-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Jan 28, 2006, at 20.40, Matt wrote:
> Chris, > > I'm excited to see that some of the iPod settings have been put into > nuvexport. However, it's disabled because it says "Your ffmpeg > installation doesn't support encoding to mov file formats." I've > configured ffmpeg to build with x264, isn't that the proper format? > Any other ideas? x264 is just the codec pack. It doesn't include anything on the container. You might want to look into mp4box. > > > Also, I wanted to add this... just because I think it could be > relavent to making sure that anything encoded for the video iPod meets > the correct standards: > > http://www.ilounge.com/index.php/articles/comments/the-complete- > guide-to-ipod-video-formats-and-display-resolutions/ > > Quote: > > Apple publicly says that the iPod has the following video limitations: > > > H.264 MPEG-4 > Maximum Resolution 320x240 480x480 > Maximum Bitrate 768 kbps 2500 kbps > Maximum Framerate 30 fps 30 fps > > > However, the company has actually simplified the iPod's real > limitations to make them easier for people to understand. Many users > have discovered that while the bitrate limits above appear to be > absolute, the resolutions are not. Rather, they observed that the > equivalent number of total pixels appeared to be the practical limit > for both H.264 and MPEG-4 - 76,800 and 230,400, respectively. Like > Apple's own numbers, these pixel limits are useful and simple ways to > make sure your files run properly, but these numbers are not > technically correct, either. > > Rather, the correct limit can be stated as follows: > > For H.264, you're allowed 300 square blocks of pixels (called > "macroblocks"), 16 pixels on a side. For MPEG-4, you're allowed 900. > > The widely-published "total pixel limits" for H.264 and MPEG-4 will > indeed work in most cases, but not always, and macroblocks yield the > right numbers. For example, an MPEG-4 video of dimensions 725 x 315 > has less than 230,400 pixels, but 920 macroblocks. Such a file would > be incompatible with the iPod. > > For reference, here are a few resolutions that satisfy the maximum > macroblock limits at various video aspect ratios: > > > H.264 > 480x160 > 432x176 > 400x192 > 368x208 > 336x224 > 320x240 - ideal > 288x256 > 272x272 > > > MPEG-4 > 784x288 > 752x304 > 720x320 > 672x336 > 640x352 > 624x368 > 592x384 > 576x400 > 480x480 -ideal > > Thanks! > Matt > _______________________________________________ > mythtv-users mailing list > [email protected] > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (Darwin) iD8DBQFD3C5twAwn3hu8KxcRAumzAJwJqhCEXa+WQ0diSStb0Qe5iPSXigCfRiOE kP8/4IMizh5USSjhqyDs2Ag= =OZLj -----END PGP SIGNATURE----- _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
