Opened 10 years ago

Closed 10 years ago

#172 closed defect (fixed)

HM3.1 SAO and multiple SPS/PPS

Reported by: thomasd Owned by:
Priority: minor Milestone:
Component: HM Version:
Keywords: SAO SPS PPS Cc: fbossen, ksuehring, davidf, jct-vc@…

Description

In HM3.1, if TEncGOP.cpp is modified to code a PPS and SPS with every frame, by commenting out the guard by m_bSeqFirst at line 427, then the decoder will decode but reports MD5 mismatches.

When SAO is turned off, these MD5 mismatches disappear.

Running the decoder with valgrind returns the error:

==16136== Conditional jump or move depends on uninitialised value(s)
==16136== at 0x41697A: TComSampleAdaptiveOffset::xProcessQuadTreeAo(unsigned int, TComPicYuv*, TComPicYuv*) (TComAdaptiveLoopFilter.cpp:3443)
==16136== by 0x4184CA: TComSampleAdaptiveOffset::SAOProcess(TComPic*, _SaoParam*) (TComAdaptiveLoopFilter.cpp:3523)
==16136== by 0x46F2AC: TDecGop::decompressGop(TComInputBitstream*, TComPic*&, bool) (TDecGop.cpp:189)
==16136== by 0x477A68: TDecTop::executeDeblockAndAlf(unsigned int&, TComList<TComPic*>*&, int&, int&) (TDecTop.cpp:196)
==16136== by 0x40666C: TAppDecTop::decode() (TAppDecTop.cpp:139)
==16136== by 0x4036A7: main (decmain.cpp:76)

An example command line is :
./hm-enc -c encoder_intra_loco.cfg -c racehorses-c.cfg -i /master/hevc-test-pictures/RaceHorses_832x480_30.yuv -o test.yuv -b test.bit --FramesToBeEncoded=9 [--SAO=0]

The output of the decoder is still viewable and differs only by small values from the encoder local output, suggesting it is indeed SAO that is at fault.

Thomas Davies
thdavies@…

Change History (4)

comment:1 Changed 10 years ago by thomasd

  • Resolution set to fixed
  • Status changed from new to closed

Not applicable with later revisions to PPS/SPS handling.

comment:2 Changed 10 years ago by davidf

  • Component set to HM

Updating component after adding WD (Text) tickets

comment:3 Changed 9 years ago by davidf

  • Cc fbossen ksuehring davidf added

comment:4 Changed 9 years ago by davidf

  • Cc jct-vc@… added
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  • David Flynn(Subscriber, Participant)
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  • Karsten Suehring(Subscriber, Always)
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