Hi,
I'm using LilyPond 2.8.1 on WinXP and had a horrible time trying to process some
html files containing the lilypond fragments. Everything went OK (after I put
the lilypond-book in function installing Python...), but no png files where ever
generated in the end. I debugged the source code in Python of lilypond-book and
it really seems to me that a line was forgotten somewhere around the line 1398,
under "def process_snippets", or more concretely under "def my_system". Beneath
the line
if ly_names: my_system (string.join ([cmd, 'snippet-map.ly'] + ly_names))
I think there is missing a line
if png_names: my_system (string.join ([cmd, '-f png', 'snippet-map.ly'] +
png_names))
When I put this line into the source, everything was alright.