libavcodec/libvpxdec.c:100:57: warning: passing argument 3 of 'av_image_copy' from incompatible pointer type
         av_image_copy(picture->data, picture->linesize, img->planes,
libavutil/imgutils.h:116:6: note: expected 'const uint8_t **' but argument is of type 'unsigned char **'
 void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],