libavcodec/utils.c:476: error: Null Dereference
  pointer `desc` last assigned on line 475 could be null and is dereferenced at line 476, column 22.

libavcodec/utils.c:472:1: start of procedure video_get_buffer()
470. }
471. 
472. static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
     ^
473. {
474.     FramePool *pool = s->internal->pool;

libavcodec/utils.c:474:5: 
472. static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
473. {
474.     FramePool *pool = s->internal->pool;
         ^
475.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
476.     int pixel_size = desc->comp[0].step_minus1 + 1;

libavcodec/utils.c:475:5: 
473. {
474.     FramePool *pool = s->internal->pool;
475.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
         ^
476.     int pixel_size = desc->comp[0].step_minus1 + 1;
477.     int h_chroma_shift, v_chroma_shift;

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:476:5: 
474.     FramePool *pool = s->internal->pool;
475.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
476.     int pixel_size = desc->comp[0].step_minus1 + 1;
         ^
477.     int h_chroma_shift, v_chroma_shift;
478.     int i;
