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Trying to get first time Magenta installation to generate a playable midi.

After upgrading bazel on OSX to ‘Build label: 0.2.3’ Magenta works with this ‘example.mid’ input midi placed in a subdirectory.

tmp3/example.mid

4d54 6864 0000 0006 0001 0002 00dc 4d54
726b 0000 0019 00ff 5804 0402 1808 00ff
5103 03d0 9000 ff59 0200 0001 ff2f 004d
5472 6b00 0000 4000 c000 0090 3c64 8151
3c00 0b3e 6481 513e 000b 4064 8151 4000
0b41 6481 5141 000b 4364 8151 4300 0b45
6481 5145 000b 4764 8151 4700 0b48 6481
5148 0001 ff2f 00

after running 

bazel build magenta:convert_midi_dir_to_note_sequences

then

mkdir out3
touch out3/newexample.mid

./bazel-bin/magenta/convert_midi_dir_to_note_sequences \
--midi_dir=/Users/user/Downloads/magenta-master/tmp3 \
--output_file=/Users/user/Downloads/magenta-master/out3/newexample.mid \
--recursive

you get

out3/newexample.mid

2101 0000 0000 0000 072b 7cb0 0a36 2f69
642f 6d69 6469 2f74 6d70 332f 3364 3864
3537 3835 6634 3838 6666 6438 3837 3566
3130 6131 3238 3538 6336 6636 6332 3135
3230 3638 120b 6578 616d 706c 652e 6d69
641a 0474 6d70 3320 dc01 2a04 1004 1804
3200 3a09 1100 0000 0000 006e 4042 0d08
3c10 6421 6666 6666 6666 ce3f 4216 083e
1064 1900 0000 0000 00d0 3f21 3333 3333
3333 df3f 4216 0840 1064 1900 0000 0000
00e0 3f21 9999 9999 9999 e73f 4216 0841
1064 1900 0000 0000 00e8 3f21 9999 9999
9999 ef3f 4216 0843 1064 1900 0000 0000
00f0 3f21 cdcc cccc cccc f33f 4216 0845
1064 1900 0000 0000 00f4 3f21 cccc cccc
cccc f73f 4216 0847 1064 1900 0000 0000
00f8 3f21 cccc cccc cccc fb3f 4216 0848
1064 1900 0000 0000 00fc 3f21 cccc cccc
cccc ff3f 49cc cccc cccc ccff 3f13 5fbf
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but the music file doesn’t play. Even if you add ‘ff2f 00’ (common suggestion) to the end.

How can you make this resulting file play in a player such as Quicktime 7? Any ideas?

New User
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  • The output is not a MIDI file. And the input already is a playable MIDI file. – CL. Jun 06 '16 at 08:30
  • Thanks, I now understand the generated output is a TFRecord file with NoteSequence protobufs abstraction not a midi. So, must be converted back into it’s original format before playable. – New User Jun 06 '16 at 23:33

1 Answers1

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We've recently added a model that you can train to generate new sequences. Have a look at https://github.com/tensorflow/magenta/blob/master/magenta/models/basic_rnn/README.md.

Thanks!

Adam Roberts
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