libavformat/movenc.c:3003: error: Null Dereference
  pointer `pkt.data` last assigned on line 3002 could be null and is dereferenced at line 3003, column 13.

libavformat/movenc.c:2978:1: start of procedure mov_create_chapter_track()
2976. // QuickTime chapters involve an additional text track with the chapter names
2977. // as samples, and a tref pointing from the other tracks to the chapter one.
2978. static void mov_create_chapter_track(AVFormatContext *s, int tracknum)
      ^
2979. {
2980.     MOVMuxContext *mov = s->priv_data;

libavformat/movenc.c:2980:5: 
2978. static void mov_create_chapter_track(AVFormatContext *s, int tracknum)
2979. {
2980.     MOVMuxContext *mov = s->priv_data;
          ^
2981.     MOVTrack *track = &mov->tracks[tracknum];
2982.     AVPacket pkt = { .stream_index = tracknum, .flags = AV_PKT_FLAG_KEY };

libavformat/movenc.c:2981:5: 
2979. {
2980.     MOVMuxContext *mov = s->priv_data;
2981.     MOVTrack *track = &mov->tracks[tracknum];
          ^
2982.     AVPacket pkt = { .stream_index = tracknum, .flags = AV_PKT_FLAG_KEY };
2983.     int i, len;

libavformat/movenc.c:2982:5: 
2980.     MOVMuxContext *mov = s->priv_data;
2981.     MOVTrack *track = &mov->tracks[tracknum];
2982.     AVPacket pkt = { .stream_index = tracknum, .flags = AV_PKT_FLAG_KEY };
          ^
2983.     int i, len;
2984. 

libavformat/movenc.c:2985:5: 
2983.     int i, len;
2984. 
2985.     track->mode = mov->mode;
          ^
2986.     track->tag = MKTAG('t','e','x','t');
2987.     track->timescale = MOV_TIMESCALE;

libavformat/movenc.c:2986:5: 
2984. 
2985.     track->mode = mov->mode;
2986.     track->tag = MKTAG('t','e','x','t');
          ^
2987.     track->timescale = MOV_TIMESCALE;
2988.     track->enc = avcodec_alloc_context3(NULL);

libavformat/movenc.c:2987:5: 
2985.     track->mode = mov->mode;
2986.     track->tag = MKTAG('t','e','x','t');
2987.     track->timescale = MOV_TIMESCALE;
          ^
2988.     track->enc = avcodec_alloc_context3(NULL);
2989.     track->enc->codec_type = AVMEDIA_TYPE_SUBTITLE;

libavformat/movenc.c:2988:5: 
2986.     track->tag = MKTAG('t','e','x','t');
2987.     track->timescale = MOV_TIMESCALE;
2988.     track->enc = avcodec_alloc_context3(NULL);
          ^
2989.     track->enc->codec_type = AVMEDIA_TYPE_SUBTITLE;
2990. 

libavcodec/options.c:123:1: start of procedure avcodec_alloc_context3()
  121. }
  122. 
  123. AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
       ^
  124.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  125. 

libavcodec/options.c:124:5: 
  122. 
  123. AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
  124.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
           ^
  125. 
  126.     if(avctx==NULL) return NULL;

libavutil/mem.c:64:1: start of procedure av_malloc()
    62.    linker will do it automatically. */
    63. 
    64. void *av_malloc(size_t size)
        ^
    65. {
    66.     void *ptr = NULL;

libavutil/mem.c:66:5: 
    64. void *av_malloc(size_t size)
    65. {
    66.     void *ptr = NULL;
            ^
    67. #if CONFIG_MEMALIGN_HACK
    68.     long diff;

libavutil/mem.c:72:8: Taking false branch
    70. 
    71.     /* let's disallow possible ambiguous cases */
    72.     if(size > (INT_MAX-32) )
               ^
    73.         return NULL;
    74. 

libavutil/mem.c:83:9: Taking false branch
    81.     ((char*)ptr)[-1]= diff;
    82. #elif HAVE_POSIX_MEMALIGN
    83.     if (posix_memalign(&ptr,32,size))
                ^
    84.         ptr = NULL;
    85. #elif HAVE_MEMALIGN

libavutil/mem.c:114:5: 
    112.     ptr = malloc(size);
    113. #endif
    114.     return ptr;
             ^
    115. }
    116. 

libavutil/mem.c:115:1: return from a call to av_malloc
    113. #endif
    114.     return ptr;
    115. }
         ^
    116. 
    117. void *av_realloc(void *ptr, size_t size)

libavcodec/options.c:126:8: Taking false branch
  124.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  125. 
  126.     if(avctx==NULL) return NULL;
              ^
  127. 
  128.     if(avcodec_get_context_defaults3(avctx, codec) < 0){

libavcodec/options.c:128:8: Taking false branch
  126.     if(avctx==NULL) return NULL;
  127. 
  128.     if(avcodec_get_context_defaults3(avctx, codec) < 0){
              ^
  129.         av_free(avctx);
  130.         return NULL;

libavcodec/options.c:133:5: 
  131.     }
  132. 
  133.     return avctx;
           ^
  134. }
  135. 

