On Sun, Sep 04, 2011 at 11:23:34 (CEST), Elimar Riesebieter wrote: > * Reinhard Tartler [110904 08:47 +0200]: > >> tags 638250 help >> stop >> >> On Sun, Sep 04, 2011 at 06:45:36 (CEST), Elimar Riesebieter wrote: >> >> > block 638250 by 639948 >> > thanks >> >> I strongly disagree that this arch specific defect on ppc is in any way >> a blocking bug for recompiling moc-ffmpeg-plugin against the new libav >> libraries. > > moc-ffmpeg-plugin on ppc compiles well against libav 0.7.1 libraries > but produces exactly the same backtraces as ffplay 0.7.1 on ppc. So > this is surely a libav bug.
Nobody doubts that. My objection in that the 'block' relationship is wrong. As soon as a change for the altivec assembler code is found, surely moc-ffmpeg-plugin will work again. >> It only affects (some?) altivec enabled machines and can be >> easily avoided by disabling the altivec variant. > > What do you mean with only? PPC is an officialy supported > architecture in Debian! I mean that we know that the bug appears on your particular machine. I question that it might not be broken on *every* altivec machine available. The code in question has passed an intensive regression suite, which includes testing on altivec machines. I'm curious how this could slip through: http://fate.libav.org/ > Most of the powerpc machines are altivev capable. Apple's G4 and G5, > IBM's Power6 and Power7 are all have altivec which is very useful to > accelerate multimedia applications. And please notice, that altivec > was working well on ffmpeg 0.6.2-5 so it turns out that #639948 is a > regression! Again, nobody doubts that. I just don't consider #639948 release critical. >> [...] >> >> > Thanks again for the patch but there is no solution for #639948 yet. >> > Please advice me what to do? I filed the ppc bug to libav-upstream >> > http://bugzilla.libav.org/show_bug.cgi?id=40 but there is no >> > response either from Debian-multimedia. Removing ppc from supported >> > archs isn't practicable as 639948 is a regression. >> >> Ideally, we find a porter that can identify the bug and provide a patch >> for fixing the segmentation fault. I've copied the powerpc porters and >> ask them hereby for their assistance. > > I'll check the CC settings in libav package, but as far as I can see > they are equal for ppc. Hmmm. Compiling ith gcc-4.5 would be a first > attempt to eleminate a compiler bug. Thanks. >> Or, if porters approached me, I also could disable the altivec builds in >> libav completely, penalizing potential altivec users that do not >> experience this issue. > > This might not be a very intelligent solution. Well, I just state the available options. -- Gruesse/greetings, Reinhard Tartler, KeyID 945348A4 -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
