First Results: -7 -s2 gave me significantly worse results than -7 alone. -7 -t2 is just running and it seems to be advantegous. Therefore i will evaluate -t a bit more.
When i have determined the optimum t-parameter for the 3 files, i will try it with the whole test corpus. Well, i really dislike tests with such limited file sets, but because of the slowness anything else isn't practicable. At least not now.
Done. Well, with only 3 files from my DTS-file set m6_44_b:
ALS -7
Add none -s2 -t2 -t3 -t6
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DTS: 16 bit, 44 khz, 6 channels (5.1)
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m6_44_b_02 45.28 45.51 45.24 45.19 45.15
m6_44_b_03 41.33 41.87 41.32 41.23 40.81
m6_44_b_04 45.12 45.25 45.08 45.04 44.95
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-7 -t6 was the best. I just started a respective test with my complete DTS-set. Well, this will take another 10 hours or more...
But the results of the first run of Mpeg4Als are now ready:
TAK FLAC FLAC WavPack ALS
Mode -p2m -p4m -8 -8 -l32 -hhx -7 -7 -t6
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DTS: 16 bit, 44 khz, 6 channels (5.1)
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m6_44_a 30.22 29.38 33.17 33.01 32.42 28.67
m6_44_b 41.69 41.41 45.04 45.00 44.35 42.21
m6_44_c 41.28 41.06 42.69 42.66 42.18 40.60
m6_44_d 40.18 39.76 43.23 43.16 42.09 40.45
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TAK -p4m is better on set b and d, ALS on set a and c.
Sets b and d are those, where TAK's channel decorrelation is most efficient. The following tables show it's advantage for the 4 file sets:
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DTS: 16 bit, 44 khz, 6 channels (5.1)
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m6_44_a 0.34
m6_44_b 1.96
m6_44_c 0.28
m6_44_d 1.48
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ALS's better performance on a and c may be attributed to it's high predictor count of 1023 vs. TAK's 160. A quick test of 2 files with -7 -o160 resulted in a significant decrease of ALS's advantage.
BTW: I used mp4alsRM23 for the tests.