:1: Parameter `s->nb_chapters`
  2475. }
  2476. 
  2477. void avformat_free_context(AVFormatContext *s)
        ^
  2478. {
  2479.     int i;

libavformat/utils.c:2498:12: Binary operation: ([-oo, 0] - 1):unsigned32 by call to `avformat_free_context` 
  2496.     av_freep(&s->programs);
  2497.     av_freep(&s->priv_data);
  2498.     while (s->nb_chapters--) {
                   ^
  2499.         av_dict_free(&s->chapters[s->nb_chapters]->metadata);
  2500.         av_free(s->chapters[s->nb_chapters]);

void avformat_free_context(AVFormatContext *s)
{
    int i;
    if (!s)
        return;
    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++)
        free_stream(&s->streams[i]);
    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_freep(&s->internal);
    av_free(s);
}
['static int seg_write_trailer(struct AVFormatContext *s)\n{\n    SegmentContext *seg = s->priv_data;\n    AVFormatContext *oc = seg->avf;\n    int ret = 0;\n    if (!oc)\n        goto fail;\n    if (!seg->write_header_trailer) {\n        if ((ret = segment_end(oc, 0)) < 0)\n            goto fail;\n        if ((ret = open_null_ctx(&oc->pb)) < 0)\n            goto fail;\n        ret = av_write_trailer(oc);\n        close_null_ctx(oc->pb);\n    } else {\n        ret = segment_end(oc, 1);\n    }\n    if (ret < 0)\n        goto fail;\n    if (seg->list && seg->list_type == LIST_HLS) {\n        if ((ret = segment_hls_window(s, 1) < 0))\n            goto fail;\n    }\nfail:\n    ff_format_io_close(s, &seg->pb);\n    avformat_free_context(oc);\n    return ret;\n}', 'static int segment_end(AVFormatContext *oc, int write_trailer)\n{\n    int ret = 0;\n    av_write_frame(oc, NULL);\n    if (write_trailer)\n        av_write_trailer(oc);\n    ff_format_io_close(oc, &oc->pb);\n    return ret;\n}', 'int av_write_trailer(AVFormatContext *s)\n{\n    int ret, i;\n    for (;; ) {\n        AVPacket pkt;\n        ret = interleave_packet(s, &pkt, NULL, 1);\n        if (ret < 0)\n            goto fail;\n        if (!ret)\n            break;\n        ret = write_packet(s, &pkt);\n        if (ret >= 0)\n            s->streams[pkt.stream_index]->nb_frames++;\n        av_packet_unref(&pkt);\n        if (ret < 0)\n            goto fail;\n    }\n    if (s->oformat->write_trailer)\n        ret = s->oformat->write_trailer(s);\n    if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)\n        avio_flush(s->pb);\nfail:\n    for (i = 0; i < s->nb_streams; i++) {\n        av_freep(&s->streams[i]->priv_data);\n        av_freep(&s->streams[i]->index_entries);\n    }\n    if (s->oformat->priv_class)\n        av_opt_free(s->priv_data);\n    av_freep(&s->priv_data);\n    return ret;\n}', 'void av_freep(void *arg)\n{\n    void *val;\n    memcpy(&val, arg, sizeof(val));\n    memcpy(arg, &(void *){ NULL }, sizeof(val));\n    av_free(val);\n}', 'void avformat_free_context(AVFormatContext *s)\n{\n    int i;\n    if (!s)\n        return;\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        free_stream(&s->streams[i]);\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_freep(&s->internal);\n    av_free(s);\n}']