Terje, I remember you asking about HDV documentation last week. I had posted this list of HDV resources a while back, but maybe you'd find these links interesting, if not helpful:
General http://www.hdvinfo.net/ HDV resources from the above site: http://hdvinfo.com/resources/index.php Understanding HD formats (micro$oft..sssssh!!) http://www.microsoft.com/windows/windowsmedia/howto/articles/UnderstandingHDFormats.aspx This article was a very good intro, but now its 404: http://www.gyhduser.com/article.php?filename=What-is-HDV- Good article about data rates and GOP info: Shoot Review - JVC JY-HD10 (Aug 1, 2003) http://digitalcontentproducer.com/cameras/revfeat/video_jvc_jyhd/index.html How To Edit HDV (Sep 1, 2003) http://digitalcontentproducer.com/hdhdv/depth/video_edit_hdv/index.html HDV Sweet Spot (Sep 1, 2004) http://digitalcontentproducer.com/videoencodvd/revfeat/video_hdv_sweet_spot/index.html HDV in the Real World (July 1, 2005) http://digitalcontentproducer.com/hdhdv/depth/video_hdv_real_world/index.html A few other HDV articles HDV in India (Mar 1, 2004) (more tech info at bottom of article) http://digitalcontentproducer.com/hdhdv/depth/video_hdv_india/index.html HD to DVD (Apr 1, 2005) http://digitalcontentproducer.com/hdhdv/depth/video_hd_dvd/index.html http://pro.jvc.com/prof/attributes/article_rev.jsp?model_id=MDL101394&feature_id=09 scott -------------- Original message ---------------------- From: "Terje J. Hanssen" <[EMAIL PROTECTED]> > On Thu, 1 Feb 2007 Dan Streetman wrote: > > > > Ick, it's the 4:2:0 chroma sampling, I believe. Why oh why doesn't > > HDV use 4:1:1 or 4:2:2? > > > > Without being any expert on this, my understanding is that > > 4:1:1 > color sampling as used in NTSC DV25, is considered to be a bad format to > transcode to MPEG-2 for DVD video disks, which do use 4:2:0. This > misalignment of color samples results in a final 4:1:0 color space or > only 12,5 percent of the original chroma information (this problem > doesn't exist in PAL DV25 which itself also applies 4:2:0 color > sampling) according to: > http://www.humanvalues.net/hdv/#dv25 > > 4:2:0 > sampling format and 8 bit quantization used for HDV in general, does for > HDV 1080i or MPEG-2 [EMAIL PROTECTED] occopy the maximum 25 Mbit/s bitrate to > be > recorded on miniDV tapes ..... > http://en.wikipedia.org/wiki/HDV#Specifications > http://www.expandore.com/product/Sony/Proav/model/HDV/QNA.htm#HDV%20Specificatio > ns > > 4:2:2 > as used in MPEG-2 [EMAIL PROTECTED] is "bitrated" at 80 Mbit/s ans is (was) > examplified for "potential future MPEG-2 based HD products from Sony and > Panasonic". > http://en.wikipedia.org/wiki/MPEG-2#Profiles_and_Levels > > > And at the same time two questions I myself have been wondering about > looking in the last table: > > Q1) > Maybe someone here can explain what makes the difference between HDV > 1080i at 25 Mbit/s and its MPEG-2 profile [EMAIL PROTECTED], which is tabeled > to > use 60 Mbit/s below > > Q2) > And at the same time as I myself have been searching for a better > Analog->Digital video converter than just DV25/1394 with the limited > bitrate and color space 4.1:1: > Shouldn't a converter using the MPEG-2 profile [EMAIL PROTECTED] with > 720x576(480) > resolution, 4:2:2 color space and bitrate >= 25 Mbit/s over 1394 have > the potential for a better result than DV25? > > > Terje J. Hanssen > > > > > _______________________________________________ > Cinelerra mailing list > [email protected] > https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
