It is very hard for me to believe that 1080i/25 or 30 takes less than 1080p/24 for equivalent quality. (Assuming equal graininess)
- Tom Craig Birkmaier wrote:
At 7:43 PM -0500 2/27/09, Manfredi, Albert E wrote:So, am I to understand that with MPEG-2 compression, you need at the very least: 21 Mb/s for 720p/50 (or 60) 24.2 Mb/s for 1080i 25.6 Mb/s for 1080p24 (or 25)For equivalent quality, YES.The fact is, fully granting that the end results might not be as good, that MPEG-2 compression is commonly used for the formats listed above at rates very close, if not identical, to those quoted as H.264 recommendations. Take PBS stations with their one HD and three SD streams, all in 19.2 Mb/s. How much would the HD streams get, on average? The 50 percent improvement achieved with H.264 does not translate to "can't be done with MPEG-2 at those same rates."It could be done with MPEG-2 at half the rates proposed for h.264. But you get what you pay for when you start to quantize away the content...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.
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