libavcodec/options.c:134:1: return from a call to avcodec_alloc_context3
  132. 
  133.     return avctx;
  134. }
       ^
  135. 
  136. int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)

libavformat/movenc.c:2989:5: 
2987.     track->timescale = MOV_TIMESCALE;
2988.     track->enc = avcodec_alloc_context3(NULL);
2989.     track->enc->codec_type = AVMEDIA_TYPE_SUBTITLE;
          ^
2990. 
2991.     for (i = 0; i < s->nb_chapters; i++) {

libavformat/movenc.c:2991:10: 
2989.     track->enc->codec_type = AVMEDIA_TYPE_SUBTITLE;
2990. 
2991.     for (i = 0; i < s->nb_chapters; i++) {
               ^
2992.         AVChapter *c = s->chapters[i];
2993.         AVDictionaryEntry *t;

libavformat/movenc.c:2991:17: Loop condition is true. Entering loop body
2989.     track->enc->codec_type = AVMEDIA_TYPE_SUBTITLE;
2990. 
2991.     for (i = 0; i < s->nb_chapters; i++) {
                      ^
2992.         AVChapter *c = s->chapters[i];
2993.         AVDictionaryEntry *t;

libavformat/movenc.c:2992:9: 
2990. 
2991.     for (i = 0; i < s->nb_chapters; i++) {
2992.         AVChapter *c = s->chapters[i];
              ^
2993.         AVDictionaryEntry *t;
2994. 

libavformat/movenc.c:2995:9: 
2993.         AVDictionaryEntry *t;
2994. 
2995.         int64_t end = av_rescale_q(c->end, c->time_base, (AVRational){1,MOV_TIMESCALE});
              ^
2996.         pkt.pts = pkt.dts = av_rescale_q(c->start, c->time_base, (AVRational){1,MOV_TIMESCALE});
2997.         pkt.duration = end - pkt.dts;

libavutil/mathematics.c:141:1: start of procedure av_rescale_q()
  139. }
  140. 
  141. int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
       ^
  142. {
  143.     return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF);

libavutil/mathematics.c:143:5: 
  141. int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
  142. {
  143.     return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF);
           ^
  144. }
  145. 

libavutil/mathematics.c:133:1: start of procedure av_rescale_q_rnd()
    131. }
    132. 
    133. int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq,
         ^
    134.                          enum AVRounding rnd)
    135. {

libavutil/mathematics.c:136:5: 
    134.                          enum AVRounding rnd)
    135. {
    136.     int64_t b= bq.num * (int64_t)cq.den;
             ^
    137.     int64_t c= cq.num * (int64_t)bq.den;
    138.     return av_rescale_rnd(a, b, c, rnd);

libavutil/mathematics.c:137:5: 
    135. {
    136.     int64_t b= bq.num * (int64_t)cq.den;
    137.     int64_t c= cq.num * (int64_t)bq.den;
             ^
    138.     return av_rescale_rnd(a, b, c, rnd);
    139. }

libavutil/mathematics.c:138:5: Skipping av_rescale_rnd(): empty list of specs
    136.     int64_t b= bq.num * (int64_t)cq.den;
    137.     int64_t c= cq.num * (int64_t)bq.den;
    138.     return av_rescale_rnd(a, b, c, rnd);
             ^
    139. }
    140. 

libavutil/mathematics.c:139:1: return from a call to av_rescale_q_rnd
    137.     int64_t c= cq.num * (int64_t)bq.den;
    138.     return av_rescale_rnd(a, b, c, rnd);
    139. }
         ^
    140. 
    141. int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)

libavutil/mathematics.c:144:1: return from a call to av_rescale_q
  142. {
  143.     return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF);
  144. }
       ^
  145. 
  146. int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b){

libavformat/movenc.c:2996:9: 
2994. 
2995.         int64_t end = av_rescale_q(c->end, c->time_base, (AVRational){1,MOV_TIMESCALE});
2996.         pkt.pts = pkt.dts = av_rescale_q(c->start, c->time_base, (AVRational){1,MOV_TIMESCALE});
              ^
2997.         pkt.duration = end - pkt.dts;
2998. 

libavutil/mathematics.c:141:1: start of procedure av_rescale_q()
  139. }
  140. 
  141. int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
       ^
  142. {
  143.     return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF);

libavutil/mathematics.c:143:5: 
  141. int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
  142. {
  143.     return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF);
           ^
  144. }
  145. 

