Re: Video generation, bash script, keeps sync in spite of tempo changes

[Phil Hézaine]

On 06/09/2016 14:22, Knut Petersen wrote:
> Hi everybody!
>
> I think some people might be interested in the files attached.
>
> JSBI1.ly is a sample document (Bach Invention No. 1) that demonstrates
> the syntax.
> It includes some insane tempo changes and a bad layout to force pages
> with a variable
> number of systems. You'll see that despite of this video and audio keeps
> synchronized.
>
> videohelper.ily includes some code to generate a helper file during the
> lilypond run.
>
> mkvideo is a bash script that generates videos from the lilypond output,
> following
> instructions generated during the lilypond run. mkvideo use the
> following tools
>
> ls, sort, tail, uniq, grep, sed, bc, gs, pdftk, fluidsynth, sox, ffmpeg
> and the
>  /usr/share/sounds/sf2/FluidR3_GM.sf2 sound file.
>
> Put the attached files into a seperate directory, don't forget "chmod
> 700 mkvideo",
> and execute
>
>     lilypond JSBI1
>    ./mkvideo
>
> mkvideo is pretty fast (lilypond time here approximately 1.6 seconds, video
> generation time less than 9 seconds on an i4790K system)
>
> cu,
>  Knut

Hi Knut,

It seems there are 2 errors in videohelper.ily, line 128 and 146:

GNU LilyPond 2.18.2
Traitement de « JSBI1.ly »
Analyse...
Interprétation en cours de la musique...[8][16]
Pré-traitement des éléments graphiques...
Détermination du nombre optimal de pages...
Répartition de la musique sur une page...
Dessin des systèmes...
Sortie mise en page vers « JSBI1.ps »...
Conversion à « ./JSBI1.pdf »...
videohelper.ily:146:2: Erreur : GUILE a signalé une erreur pour 
l'expression débutant ici
#
 (format out "~a~a~a" "LILYSOURCE=" (ly:parser-output-name) ".ly\n")
Wrong number of arguments to #<primitive-procedure ly:parser-output-name>
Interprétation en cours de la musique...[8][16]
Pré-traitement des éléments graphiques...
Détermination du nombre optimal de pages...
Répartition de la musique sur 7 à 8 pages...
Dessin des systèmes...videohelper.ily:128:20: In expression (grob::when 
(car m)):
videohelper.ily:128:20: Unbound variable: grob::when

Phil.