import bpy
is_ntsc = (bpy.context.scene.render.fps != 25)

bpy.context.scene.render.ffmpeg.format = "DV"
bpy.context.scene.render.resolution_x = 720

if is_ntsc:
    bpy.context.scene.render.resolution_y = 480
else:
    bpy.context.scene.render.resolution_y = 576

bpy.context.scene.render.ffmpeg.audio_mixrate = 48000
bpy.context.scene.render.ffmpeg.audio_codec = "PCM"
bpy.context.scene.render.ffmpeg.audio_channels = "STEREO"