On Fri, Oct 18, 2019 at 08:24:21PM +0200, Michael Niedermayer wrote: > On Fri, Oct 18, 2019 at 03:09:48AM +0200, Lynne wrote: > > Oct 17, 2019, 23:25 by mich...@niedermayer.cc: > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavcodec/ffv1.h | 1 + > > libavcodec/ffv1dec.c | 10 +++++++--- > > libavcodec/ffv1enc.c | 10 +++++++--- > > 3 files changed, 15 insertions(+), 6 deletions(-) > > > > Why 0x4964AF46 instead of 0xFFFFFFFF? > > CRC32 of 0x4964AF46 is 0xFFFFFFFF > > its effect is just to apply a 0xFFFFFFFF flip where its needed on the decoder > side > > This is the result of building a block [data] + [32bit checksum] which as a > whole has a CRC of 0. > So the code can be made simpler on the decoder side, the checksum no longer > represents a special case and if you want to apply error correction also > the checksum is not a special case > > If theres a more beautifull way to achive the same then iam certainly > interrested in that
will apply all patches of this set except this. I intend to apply this one when the specification is updated thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Dictatorship: All citizens are under surveillance, all their steps and actions recorded, for the politicians to enforce control. Democracy: All politicians are under surveillance, all their steps and actions recorded, for the citizens to enforce control.
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