six6
16th November 2003, 07:08
This is concerning DVD->AVI. I'm used to cropping and resizing for Divx encodes to acheive good compression compared to resolution, should I be doing a similar process for mpeg-2?
My reasoning so far against cropping/resizing is this: for around 1 Mbit/sec, my encodes appear closer to original if I don't resize or crop the input through avisynth. I compared the following in CCESetWorkingDir(whatever)
LoadPlugin("mpeg2dec3.dll")
mpeg2source(whatever)
ConvertToYUY2()
AddAudio() to SetWorkingDir(whatever)
LoadPlugin("mpeg2dec3.dll")
mpeg2source(whatever)
crop(whatever)
BicubicResize(whatever)
ConvertToYUY2()
AddAudio() but I suppose one could use any resize filter.
To compare the two videos, I open them via virtualdubmod then resize the video from the second script (width<720 by height<480) to be the same (approx) size as the one from the first script (720 by 480). I assume that this is what a suitable media player (ex: MPC) does during full screen playback of a movie with height<480 and width<720.
Anyway, maybe it seems better because I'm using a $15 used monitor. But can someone else attest that cropping/resizing makes a positive difference in playback quality? I can upload some images if someone wants to see the differences I see.
My reasoning so far against cropping/resizing is this: for around 1 Mbit/sec, my encodes appear closer to original if I don't resize or crop the input through avisynth. I compared the following in CCESetWorkingDir(whatever)
LoadPlugin("mpeg2dec3.dll")
mpeg2source(whatever)
ConvertToYUY2()
AddAudio() to SetWorkingDir(whatever)
LoadPlugin("mpeg2dec3.dll")
mpeg2source(whatever)
crop(whatever)
BicubicResize(whatever)
ConvertToYUY2()
AddAudio() but I suppose one could use any resize filter.
To compare the two videos, I open them via virtualdubmod then resize the video from the second script (width<720 by height<480) to be the same (approx) size as the one from the first script (720 by 480). I assume that this is what a suitable media player (ex: MPC) does during full screen playback of a movie with height<480 and width<720.
Anyway, maybe it seems better because I'm using a $15 used monitor. But can someone else attest that cropping/resizing makes a positive difference in playback quality? I can upload some images if someone wants to see the differences I see.