Como hacer un Timelapse con Mencoder en Ubuntu 14.04

Para el proceso de hacer un time lapse, necesitaremos programar la cámara para que saque una foto cada cierto tiempo. Con una GoPro es sencillo hacerlo, pero si tenéis cualquier otra cámara, también lo podéis hacer si la programas para que saque una foto cada cierto tiempo. En el caso de la GoPro podréis sacar cada foto con un intervalo de 5 segundos, 10, 30 o 60.

Por supuesto será necesario dejar la cámara en un trípode o fija. Y procederemos a tomar las fotos. Una vez que las fotos estén hechas, se meten en una carpeta en nuestro pc.

Para empezar, tenemos que instalar Mencoder, si no lo teneis instalado ya. Para eso, la forma más fácil es escribir lo siguiente en el terminal:

sudo apt- get install mencoder

También vamos a instalar imagemagick para usar el comando mogrify, con el que cortaremos las imágenes para adaptarlas al formato de salida. Para ello escribimos:

apt-get install imagemagick

Una vez instalados vamos a proceder a hacer tres tipos distintos de time lapse 4/3, 16/9 redimensionado y 16/9 cortando las imágenes. En mi caso tome las fotos a una resolución de 3000x2250 que es una proporción 4/3, por lo que para esta proporción, solo tendré que unir las imágenes. Y para la proporción 16/9, habrá que redimensionar las imágenes o cortarlas.


4/3 - Original

mencoder mf://*.JPG -mf w=3000:h=2250:fps=15:type=jpg -ovc lavc -lavcopts vcodec=mpeg1video:vbitrate=1152:keyint=15:mbd=2:aspect=4/3 -oac copy -o output4_3.avi


16/9 - Con las imágenes redimensionadas

mencoder mf://*.JPG -mf w=3000:h=1688:fps=15:type=jpg -ovc lavc -lavcopts vcodec=mpeg1video:vbitrate=1152:keyint=15:mbd=2:aspect=16/9 -oac copy -o output16_9.avi

16/9 - Con las imágenes cortadas

mogrify -format JPG -resize "1920x1080^" -gravity north -crop 1920x1080+0+0 +repage *.JPG

ls -1tr | grep -v files.txt > files.txt

mencoder -nosound -noskip -oac copy -ovc copy -o output.avi -mf fps=15 'mf://@files.txt'


Y este atardecer de A Coruña sería el resultado final de un formato 16/9 cortando las imagenes.

o este otro

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