An Avid engineer told me that other formats will not mix with 720@60P because it is essentially a unique frame rate. Thus, 1080@xxxxxx (59.94 fields) would need to be transcoded before it can be used in an Avid project that is specified at the 720@60P rate. In fact, probably any format will need to be transcoded. We might be able to transcode 720@60P material to 1080i for PBS. They have some very limiting rules that allow only certain transcoding and have often kept our material from airing because of perceived quality issues even when better than some of the material they have produced or used directly from PBS. But over all, unless we have some terrible artifacts, this should work. Because so much of our distribution will be through highly compressed media, the 720@60P makes sense. So then that might open up the codec possibilities, wouldn't you think? I have worked with JPEG2000 but not on at a post-production level. I don't know if it has been implemented on the production level or not. Which formats work well in an MXF (and BXF?) wrapper? Dan Craig Birkmaier <craig@xxxxxxxxx> Sent by: opendtv-bounce@xxxxxxxxxxxxx 07/14/2008 06:26 AM Please respond to opendtv@xxxxxxxxxxxxx To opendtv@xxxxxxxxxxxxx cc Subject [opendtv] Re: Production Codecs I would say that your best choices are DNxHD and AVC-Intra. There are several other codecs in QuickTime that may be useful for specific tasks, but I would recommend using a lightly compressed, frame based codec as your house format. JPEG-2000 is also very interesting, as the sub band nature "could" allow for partial decoding for proxy and low bandwidth networked viewing of files without needing to deal with the full HD quality and bit rate requirements. Unfortunately I am not aware of any commercial products that let you do this currently. As for formats, 720@60P is my preference if you cannot use 1080@60P. You can convert 720@60P to 1080@30i with very little loss of quality. By this I mean lower horizontal detail; you will lose some vertical detail when interlacing to 1080i. I do not know of any limitation of 720@60P as a mastering format, sans one. 1080i can carry more horizontal detail, but it offers less vertical detail and you must deal with interlace issue when re-encoding to other formats. From your description, it looks like the only output that would require 1080i is for PBS. Given this you would be better off using 720@60P as your mastering format for everything else, and the quality difference for 1080i will be minimal...after mission encoding, which will take away most of the extra horizontal detail anyway. Regards Craig ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.