[FFmpeg-devel] [PATCH 4/4] avcodec: loongson optimized h264pred with mmi

[Michael Niedermayer]

On Sun, Jul 12, 2015 at 09:13:18PM +0800, 周晓勇 wrote:
> 
> 
> 
> > -----原始邮件-----
> > 发件人: "Michael Niedermayer" <michael at niedermayer.cc>
> > 发送时间: 2015年7月12日 星期日
> > 收件人: "FFmpeg development discussions and patches" <ffmpeg-devel at ffmpeg.org>
> > 抄送: 
> > 主题: Re: [FFmpeg-devel] [PATCH 4/4] avcodec: loongson optimized h264pred with mmi
> > 
> > On Sat, Jul 11, 2015 at 09:02:51PM +0200, Michael Niedermayer wrote:
> > > On Sun, Jul 05, 2015 at 11:43:37PM +0200, Michael Niedermayer wrote:
> > > > On Sat, Jul 04, 2015 at 12:14:51PM +0800, 周晓勇 wrote:
> > > > > i will offer a download source of Fedora21 OS next Monday.
> > > > > i will run yum-builddep ffmpeg-xxx.src.rpm for preparing devel environment.
> > > > >  what else do you need to install, because it maybe slow for downloading other packages abroad.
> > > > > the new FC21 build with mips64el N64 API and mips64r2(-march=loongson3a) isa, and enabled ARCH_MIPS64 after ffmpeg configure.
> > > > > the FC19-O32 was slow, so aborted.
> > > > 
> > > > other things hmm
> > > > ccache, dash, screen
> > > 
> > > with dash configure finished in 1minute instead of 4 with bash (on loongson)
> > 
> > fate no longer passes after installing Fedora21
> > 
> > with
> > dash ./configure --enable-gpl --cc='ccache gcc' --enable-pthreads --samples=/home/loongson/fate/ --enable-nonfree  --enable-version3 --assert-level=2
> > i get failure due to illegal instructions
> > 
> > with
> > dash ./configure --enable-gpl --cc='ccache gcc' --enable-pthreads --samples=/home/loongson/fate/ --enable-nonfree  --enable-version3 --assert-level=2  --cpu=loongson3a --enable-loongson3
> > it fails in dca tests:
> > 
> > TEST    dca-core
> > TEST    dca-xll
> > stddev:  853.28 PSNR: 37.71 MAXDIFF:11651 bytes:  1554432/   700416
> > MAXDIFF: |11651 - 0| >= 1
> > size: |1554432 - 700416| >= 0
> > Test dca-core failed. Look at tests/data/fate/dca-core.err for details.
> > tests/Makefile:202: recipe for target 'fate-dca-core' failed
> > make: *** [fate-dca-core] Error 1
> > make: *** Waiting for unfinished jobs....
> > stddev:  219.18 PSNR: 49.51 MAXDIFF: 2483 bytes:  8994816/  1073152
> > MAXDIFF: |2483 - 0| >= 1
> > size: |8994816 - 1073152| >= 0
> > Test dca-xll failed. Look at tests/data/fate/dca-xll.err for details.
> > tests/Makefile:202: recipe for target 'fate-dca-xll' failed
> > make: *** [fate-dca-xll] Error 1
> > 
> 
> yes, i got this dca failure too. i have encountered many other errors in fate test.

> why do you think it's due to illegal instructions? 

when --cpu=loongson3a --enable-loongson3 is not added then make fate
fails and displays "illegal instruction"

this worked before the upgrade to Fedora21


> i have no idea because ffmpeg or ffplay could decode and play the media data regularly only with wrong decoding.
> if there is illegal instructions, when run ffmpeg or ffplay commands it will show illegal instruction caution.
> in addition, with no optimization fate failed as well.

so what is the plan to continue ?
you suggested to upgrade to Fedora21 but fate does not pass after the
upgrade

you should have tested this before suggesting an upgrade!

i cannot test your patches if fate does not pass

will you fix the failures in Fedora21 or is there some other solution
so we can continue to test and apply patches for loongson
?

ive the strong feeling that you do not care at all that the patches
and code you submit work

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Asymptotically faster algorithms should always be preferred if you have
asymptotical amounts of data
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