Re: Converting .midi to .ly (midi2ly.py)

[Mats Bengtsson]

Felix Hekhorn wrote:
> Well i just started from the very beginning - i unistalled Python + LilyPond
> then i installed LilyPond again - selecting theLilyPond-Python
> (i did it again to C:/Programme/ - it is the most handy directory and 
> (unfortunately) i trust on Windows )
> then i put my file to C:/
> and here is the whole error-message i get:
> "C:\Programme\LilyPond\usr\bin>midi2ly c:/pirate_medley.mid -V
> Traceback (most recent call last):
>  File "C:\Programme\LilyPond\usr\bin\midi2ly.py", line 996, in ?
>   main()
>  File "C:\Programme\LilyPond\usr\bin\midi2ly.py", line 994, in main
>   convert_midi (f, o)
>  File "C:\Programme\LilyPond\usr\bin\midi2ly.py", line 834, in convert_midi
>   for (dur, num, den) in global_options.allowed_tuplets:
> SystemError: /home/lilydev/vc/gub/target/mingw/src/python-2.4.2/Objects/listobje
> ct.c:243: bad argument to internal function"
> i can't understand why !?
>
>   
The good news is that you have solved your initial Python related problems.
Still, I don't understand why you keep changing directory to the 
LilyPond bin\
folder. All the LilyPond programs should be available from any folder.

The bad news is that this seems to be some Windows related bug. In Linux, I
can run midi2ly on your MIDI file without any problems, but in Windows I
get exactly the same error message as you do. Strangely enough, it works 
well
for some MIDI files but not for others. I did some quick experimenting with
the midi2ly script and my conclusion is that the error message is 
misleading
and the actual error is something completely different. Apparently the same
bug has been reported already more than a year ago, but since it only 
shows up
for certain MIDI files and only on Windows (which is hard to debug since 
all
the development is done in Linux), nobody has spent any time on it.

However, even if you managed to run midi2ly, I'm not sure you would be
very happy with the resulting .ly file and printout. I attach the 
resulting output
for your file and as you can see, midi2ly has problems to interpret the 
rhythm
in the MIDI file and will probably only work reasonably well for MIDI files
produced by other typesetting programs (if that program doesn't make too
much efforts to make the MIDI sound musical, that is). Search the mailing
lists for related discussions on the limitations of midi2ly. Most people 
who have
tried midi2ly have soon realized that it's just as  quick to enter the 
music
directly into the .ly file, especially since you normally spend just as 
much time
adding articulations and such, as the actual pitches and durations. This is
another main reason that there hasn't been any active development of midi2ly
for several years.

In the attached file, I used the flag --duration-quant=32 to somewhat 
improve
the situation, but it doesn't help so much.

  /Mats

> and another point is:
> another user answered on my question and i send him the file;
> but he was also unable to convert it!
> - i start thinking maybe it's a mistake in the Script itself
> but as i said, i can only guess how python works
>
> can you do me a favour? Please try to convert the file on your system - Thank 
> You
>
> Mfg Felix Hekhorn
>
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>   

--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================

pirate_medley-midi.zip
Description: Zip compressed data