libavcodec/mjpegdec.c:882: error: Uninitialized Value
  The value read from data[_] was never initialized.

libavcodec/mjpegdec.c:882:21: 
880.                     if (s->interlaced && s->bottom_field)
881.                         block_offset += linesize[c] >> 1;
882.                     ptr = data[c] + block_offset;
                         ^
883.                     if (!s->progressive) {
884.                         if (copy_mb)