libavutil/mathematics.c:133:1: start of procedure av_rescale_q_rnd()
    131. }
    132. 
    133. int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq,
         ^
    134.                          enum AVRounding rnd)
    135. {

libavutil/mathematics.c:136:5: 
    134.                          enum AVRounding rnd)
    135. {
    136.     int64_t b= bq.num * (int64_t)cq.den;
             ^
    137.     int64_t c= cq.num * (int64_t)bq.den;
    138.     return av_rescale_rnd(a, b, c, rnd);

libavutil/mathematics.c:137:5: 
    135. {
    136.     int64_t b= bq.num * (int64_t)cq.den;
    137.     int64_t c= cq.num * (int64_t)bq.den;
             ^
    138.     return av_rescale_rnd(a, b, c, rnd);
    139. }

libavutil/mathematics.c:138:5: Skipping av_rescale_rnd(): empty list of specs
    136.     int64_t b= bq.num * (int64_t)cq.den;
    137.     int64_t c= cq.num * (int64_t)bq.den;
    138.     return av_rescale_rnd(a, b, c, rnd);
             ^
    139. }
    140. 

libavutil/mathematics.c:139:1: return from a call to av_rescale_q_rnd
    137.     int64_t c= cq.num * (int64_t)bq.den;
    138.     return av_rescale_rnd(a, b, c, rnd);
    139. }
         ^
    140. 
    141. int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)

libavutil/mathematics.c:144:1: return from a call to av_rescale_q
  142. {
  143.     return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF);
  144. }
       ^
  145. 
  146. int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b){

libavformat/movenc.c:2997:9: 
2995.         int64_t end = av_rescale_q(c->end, c->time_base, (AVRational){1,MOV_TIMESCALE});
2996.         pkt.pts = pkt.dts = av_rescale_q(c->start, c->time_base, (AVRational){1,MOV_TIMESCALE});
2997.         pkt.duration = end - pkt.dts;
              ^
2998. 
2999.         if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {

libavformat/movenc.c:2999:14: Taking true branch
2997.         pkt.duration = end - pkt.dts;
2998. 
2999.         if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
                   ^
3000.             len = strlen(t->value);
3001.             pkt.size = len+2;

libavformat/movenc.c:3000:13: 
2998. 
2999.         if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
3000.             len = strlen(t->value);
                  ^
3001.             pkt.size = len+2;
3002.             pkt.data = av_malloc(pkt.size);

libavformat/movenc.c:3001:13: 
2999.         if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
3000.             len = strlen(t->value);
3001.             pkt.size = len+2;
                  ^
3002.             pkt.data = av_malloc(pkt.size);
3003.             AV_WB16(pkt.data, len);

libavformat/movenc.c:3002:13: 
3000.             len = strlen(t->value);
3001.             pkt.size = len+2;
3002.             pkt.data = av_malloc(pkt.size);
                  ^
3003.             AV_WB16(pkt.data, len);
3004.             memcpy(pkt.data+2, t->value, len);

libavutil/mem.c:64:1: start of procedure av_malloc()
  62.    linker will do it automatically. */
  63. 
  64. void *av_malloc(size_t size)
      ^
  65. {
  66.     void *ptr = NULL;

libavutil/mem.c:66:5: 
  64. void *av_malloc(size_t size)
  65. {
  66.     void *ptr = NULL;
          ^
  67. #if CONFIG_MEMALIGN_HACK
  68.     long diff;

libavutil/mem.c:72:8: Taking true branch
  70. 
  71.     /* let's disallow possible ambiguous cases */
  72.     if(size > (INT_MAX-32) )
             ^
  73.         return NULL;
  74. 

libavutil/mem.c:73:9: 
  71.     /* let's disallow possible ambiguous cases */
  72.     if(size > (INT_MAX-32) )
  73.         return NULL;
              ^
  74. 
  75. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:115:1: return from a call to av_malloc
  113. #endif
  114.     return ptr;
  115. }
       ^
  116. 
  117. void *av_realloc(void *ptr, size_t size)

libavformat/movenc.c:3003:13: 
3001.             pkt.size = len+2;
3002.             pkt.data = av_malloc(pkt.size);
3003.             AV_WB16(pkt.data, len);
                  ^
3004.             memcpy(pkt.data+2, t->value, len);
3005.             ff_mov_write_packet(s, &pkt);

libavutil/bswap.h:58:1: start of procedure av_bswap16()
  56. 
  57. #ifndef av_bswap16
  58. static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
      ^
  59. {
  60.     x= (x>>8) | (x<<8);

libavutil/bswap.h:60:5: 
  58. static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
  59. {
  60.     x= (x>>8) | (x<<8);
          ^
  61.     return x;
  62. }

libavutil/bswap.h:61:5: 
  59. {
  60.     x= (x>>8) | (x<<8);
  61.     return x;
          ^
  62. }
  63. #endif

libavutil/bswap.h:62:1: return from a call to av_bswap16
  60.     x= (x>>8) | (x<<8);
  61.     return x;
  62. }
      ^
  63. #endif
  64. 
