diff --git a/libavcodec/proresdec2.c b/libavcodec/proresdec2.c index 3073880ac207a42d3ab0db8c655183c0dccfbd2a..374c5cb8ad1c669549921f5c4ba5c3b976664c85 100644 --- a/libavcodec/proresdec2.c +++ b/libavcodec/proresdec2.c @@ -591,7 +591,7 @@ static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int qmat_chroma_scaled, log2_chroma_blocks_per_mb); } /* decode alpha plane if available */ - if (ctx->alpha_info && dest_a && a_data_size) + if (ctx->alpha_info && pic->data[3] && a_data_size) decode_slice_alpha(ctx, (uint16_t*)dest_a, luma_stride, buf + y_data_size + u_data_size + v_data_size, a_data_size, slice->mb_count);