libavcodec/vp8.c:2456: error: Uninitialized Value
  The value read from curframe was never initialized.

libavcodec/vp8.c:2456:5: 
2454.     int ret, i, referenced, num_jobs;
2455.     enum AVDiscard skip_thresh;
2456.     VP8Frame *av_uninit(curframe), *prev_frame;
          ^
2457. 
2458.     if (is_vp7)
