libavcodec/utils.c:469: error: Null Dereference
  pointer `desc` last assigned on line 468 could be null and is dereferenced at line 469, column 22.

libavcodec/utils.c:465:1: start of procedure video_get_buffer()
463. }
464. 
465. static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
     ^
466. {
467.     FramePool *pool = s->internal->pool;

libavcodec/utils.c:467:5: 
465. static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
466. {
467.     FramePool *pool = s->internal->pool;
         ^
468.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
469.     int pixel_size = desc->comp[0].step_minus1 + 1;

libavcodec/utils.c:468:5: 
466. {
467.     FramePool *pool = s->internal->pool;
468.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
         ^
469.     int pixel_size = desc->comp[0].step_minus1 + 1;
470.     int h_chroma_shift, v_chroma_shift;

libavutil/pixdesc.c:1504:1: start of procedure av_pix_fmt_desc_get()
  1502. }
  1503. 
  1504. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1505. {
  1506.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1506:9: Taking false branch
  1504. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1505. {
  1506.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1507.         return NULL;
  1508.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1506:24: Taking true branch
  1504. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1505. {
  1506.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1507.         return NULL;
  1508.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1507:9: 
  1505. {
  1506.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1507.         return NULL;
                ^
  1508.     return &av_pix_fmt_descriptors[pix_fmt];
  1509. }

libavutil/pixdesc.c:1509:1: return from a call to av_pix_fmt_desc_get
  1507.         return NULL;
  1508.     return &av_pix_fmt_descriptors[pix_fmt];
  1509. }
        ^
  1510. 
  1511. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:469:5: 
467.     FramePool *pool = s->internal->pool;
468.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
469.     int pixel_size = desc->comp[0].step_minus1 + 1;
         ^
470.     int h_chroma_shift, v_chroma_shift;
471.     int i;
