See also: http://ustensile.be/Command-line_cinema
Last time we ended with the following script:
espeak "and now for something completely different" -v en -p 99 -s 50 -w hello.wav
sox hello.wav padded.wav pad 3 3
sox padded.wav -b 8 -e unsigned-integer -c 1 -r 4000 -t raw rawfile
rm frame*.jpg
python speak.py
ffmpeg -r 10 -i frame%09d.jpg -i padded.wav -y output.mp4
Project Gutenberg ~ http://www.gutenberg.org/
Let's download some audio from Librivox with wget:
wget http://ia902604.us.archive.org/10/items/apologie_de_socrate_l_librivox/apologie_socrate_01_platon.mp3
And adjust the recipe to work with this audio, using ffmpeg to convert to wav (since the default sox install doesn't like mp3)...
ffmpeg -i apologie_socrate_01_platon.mp3 -y apologie_socrate_01_platon.wav
sox apologie_socrate_01_platon.wav padded.wav pad 0 1
sox padded.wav -b 8 -e unsigned-integer -c 1 -r 4000 -t raw rawfile
rm frame*.jpg
python speak.py
ffmpeg -r 10 -i frame%09d.jpg -i padded.wav -y output.mp4
Youtube-dl
YOu might also want to rip a movie from youtube.
Check if you have youtube-dl already installed by simply trying to run it from the shell:
youtube-dl
If you need to install it that'd be either:
(Linux)
sudo apt install youtube-dl or (OSX)
brew install youtube-dl
Using youtube-dl URL
Mplayer
Basic key commands when playing a movie with mplayer
SPACE: Pause/Play
. : Forward one frame
Left + Right : Jump
9 0 : Volume
[ ] : Speed
o : Toggle display mode (shows current time and duration)
f : Toggle fullscreen
s : Save current frame (with -vf screenshot, see Mplayer Snapshots)
q : Quit
Time options
# Play from 10 seconds to 1 minute 6 seconds.
mplayer -ss 10 -endpos 56
# Play from 01:10:30 - 01:11:00
mplayer -ss 01:10:30 -endpos 30
Extracting Frames from a Movie: Mplayer Snapshots
mplayer -vf screenshot <source>
Then while the movie is playing ... press the s key each time you want to save a frame. You should find files named like:
shot0001.png
shot0002.png
shot0003.png
shot0004.png
Extracting Frames from a Movie: ffmpeg
ffmpeg -i <source> <destination%06d.jpg>
Selecting a section of a video with ffmpeg
Extract 3 seconds starting at (near) 05:47 and save as snip.mp4
ffmpeg -ss 05:47 -t 03:00 -i ten.mp4 snip.mp4
Extract to images
ffmpeg -ss 12:00 -vframes 100 -i
Timing (start + stop) can be controlled with -ss (skip start) and -t (total time of result)
When -ss is before the -i ffmpeg attempts to JUMP which is fast only precise to the nearest key frame.
When you put -ss after the -i, the timing is more precise but it's slower as the movie is actually played (quickly) up to that precise point.
# Extract 3 seconds starting at (exactly) 05:47 and save as snip.mp4
ffmpeg -i ten.mp4 -ss 05:47 -t 3 snip.mp4
ffmpeg -ss 05:47 -i powersof10/ten.mp4 -vframes 10 snip%04d.jpg
# Starting at 05:47 output one frame every 5 seconds for 10 frames, save using names starting snip0001.jpg
ffmpeg -ss 05:47 -i powersof10/ten.mp4 -r 1/5 -vframes 10 snip%04d.jpg
# Combine Image Sequence starting frames000001.jpg and the audio in soundtrack.wav
# Save result as "result.mp4"
ffmpeg -i frames%06d.jpg -i soundtrack.wav result.mp4
Example:
ffmpeg -ri 10 -i frame%06d.jpg -i apologie.wav apologie.mp4
To force ffmpeg to OVERWRITE any previously existing file (useful when inside a larger script that you want to run again and again) -- add the -y to "AUTO-YES" the question about replacing the output.
ffmpeg -r 10 -i frame%06d.jpg -i apologie.wav -y apologie.mp4
Padding audio
Add 10 seconds to start and 30 seconds to end of input, save as output:
sox input.wav output.wav pad 10 30
Mixing audio
with ffmpeg
ffmpeg -i apologie.wav -i badmusic.wav -filter_complex amerge mix.mp3
it uses the duration of the shortest file.
you can also explicitly limit the number of audio channels with:
ffmpeg -i apologie.wav -i badmusic.wav -filter_complex amerge -ac 1 mix.mp3
Sequence (concatenate) audio / video
For audio, you can use sox like this:
sox a.wav b.wav c.wav output.wav
For video, you can use mlt / melt .....
melt a.mp4 b.mp4 c.mp4 -consumer avformat:output.mp4 b=1000k
You can also use melt to combine still images as "inter-titles", the numbers with "out" are frames (so for output at 25 fps, 50 = 2 seconds):
melt title2-0.png out=50 \
video.mp4 \
title2-1.png out=100 \
-consumer avformat:output.mp4 b=1000k
To do this with ffmpeg you need to make a sort of playlist file that looks like:
playlist.txt
file 'a.wav'
file 'b.wav'
file 'c.wav'
ffmpeg -f concat -i concat.txt concat.mp3
See: https://trac.ffmpeg.org/wiki/Concatenate
Text / Titles
Imagemagick! http://www.imagemagick.org/Usage/text/
convert -size 640x480 -gravity center -pointsize 72 -font CoupeurBoldBlock.otf -background lightblue -fill blue caption:'HEY what about a very long text then?' title.png
with a newline:
convert -size 640x480 -gravity center -pointsize 72 -font CoupeurBoldBlock.otf -background lightblue -fill blue caption:'HEY!\n what about a very long text then?' title.png
What colors?
convert -list color
Random color!
convert -list color | cut -d" " -f1 | shuf | head -n1
There's also label:, but it doesn't do word wrap.
convert -size 640x480 -gravity center -pointsize 72 -font ~/.fonts/coupeur-boldblock/CoupeurBoldBlock.otf -background lightblue -fill blue caption:'HEY what about a very long text then?' title.png
convert -size 640x480 -gravity center -pointsize 72 -font -background lightblue -fill blue label:'magic\nmagic!!!' whoami.png
title with random colors:
convert -size 640x480 -gravity center -pointsize 72 \
-font ~/.fonts/coupeur-boldblock/CoupeurBoldBlock.otf \
-background $(convert -list color | cut -d" " -f1 | shuf | head -n1) \
-fill $(convert -list color | cut -d" " -f1 | shuf | head -n1) \
label:'Surprise!!!' surprise.png
TITLE
c1=shuf imcolornames.txt | head -n 1
c2=shuf imcolornames.txt | head -n 1
convert -size 640x480 -background $c1 -fill $c2 -pointsize 72 -gravity center -f
ont /home/murtaugh/.fonts/OSP_Libertinage/Libertinage-s.ttf label:Contemporaneit
y contemporaneity.png
NB: Using the @ sign with label to read from a file seems to be blocked (by some kind of security "policy").... back quoting a file might work though?!