Revision as of 18:35, 22 May 2013

Playing with Video on FOSS

So, you want to play with video inputs/outputs/files without cardboard boxed software? Great!

fix b0rked v4l

You can 'fix' weird pixel formats, programs that dont properly work with your v4l device with these funky preloads;

LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l1compat.so

_or_

LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l2convert.so

Both have their purpose, but I can't keep them apart, just try each ;)

convert, encode stuff

Just some handy copypastes.

Replace the INPUT and OUTPUT, also some codecs support multiple passes, so, pass=1, pass=2, pass=3 etc ... lame presets are just the default commandline lame presets

mencoder INPUT -o OUTPUT -ovc xvid -xvidencopts bitrate=1200:pass=1:turbo:threads=2 -oac mp3lame -lameopts preset=medium

mencoder INPUT -aspect 16:9 -o OUTPUT -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1200:vpass=1:turbo:threads=2 -oac mp3lame -lameopts preset=medium

mencoder INPUT -o OUTPUT -ovc lavc -lavcopts vbitrate=1800:vcodec=mjpeg -nosound

ffmpeg -i INPUT(.avi) -vcodec copy OUTPUT(.mov)

mencoder INPUT -o OUTPUT -ovc lavc -lavcopts vbitrate=1800:vcodec=mjpeg -nosound -vf scale=640:480,pp7 -fps 25