2003-12-31, 18:39
pal is nice... 
for euro users i see the following conversions needed:
30hz->25hz
far most direct way is not to do the conversion at all, but to switch the xbox to 60hz mode. also this provides the best possible end result. if the tv-companies are not able to do decent conversions off-line why use time to trying to fix this?
if switching is not possible the current method is good enough i.e. skipping every sixth field.
also it will be hard to know when to use inverse telecine and when the material is native 30fps. dvd players can always read the flags from the stream, but as far i know most of mpeg4 streams do not have these flags.
most 30fps mpeg4 content i have come across is native ntsc stuff i.e. tv series. ivtc cannot be used on these.
24->25fps
speeding up is absolutely the best way to deal with this.
(worst way is to telecine to ntsc and the convert to pal without inverse telecining. i have seen these too...)
30->24->25 (inverse telecining + speeding up)
i see this worthwhile for ntsc dvd playback. as most of the mpeg4 streams are ivtcd already it does not seem worth the effort for these only.
for euro users i see the following conversions needed:
30hz->25hz
far most direct way is not to do the conversion at all, but to switch the xbox to 60hz mode. also this provides the best possible end result. if the tv-companies are not able to do decent conversions off-line why use time to trying to fix this?
if switching is not possible the current method is good enough i.e. skipping every sixth field.
also it will be hard to know when to use inverse telecine and when the material is native 30fps. dvd players can always read the flags from the stream, but as far i know most of mpeg4 streams do not have these flags.
most 30fps mpeg4 content i have come across is native ntsc stuff i.e. tv series. ivtc cannot be used on these.
24->25fps
speeding up is absolutely the best way to deal with this.
(worst way is to telecine to ntsc and the convert to pal without inverse telecining. i have seen these too...)
30->24->25 (inverse telecining + speeding up)
i see this worthwhile for ntsc dvd playback. as most of the mpeg4 streams are ivtcd already it does not seem worth the effort for these only.
