libavcodec/utils.c:449: error: Null Dereference
  pointer `desc` last assigned on line 448 could be null and is dereferenced at line 449, column 22.

libavcodec/utils.c:445:1: start of procedure video_get_buffer()
443. }
444. 
445. static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
     ^
446. {
447.     FramePool *pool = s->internal->pool;

libavcodec/utils.c:447:5: 
445. static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
446. {
447.     FramePool *pool = s->internal->pool;
         ^
448.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
449.     int pixel_size = desc->comp[0].step_minus1 + 1;

libavcodec/utils.c:448:5: 
446. {
447.     FramePool *pool = s->internal->pool;
448.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
         ^
449.     int pixel_size = desc->comp[0].step_minus1 + 1;
450.     int h_chroma_shift, v_chroma_shift;

libavutil/pixdesc.c:1507:1: start of procedure av_pix_fmt_desc_get()
  1505. }
  1506. 
  1507. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1508. {
  1509.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1509:9: Taking false branch
  1507. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1508. {
  1509.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1510.         return NULL;
  1511.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1509:24: Taking true branch
  1507. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1508. {
  1509.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1510.         return NULL;
  1511.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1510:9: 
  1508. {
  1509.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1510.         return NULL;
                ^
  1511.     return &av_pix_fmt_descriptors[pix_fmt];
  1512. }

libavutil/pixdesc.c:1512:1: return from a call to av_pix_fmt_desc_get
  1510.         return NULL;
  1511.     return &av_pix_fmt_descriptors[pix_fmt];
  1512. }
        ^
  1513. 
  1514. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:449:5: 
447.     FramePool *pool = s->internal->pool;
448.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
449.     int pixel_size = desc->comp[0].step_minus1 + 1;
         ^
450.     int h_chroma_shift, v_chroma_shift;
451.     int i;
