Prevents dangling pointers and makes access after free more obvious.
Setting AVFrame.qscale_table to NULL is required for successfully
allocating a previously freed Picture with ff_alloc_picture().
av_freep(&pic->mb_mean);
av_freep(&pic->f.mbskip_table);
av_freep(&pic->qscale_table_base);
+ pic->f.qscale_table = NULL;
av_freep(&pic->mb_type_base);
+ pic->f.mb_type = NULL;
av_freep(&pic->f.dct_coeff);
av_freep(&pic->f.pan_scan);
pic->f.mb_type = NULL;
for (i = 0; i < 2; i++) {
av_freep(&pic->motion_val_base[i]);
av_freep(&pic->f.ref_index[i]);
+ pic->f.motion_val[i] = NULL;
}
if (pic->f.type == FF_BUFFER_TYPE_SHARED) {