718     AVFrame* diffFrame;  in apng_encode_frame()  local
737     diffFrame = av_frame_alloc();  in apng_encode_frame()
738     if (!diffFrame)  in apng_encode_frame()
741     diffFrame->format = pict->format;  in apng_encode_frame()
742     diffFrame->width = pict->width;  in apng_encode_frame()
743     diffFrame->height = pict->height;  in apng_encode_frame()
744     if ((ret = av_frame_get_buffer(diffFrame, 0)) < 0)  in apng_encode_frame()
772                 diffFrame->width = pict->width;  in apng_encode_frame()
773                 diffFrame->height = pict->height;  in apng_encode_frame()
774                 ret = av_frame_copy(diffFrame, s->last_frame);  in apng_encode_frame()
780 …                    size_t row_start = diffFrame->linesize[0] * y + bpp * last_fctl_chunk.x_offset;  in apng_encode_frame()
781                         memset(diffFrame->data[0] + row_start, 0, bpp * last_fctl_chunk.width);  in apng_encode_frame()
788                 diffFrame->width = pict->width;  in apng_encode_frame()
789                 diffFrame->height = pict->height;  in apng_encode_frame()
790                 ret = av_frame_copy(diffFrame, s->prev_frame);  in apng_encode_frame()
796             if (apng_do_inverse_blend(diffFrame, pict, &fctl_chunk, bpp) < 0)  in apng_encode_frame()
800             ret = encode_frame(avctx, diffFrame);  in apng_encode_frame()
837     av_frame_free(&diffFrame);  in apng_encode_frame()