[FFmpeg-devel] MXF D10 regression tests

[Michael Niedermayer]

On Mon, Mar 16, 2009 at 12:50:33PM +0100, Reimar D?ffinger wrote:
> Hello,
> As some of you may have noticed, regression tests are broken on PPC,
> PPC64 and ARM, curiously in the same way on all of these, e.g.:
> --- /misc/fate/beagle/source/tests/libav.regression.ref	2009-03-15 00:19:14.593308713 +0000
> +++ tests/data/lavf.regression	2009-03-16 10:32:47.398450178 +0000
> @@ -12,9 +12,9 @@
>  259a87c8d22aab76665047ecdbfa9267 *./tests/data/b-libav.mxf
>  535097 ./tests/data/b-libav.mxf
>  ./tests/data/b-libav.mxf CRC=0xd7ff387d
> -0a7cc51de3da754ce36dffeeda290c45 *./tests/data/b-libav.mxf_d10
> +e3f2a399f03916512c92792ff58fc83b *./tests/data/b-libav.mxf_d10
>  5330989 ./tests/data/b-libav.mxf_d10
> -./tests/data/b-libav.mxf_d10 CRC=0xd241c8b6
> +./tests/data/b-libav.mxf_d10 CRC=0x9664b562
>  c0cc2ae4df6a8b3df84986929a393116 *./tests/data/b-libav.ts
>  471316 ./tests/data/b-libav.ts
>  ./tests/data/b-libav.ts CRC=0xcc4948e1
> 
> For some reason the MPEG-2 encoder encodes differently on those
> platforms (or it gets different data).
> --disable-mmx did not change the x86 result, I even set ARCH_X86 etc.
> all to 0 to get a pure C version, nor could I see a change when using
> --disable-altivec on PPC, nor did valgrind show any issues.
> Keep in mind though that I often mess something up when doing that kind
> of testing.
> Since all that is a complete mystery to me I leave it to someone else to
> fix it, and give you what I have so far.
> 
> The file is generated by this command:
> ./ffmpeg_g -y -flags +bitexact -dct fastint -idct simple -sws_flags
> +accurate_rnd+bitexact -t 1 -qscale 10 -f image2 -vcodec pgmyuv -i
> ./tests/vsynth1/%02d.pgm -f s16le -i ./tests/asynth1.sw -ar 48000 -ac 2
> -r 25 -s 720x576 -padtop 32 -vcodec mpeg2video -intra -flags
> +ildct+low_delay -dc 10 -flags2 +ivlc+non_linear_q -qscale 1 -ps 1 -qmin
> 1 -rc_max_vbv_use 1 -rc_min_vbv_use 1 -pix_fmt yuv422p -minrate 30000k
> -maxrate 30000k -b 30000k -bufsize 1200000 -top 1 -rc_init_occupancy
> 1200000 -qmax 12 -f mxf_d10 ././tests/data/b-libav.mxf_d10

thats a scary mix of flags
low_delay + interlacing
qscale 10 and then qscale 1

anyway if someone wants to debug this first thing would be finding a minimal
set of command line options that still cause the difference.

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

In a rich man's house there is no place to spit but his face.
-- Diogenes of Sinope
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