It's right that Xing is incredibly fast. It uses a lot of MMX asm, but this
can't explain the speed difference.
Their encoding is also less acurate than Lame or FhG for the same bitrate.
I noticed that using lame -b 32 -V 0, ie using the best quality possible
with Lame, lame files are always smaller than Xing ones with best settings.
It just means that Xing is less acurate than Lame
Gabriel Bouvigne - France
[EMAIL PROTECTED]
icq: 12138873
MP3' Tech: www.mp3tech.org
----- Message d'origine -----
De : <[EMAIL PROTECTED]>
À : <[EMAIL PROTECTED]>
Envoyé : dimanche 6 juin 1999 14:55
Objet : [MP3 ENCODER] xing timings...impressive
> Hi all,
> Just did a whole batch of timings and stuff. xing is pretty darn
fast.
> probably a lot of coded asm?
> Also included is a runtime profile of LAME (default options), just
FYI.
> Anyone know anything about x86 asm? Quantize is a reasonably "simple"
> function that could probably benefit from a nice pure asm
> core. It won't be other-architecture friendly but it'd help a lot of x86
> people. :)
> Has anyone else read "a high performance software implementation
of
> mpeg audio encoder" by Kumar and Zubair? A few ideas in there that I once
tried
> to implement (and failed completely :). And did anyone ever find their
> follow-up paper where they were going to discuss how they got a 5fold
increase
> in psychoacoustic model performance?
>
> later
> mike
> -----------------------------------------------------
>
> Artist: My Friend the Chocolate Cake
> Song: Dance (you stupid monster to my soft song)
> Time: 2:35 (155seconds)
> Type: 44.1 kHz 16bit Wav ripped with cdparanoia.
> Size: 27541964
> Style: acoustic - cello, piano.
> CPU: p166/mmx
> Encoder: xing linux
>
> settings time size av.kbps
> default(128/js) 105 2496888 128
> 128/js/16khz 100
> 128 stereo 100
> 128 dualstereo 82
> 128 mono 48
> vbr 0 85 1354096 70
> vbr 1 86 1354096 70
> vbr 30 96 1587707 82
> vbr 50 98 1937609 100
> vbr 100 98 2813604 145
> vbr 150 98 3783694 195
>
> Encoder: lame3.11
> settings time size av.kbps
> default(128/js) 477
> js 128,fast 199
> force 128 372
> fast,force,128 185
> V 9, 112 471 2225321 114
> V 4, 112 691 2537043 131
> V 1, 112 1031 3168955 163
>
> -------------------------------------------------
> Flat profile:
>
> Each sample counts as 0.01 seconds.
> % cumulative self self total
> time seconds seconds calls ms/call ms/call name
> 28.10 131.93 131.93 819321 0.16 0.16 quantize
> 14.31 199.10 67.17 181120 0.37 0.37 calc_noise2
> 8.19 237.54 38.44 11955 3.22 7.21 L3psycho_anal
> 7.39 272.24 34.70 5179917 0.01 0.01 count_bit
> 5.26 296.93 24.69 95640 0.26 0.26 fht
> 5.24 321.53 24.60 819321 0.03 0.08 count_bits
> 5.06 345.31 23.78 430344 0.06 0.06 window_subband
> 3.10 359.87 14.56 430344 0.03 0.03 IDCT32
> 2.56 371.90 12.03 5977 2.01 50.61 iteration_loop
> 2.41 383.20 11.30 11954 0.95 24.20 outer_loop
> 2.40 394.48 11.28 765056 0.01 0.01 mdct
> 2.17 404.68 10.20 23910 0.43 1.74 L3psycho_energy
> 1.85 413.38 8.70 430344 0.02 0.05 filter_subband
> 1.66 421.17 7.79 2425261 0.00 0.02 new_choose_table
> 1.24 426.98 5.81 95640 0.06 0.32 fft
> 1.20 432.61 5.63 5977 0.94 2.83 mdct_sub
> 1.10 437.77 5.16 188915 0.03 0.03 amp_scalefac_bands2
> 0.77 441.37 3.60 23910 0.15 0.15 sprdngf1
> 0.59 444.15 2.78 8370932 0.00 0.00 BF_addEntry
> 0.58 446.85 2.70 5778862 0.00 0.00 putbits
> 0.53 449.33 2.48 23910 0.10 0.10 sprdngf2
> 0.44 451.39 2.06 21557 0.10 0.10 calc_noise1
> 0.40 453.28 1.89 2811077 0.00 0.00 HuffmanCode
> 0.36 454.99 1.71 5977 0.29 78.56 makeframe
> 0.36 456.69 1.70 23908 0.07 0.28 Huffmancodebits
> 0.32 458.17 1.48 5326387 0.00 0.00 WriteMainDataBits
> 0.31 459.62 1.45 372197 0.00 0.00 preemphasis2
> 0.26 460.85 1.23 5978 0.21 0.21 get_audio
> 0.23 461.94 1.09 23908 0.05 0.05 calc_xmin
> 0.22 462.96 1.02 11955 0.09 0.09 fft_side
> <snipped everything below 1second. total runtime 469.55>
>
> % the percentage of the total running time of the
> time program used by this function.
>
> cumulative a running sum of the number of seconds accounted
> seconds for by this function and those listed above it.
>
> self the number of seconds accounted for by this
> seconds function alone. This is the major sort for this
> listing.
>
> calls the number of times this function was invoked, if
> this function is profiled, else blank.
>
> self the average number of milliseconds spent in this
> ms/call function per call, if this function is profiled,
> else blank.
>
> total the average number of milliseconds spent in this
> ms/call function and its descendents per call, if this
> function is profiled, else blank.
>
> name the name of the function. This is the minor sort
> for this listing. The index shows the location of
> the function in the gprof listing. If the index is
> in parenthesis it shows where it would appear in
> the gprof listing if it were to be printed.
>
> --
> MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
>
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