Converting PAL to NTSC
I have a number of DVDs on PAL format because they are not available anywhere else. Most of the time it's because I want a widescreen version of a movie. All my DVD drives under Linux and my BD-ROM can all read any region DVDs without having to use regionset, so ripping them is simple enough.
I use libav to convert them. Using
-format ntsc-dvd is pretty much all you need.
Here's a general command:
avconv -i pal.vob -target ntsc-dvd ntsc.mpg
And here is me spiking the bitrates for good measure:
avconv -i pal.vob -target ntsc-dvd -vb 9000k -ab 192k ntsc.mpg