On Tue, Sep 20, 2005 at 03:58:22PM -0400, Brian McEntire wrote: > When resizing, is it possible to accidentally stretch the image? > > I saw someone say 480x480 wouldn't be a noticeable difference from > 720x480... is the because of the way a TV uses scan lines? On a > monitor it seems like it would be very different. > > I'm curious because I want to transcode HDTV (1920x1080, 1280x720, > and 850x480) down to 850x480. > > For HDTV pulled off of QAM/Cable, I'm seeing MPEG2 file sizes of > about 6.2GB/hr.
I've been transcoding my HD-3000-captured HDTV recordings down to 856x480 at 4400kbps (bitrate scaled to 640x480), for about 1.8GB/hr. It looks fine. My "Medium Quality" stuff is at 720x480 at 3300kbps (bitrate scaled from 640x480), and it also looks fine. I've been playing around with "Low Quality", currently at 640x480 at 2200kbps, and it also looks fine, for a little over 1GB/hr. I've been ratcheting it lower and lower. There is visible difference between the three resolution/bitrate settings (more blocking, etc.), but everything is still very watchable on a 42" RPTV. --Rob
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