The LGM 2007 presentation was shot in a fairly dark room with no extra lighting so it was noisy. And, since my little Canon Optura 20 isn’t a 480p camera, I have to deinterlace the footage. It also has still images interspersed throughout the video, which can be destroyed by some noise reduction algorithms. Here’s how I did it with my combination of Cinelerra and Mencoder…

Save your deinterlacing step for Mencoder. While Cinelerra’s deinterlacing is pretty good, Mencoder’s deinterlacer is better. Take a look at the yadif deinterlacer on the Layer of the Multimedia Guru’s page of deinterlace filters and see it in action on the command below.

High quality render with noise reduction and proper deinterlacing:

mencoder -ovc lavc -oac lavc -of mpeg -mc 0 -mpegopts format=dvd -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=6000:vqmin=1:keyint=25:aspect=16/9:abitrate=224:acodec=mp2:vstrict=0:dc=10:trell:mbd=2:precmp=2:subcmp=2:cmp=2:dia=-10:predia=-10:cbp -vf yadif,hqdn3d,harddup -ofps 30000/1001 -o output_file.mpg input_files_*.dv

The lavc noise reducer (nr=[n]) on Mencoder does strange things to still images (specifically OO.o Impress slides), while denoise3d and hqdn3d do not.

This entry was posted on Wednesday, May 16th, 2007 at 6:45 pm and is filed under Computers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.