Its called progress, I think.Papa J said:Who would have thought we would be able to change channels in only 8 seconds in this day and age? Amazing! I bet in 100 years DTV will be able to cut that time in half.
My TV [OTA] takes 2 sec to change channel.TomCat said:Its called progress, I think.
I remember having cable converters that would change channels as fast as you could push the button; faster in fact than the TV itself (which felt it had to mute video and audio between channel changes).
But really, even though MPEG-4 can have I frames as far as 6.5 seconds apart, channel acquisition time should not take very long, certainly not 8 seconds. Turning native off can help, but DTV sends an I frame every 2 seconds or so, meaning that acquisition time should be no longer than that, and average half of that. They also cleverly route around the HDD R/W delay, so that is not a factor.
If you have a particularly stinky relationship between the HDMI out in the DVR and the HDMI in on your TV or AVR, that can lengthen the time a second or two. Kinda rare, anymore.
There also seems to be some bushwa in the actual IR response time, which does not seem to help. But it is not unusual for a selected program to take a good 10 seconds to begin to play, or to delete; a behavior that seems to have begun coincidental with the HD GUI download.
Its an old story; trying to shove 8 lbs into a 5-lb bag.
Yeah...I don't get that either.Barry in Conyers said:Hard to find a good reason for a channel change taking 8 seconds or hard to find a good reason for trying to keep it a secret? Maybe both?
I won't claim that I know for sure, but it seems obvious that it is a HDMI handshake issue. Not that this could be considered a "good" reason.veryoldschool said:...Changing from MPEG-4 720p to 1080i, or back takes damn near 8 full sec.
It's hard to find any good reason for this with native on.
I'm not going to claim I know either.TomCat said:I won't claim that I know for sure, but it seems obvious that it is a HDMI handshake issue.
Then I think for once we may be in agreement. A tuner/demux/decoder recognizing the format flag and the TV readjusting its pixel format to match is pretty easy stuff, and it happens in the blink of an eye; A particular byte in the packet header tells the multi-format switcher in the display what pixel format to assume, and it immediately obeys. Its all hard-coded, and probably completes well before channel/source acquisition even completes, which requires a full GOP to be decoded first.veryoldschool said:I'm not going to claim I know either.
I do know:
Native off and toggling between a 720p & 1080i channel, takes half the time it takes to toggle between the same two channel with native on.
This means a good 3-4 second longer delay for the image.
"Maybe" it's part of an HDMI issues, but it would have to be only resolution related, as removing the change of resolution cuts the time in half, which isn't but a second or so longer than the TV takes to do the same toggling, of the same channels, via its antenna.