Geração de screenshots com mplayer

Colaboração: Rubens Queiroz de Almeida

Data de Publicação: 28 de Setembro de 2009

Os leitores de vídeo possuem um recurso bastante útil: a geração de imagens a partir da exibição dos vídeos. Eu já usei este recurso diversas vezes, para criar albuns de fotos a partir de vídeos gravados.

Para habilitar a criação de screenshots com o programa mplayer, ele deve ser invocado com a diretiva -vf:

$ mplayer -vf screenshot nomedovideo.{avi,flv,etc}

Para criar uma imagem a partir do quadro sendo exibido, basta pressionar a
tecla s. Veja a saída gerada:

sending VFCTRL_SCREENSHOT!001 ct:  0.000 277/277 18% 46%  1.5% 35 0
*** screenshot 'shot0006.png' ***
A:  11.1 V:  10.7 A-V:  0.350 ct:  0.009 322/322 20% 50%  1.7% 69 0



Eu posso gerar quantas imagens desejar. Os arquivos gerados recebem o nome
shotXXXX.png e o valor XXXX é incrementado dinamicamente.

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