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--- a/ivfh264.c

+++ b/ivfh264.c

@@ -754,7 +754,7 @@

 		if(v.nal_unit_type == 8){ /* have sps+pps */

 			s = smprint(

-				"decode h264\n"

+				"decode h.264\n"

 				"sps pic_height_in_map_units_minus1 %d\n"

 				"sps pic_width_in_mbs_minus1 %d\n"

 				"sps chroma_format_idc %d\n"

@@ -807,7 +807,7 @@

 				v.pps.pic_parameter_set_id

 			);

 			if(pwrite(vpu, s, strlen(s), 0) < 0)

-				sysfatal("%r");

+				sysfatal("sps+pps: %r");

 			free(s);

 			shgo = 1;

 		}else if(shgo){

@@ -836,11 +836,16 @@

 				v.sh.bottom_field_flag

 			);

 			if(pwrite(vpu, s, strlen(s), 0) < 0)

-				sysfatal("%r");

+				sysfatal("sh: %r");

 			Bseek(&in, off, 0);

 			Bread(&in, buf, sz);

-			pwrite(vpu, buf, sz, -1);

-			pread(vpu, buf, 0, 0);

+			if(pwrite(vpu, buf, sz, 1) < 0)

+				sysfatal("data: %r");

+			if(pread(vpu, buf, 0, 0) < 0){

+				sleep(1000);

+				sysfatal("read: %r");

+			}

+			sleep(1000);

 		}

 		Bseek(&in, off+sz, 0);