libavcodec/mjpegdec.c:885: error: Uninitialized Value
  The value read from linesize[_] was never initialized.

libavcodec/mjpegdec.c:885:29: 
883.                     if (!s->progressive) {
884.                         if (copy_mb)
885.                             mjpeg_copy_block(ptr, reference_data[c] + block_offset,
                                 ^
886.                                              linesize[c], s->avctx->lowres);
887.                         else {
