https://community.intel.com/t5/Intel-Integrated-Performance/valgrind-error-in-MPEG4-encoder/m-p/912331#M14388 <P>Hi!</P> <P>I am building a live transcoder using Intel IPP. It works pretty well, but when I run it with valgrind, I get some errorsand they all seem to relate to one particular subject. In summary the error report contains:</P> <P><FONT color="#000000" size="2">Conditional jump or move depends on uninitialised value(s) at w7_ippiQuantIntra_MPEG4_16s_C1I </FONT></P> <P><FONT color="#000000" size="2">Conditional jump or move depends on uninitialised value(s)at ippVideoEncoderMPEG4::TransMacroBlockIntra_MPEG4(unsigned char*, unsigned char*, unsigned char*, short*, int*, int, int, int, int*)by ippVideoEncoderMPEG4::EncodeIVOP() (ippvideoencodermpeg4_vop.cpp)</FONT></P> <P>As far as I can see it, valgrind signals that coeffMB is unitialized, but using a memset on it does not remove the error. Removing the __ALIGN part of__ALIGN16(Ipp16s, coeffMB, 64*6); in EncodeIVOP() also does not change anything.</P> <P>It seems that ippiDCT8x8Fwd_8u16s_C1R or ippiQuantIntra_MPEG4_16s_C1I in TransMacroBlockIntra_MPEG4 do something with coeffMB (such that valgrind thinks the data is unitialized again) but since the IPP libraries are not built with debugging symbols and I do not have the source of IPP, I cannotlook into this code.</P> <P>It could be the case that valgrind (latestrelease 3.2.0)cannot handle this code, but when somebody knows more about this, please let me know.</P> <P>Greetings Werner.</P> <P>I do not get any memory leak errors, so that is ok :D.</P> Wed, 06 Sep 2006 18:34:47 GMT dierssen 2006-09-06T18:34:47Z https://community.intel.com/t5/Intel-Integrated-Performance/valgrind-error-in-MPEG4-encoder/m-p/912331#M14388 <P>Hi!</P> <P>I am building a live transcoder using Intel IPP. It works pretty well, but when I run it with valgrind, I get some errorsand they all seem to relate to one particular subject. In summary the error report contains:</P> <P><FONT color="#000000" size="2">Conditional jump or move depends on uninitialised value(s) at w7_ippiQuantIntra_MPEG4_16s_C1I </FONT></P> <P><FONT color="#000000" size="2">Conditional jump or move depends on uninitialised value(s)at ippVideoEncoderMPEG4::TransMacroBlockIntra_MPEG4(unsigned char*, unsigned char*, unsigned char*, short*, int*, int, int, int, int*)by ippVideoEncoderMPEG4::EncodeIVOP() (ippvideoencodermpeg4_vop.cpp)</FONT></P> <P>As far as I can see it, valgrind signals that coeffMB is unitialized, but using a memset on it does not remove the error. Removing the __ALIGN part of__ALIGN16(Ipp16s, coeffMB, 64*6); in EncodeIVOP() also does not change anything.</P> <P>It seems that ippiDCT8x8Fwd_8u16s_C1R or ippiQuantIntra_MPEG4_16s_C1I in TransMacroBlockIntra_MPEG4 do something with coeffMB (such that valgrind thinks the data is unitialized again) but since the IPP libraries are not built with debugging symbols and I do not have the source of IPP, I cannotlook into this code.</P> <P>It could be the case that valgrind (latestrelease 3.2.0)cannot handle this code, but when somebody knows more about this, please let me know.</P> <P>Greetings Werner.</P> <P>I do not get any memory leak errors, so that is ok :D.</P> Wed, 06 Sep 2006 18:34:47 GMT https://community.intel.com/t5/Intel-Integrated-Performance/valgrind-error-in-MPEG4-encoder/m-p/912331#M14388 dierssen 2006-09-06T18:34:47Z https://community.intel.com/t5/Intel-Integrated-Performance/valgrind-error-in-MPEG4-encoder/m-p/912332#M14389 <P>Hello, thank you for your report. It seems that valgrind just do not handle all the things correctly. Did you try to check the code with some other tools?</P> <P>Regards,<BR /> Vladimir</P> Fri, 15 Sep 2006 03:46:37 GMT https://community.intel.com/t5/Intel-Integrated-Performance/valgrind-error-in-MPEG4-encoder/m-p/912332#M14389 Vladimir_Dudnik 2006-09-15T03:46:37Z https://community.intel.com/t5/Intel-Integrated-Performance/valgrind-error-in-MPEG4-encoder/m-p/912333#M14390 <P>Well, probably you are right. The error does not give me any problems, but I just wanted to check if there were more people with the same valgrind error :).</P> Mon, 18 Sep 2006 22:09:42 GMT https://community.intel.com/t5/Intel-Integrated-Performance/valgrind-error-in-MPEG4-encoder/m-p/912333#M14390 dierssen 2006-09-18T22:09:42Z