libavcodec/utils.c:280: error: Null Dereference
  pointer `desc` last assigned on line 279 could be null and is dereferenced at line 280, column 24.

libavcodec/utils.c:277:1: start of procedure avcodec_align_dimensions()
275. }
276. 
277. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
278. {
279.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:279:5: 
277. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
278. {
279.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
280.     int chroma_shift = desc->log2_chroma_w;
281.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1570:1: start of procedure av_pix_fmt_desc_get()
  1568. }
  1569. 
  1570. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1571. {
  1572.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1572:9: Taking false branch
  1570. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1571. {
  1572.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1573.         return NULL;
  1574.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1572:24: Taking true branch
  1570. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1571. {
  1572.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1573.         return NULL;
  1574.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1573:9: 
  1571. {
  1572.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1573.         return NULL;
                ^
  1574.     return &av_pix_fmt_descriptors[pix_fmt];
  1575. }

libavutil/pixdesc.c:1575:1: return from a call to av_pix_fmt_desc_get
  1573.         return NULL;
  1574.     return &av_pix_fmt_descriptors[pix_fmt];
  1575. }
        ^
  1576. 
  1577. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:280:5: 
278. {
279.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
280.     int chroma_shift = desc->log2_chroma_w;
         ^
281.     int linesize_align[AV_NUM_DATA_POINTERS];
282.     int align;
