Re: lilypond score in youtube video

[Martin Tarenskeen]

On Wed, 8 Apr 2020, Valentin Villenave wrote:

> On 4/8/20, Martin Tarenskeen <address@hidden> wrote:
> > I now have found my own workflow

1. I created my score using LilyPond including (among other things) this:

#(set! paper-alist (cons '("myvideo" . (cons (* 16 cm) (* 9 cm))) paper-alist))
\paper {
  #(set-paper-size "myvideo")
  top-margin = 2\cm
  left-margin = 1\cm
  right-margin = 1\cm
  page-breaking = #ly:one-line-breaking
}
\header {
  tagline = ##f
}

2. A created a one-line png image and a midifile with lilypond's --png 
output option.

3. I checked the size of the png using the "identify" command. Height was 
358 pixels, let's say 360 to make things easy. I also checked the width of 
the image.

4. I used convert (from ImageMagick) to produce a sequence of png images
https://youtu.be/I4coDW6pyU4 from this png image. Each image gets a size 
of 640 x 360 pixels (16:9 ratio), but I use horizontal shifts of 320 
pixels. The number of images will be width/320

for i in `seq 0 $number_of_images`
do
        x=$((i*320))
        fn=`printf img%02d.png ${i}`
        convert -extract 640x360+${x}+0 oneline.png ${fn}.
done

5. I created a wav file from the midifile using Pianoteq. For other types 
of music I would probably use timidity. Using ffmpeg I converted my wav 
file to AAC (.m4a) format.

6. I then used OpenShot to import the sequence of images and the audio 
file. Openshot allows a framerate to be entered for the image sequence 
like "52 frames per 139 seconds". This way the total duration of the audio 
and the image sequence could be matched.

Another method I tried was to automatically generate a video file from an 
image-sequence using ffmpeg on the commandline. This is also a 
possibility.

7. My music was full of tempo and time changes, and some extra editing was 
required. But this gives you some idea about my workflow. The result can 
be found here, it's not perfect yet but I am learning.... :

https://youtu.be/I4coDW6pyU4

--

MT