[jmsl] MIDI File Transcriber Crashes

[jmsl at music.columbia.edu]

Nick,

Thank you so much for taking the time necessary to dig into this.

I was aware the MIDI files in question contained unusual elements, but I
didn't realize they had measures with a negative numerator in the time
signature!  As you suggest, most other transcription software is not
bothered by this and simply displays the absolute value.

I will grab the updated pre-release and give it a whirl first thing
tomorrow morning.

Best,
Greg

-- 
Dr. Greg Wilder, CTO & Co-Founder
Orpheus Media Research, LLC
http://www.orpheusmediaresearch.com/
+1 215-764-6057 (office)
+1 215-205-2893 (cell)

jmsl at music.columbia.edu wrote:
> Hi Greg
> 
> I believe I have solved this problem. The MIDI files that you sent me
> offlist had some anomalous time signatures in them.  I've never seen
> this before, but a very few of the time signatures were negative (like
> -8/4 time). This crashed the transcriber that lays out the measures of
> the score from the time signatures in the MIDI file.  It would not throw
> off midi playback devices that simply read note events.
> 
> MIDIFileToMusicShape now takes the absolute value of the time signature
> events in a midi file to safeguard against this.  Both your MIDI files
> import in a flash now, with no trouble. I just ran your code on both
> your midi files and they produce nice Lilypond output.  Note that there
> are some time signatures in there that do not seem very typical of
> Mozart or Handel, like 1/4, 15/4, and 13/4. JMSL does not guess at these
> time sigantures; they are specified in the MIDI file. But that's not a
> JMSL issue, and in any case I don't object to these time signatures!
> 
> When you wrote that shortening the MIDI files seemed to solve the
> problem, it was a bit of a red herring. It was not the size that was the
> problem (ie running out of memory or something similar), but you met
> with success when you happened to truncate the midi file before the
> negative time signatures occurred.
> 
> You can download a pre-release that includes this bug fix at
> http://www.algomusic.com/prerelease/
> 
> This pre-release also includes a bug fix that Georg Hajdu alerted me to,
> related to exporting MIDI files from Score (chord intervals with midi
> style velocities were not getting written properly)
> 
> Thanks
> Nick Didkovsky
> 
> 
> 
> jmsl at music.columbia.edu wrote:
>> Hi Nick,
>>
>> We've spent several days trying to nail down the root cause of the
>> trouble.  The Score transcriber appears to crash with larger MIDI files
>> that contain more than 1600 (or so) discrete events.
>>
>> I've attached a couple of examples that should allow you to reproduce
>> the issue.  (We've been able to successfully pass these through by
>> shortening them considerably...)
>>
>> Thanks for the much needed assistance,
>> Greg
>>
>>
>> jmsl at music.columbia.edu wrote:
>>  
>>> Hello Greg
>>>
>>> I tried your code with a MIDI file I happened to have on my system and
>>> it ran OK.
>>> So there must be something in the MIDI file you are using that is
>>> revealing a bug that I cannot reproduce.
>>> I would be happy to inspect your MIDI file and see if I can track down
>>> what's causing the problem with JMSL's transcriber
>>>
>>> Thanks
>>> Nick Didkovsky
>>>
>>> jmsl at music.columbia.edu wrote:
>>>    
>>>> Hi all,
>>>>
>>>> I'm getting the following error (attached) when attempting to
>>>> transcribe
>>>> a MIDI file with the code in the attached sample.
>>>>
>>>> Any ideas as to what is going wrong?  What other information would be
>>>> helpful in tracking this down?
>>>>
>>>> TIA,
>>>> Greg
>>>>
>>>>  
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