libavcodec/utils.c:262: error: Null Dereference
  pointer `desc` last assigned on line 261 could be null and is dereferenced at line 262, column 24.

libavcodec/utils.c:259:1: start of procedure avcodec_align_dimensions()
257. }
258. 
259. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
260. {
261.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:261:5: 
259. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
260. {
261.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
262.     int chroma_shift = desc->log2_chroma_w;
263.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1466:1: start of procedure av_pix_fmt_desc_get()
  1464. }
  1465. 
  1466. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1467. {
  1468.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1468:9: Taking false branch
  1466. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1467. {
  1468.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1469.         return NULL;
  1470.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1468:24: Taking true branch
  1466. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1467. {
  1468.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1469.         return NULL;
  1470.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1469:9: 
  1467. {
  1468.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1469.         return NULL;
                ^
  1470.     return &av_pix_fmt_descriptors[pix_fmt];
  1471. }

libavutil/pixdesc.c:1471:1: return from a call to av_pix_fmt_desc_get
  1469.         return NULL;
  1470.     return &av_pix_fmt_descriptors[pix_fmt];
  1471. }
        ^
  1472. 
  1473. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:262:5: 
260. {
261.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
262.     int chroma_shift = desc->log2_chroma_w;
         ^
263.     int linesize_align[AV_NUM_DATA_POINTERS];
264.     int align;
