DS Forums

 
 

HD recordings fast forward so quickly. Foxsat HDR.


Reply
Thread Tools Search this Thread
Old 21-06-2010, 13:23
beberex
Forum Member
 
Join Date: Aug 2004
Location: Northamptonshire
Posts: 108

I`ve looked for a similar question but there are so many posts that I thought it would be quicker to just ask.

When fast forwarding an HD recording it seems to really whizzy through it much faster than an SD recording. I take it there`s a technical reason for this. Maybe Graham or Gaseous or anyone really could offer an explanation. Is some kind of compression used to cram the extra HD signal onto the hard drive? Saying that the HD recordings take up much more space apparently.
beberex is offline   Reply With Quote
Please sign in or register to remove this advertisement.
Old 21-06-2010, 13:32
tv-Addict
Forum Member
 
Join Date: Dec 2008
Posts: 148
On a Foxsat HDR, you should have the usual 2x, 4x, 16x, 32x, 64x options, same as SD.
I have not noticed any difference to SD behaviour in the 18 months I have been using mine....
tv-Addict is offline   Reply With Quote
Old 21-06-2010, 13:42
grahamlthompson
Forum Member
 
Join Date: May 2005
Location: Redditch Worcs
Posts: 17,289
HD recordings are compressed using a more efficient and modern encoding technique called H264 (a variant of mpeg4). SD use the older mpeg2 system. Even with more efficient codeing the large amount of additional video data for HD requires more disc space. As said though fast forward is just the same as for SD.

I hardly ever use fast forward anyway, the +2min and -15Sec forward and reverse skip buttons are much more convenient for ad-skipping and if you want to go a long way just tap in the timecode you want eg 0025 will take you straight to 25 mins.
grahamlthompson is offline   Reply With Quote
Old 21-06-2010, 14:19
GaseousClay
Forum Member
 
Join Date: Oct 2008
Location: Worcester
Posts: 4,185
Maybe you're experiencing some optical illusion that gives the impression of a faster transport through the recorded HD media. As tv-Addict says the speeds are the same on SD and HD and Graham points to the fact that more disc space is required to store the data. When transporting through the video stream it could be that as it samples sections of data to output to the display there is a greater amount of data per sample and so the spaces between each sample need to be increased as the read time for each sample would be longer and thus resulting in a more frenetic display output giving the impression that it's 'whizzing' through faster.
GaseousClay is offline   Reply With Quote
Old 21-06-2010, 17:34
beberex
Forum Member
 
Join Date: Aug 2004
Location: Northamptonshire
Posts: 108
Many thanks for your replies guys. Must be an optical illusion as you say. It`s not just that I can barely keep up with the image even at only 4X but the ads seem to end far quicker than with SD. The ad breaks appear to last approximately the same length of time so maybe I`ve got a special box.

I`ve never used the skip forward facility mainly because I wasn`t aware of it. Ive only had it for 18 months though and still trying to figure out all the functions.

Cheers fellas.
beberex is offline   Reply With Quote
Old 21-06-2010, 19:32
Flyer 10
Forum Member
 
Join Date: Dec 2008
Posts: 4,556
Use the skip, its much better, especially for ads. I only use the FF if Im catching up on a game and use x4 until they get into the final 3rd.
Flyer 10 is offline   Reply With Quote
Old 21-06-2010, 21:16
Andrue
Forum Member
 
Join Date: Jul 2001
Location: Brackley, UK
Posts: 16,657
Use the skip, its much better, especially for ads. I only use the FF if Im catching up on a game and use x4 until they get into the final 3rd.
Same here. Something I really wish Sky would add to their boxes.
Andrue is offline   Reply With Quote
Old 21-06-2010, 22:38
Flyer 10
Forum Member
 
Join Date: Dec 2008
Posts: 4,556
Which, the skipping or variable FF?
Flyer 10 is offline   Reply With Quote
Old 22-06-2010, 08:31
peggle
Forum Member
 
Join Date: May 2003
Posts: 215
I have been aware of this since ITV HD started. Their programs fast forward about 4x faster than indicated. So an ITV HD recording on 16x FF will take about 50 to 60 seconds to advance an hour, whereas a SD recording takes about 4 minutes to do the same.

Before their encoder change BBC HD recordings fast forwarded as indicated on the Humax's display. Since the new encoder was introduced however they have speeded up, but not to the same extent as ITV HD.
peggle is offline   Reply With Quote
Old 23-06-2010, 14:56
Frank1
Forum Member
 
Join Date: Oct 2003
Location: Devon UK
Posts: 355
Maybe you're experiencing some optical illusion
Well, I am also experiencing the same "optical illusion".
So much so that I am convinced that the FF/RW speeds are genuinely much faster than they should be for HD recordings.

I normally FF through the ads at 16x on SD recordings but can only excercise proper control at x4 on HD recordings.

Frank
Frank1 is offline   Reply With Quote
Old 23-06-2010, 17:34
Andrue
Forum Member
 
Join Date: Jul 2001
Location: Brackley, UK
Posts: 16,657
Which, the skipping or variable FF?
Skipping. FF is a pain.
Andrue is offline   Reply With Quote
Old 23-06-2010, 17:37
peggle
Forum Member
 
Join Date: May 2003
Posts: 215
It's easy enough to prove.

FF 16x for 1 minute. On SD recordings you will advance to 0.16. on ITV HD its around 1 hour, & BBC HD 20 to 35 minutes.
peggle is offline   Reply With Quote
Old 24-06-2010, 10:56
Flyer 10
Forum Member
 
Join Date: Dec 2008
Posts: 4,556
Skipping. FF is a pain.
Thats because they want you to see the ads.

I can confirm the FF is a lot faster on ITVHD too.
Flyer 10 is offline   Reply With Quote
 
Reply



Thread Tools Search this Thread
Search this Thread:

Advanced Search

 
Forum Jump


All times are GMT. The time now is 09:29.