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All Forums > Tech Talk > Tech Talk Forum Page 58 > Why is fast-forward "jerky" on DVD players?
AuthorPost
licker
Senior Member


Heretic, Iconoclast, Skeptic
1141 Posts
8/03
Posted - Apr 13 2004 : 11:05AM
I'm talking about stand-alone dvd players here, not computers.

When you fast forward a VHS tape, you see a smooth flowing movie at maybe 4X normal speed, but using the full frame rate.

On all the DVD players I have seen, when you fast forward at this speed, you see flick,flick,flick .... a series of still images from the movie at maybe three or four frames per second.

Can anyone explain why it is done this way. Is this true of all players, or are there better quality ones that can provide a "smooth" cue and review like a VHS player does?

Saki
At-Large

2086 Posts
11/99
Posted - Apr 13 2004 : 12:47PM
Keep in mind that the video on a VHS tape is analog, while a DVD is compressed digital. The jerkiness is simply the inability for the decoders in the unit to process the data fast enough. As you FFWD, the player is picking up a point in the future, decoding that frame, displaying it, and then picking another point in the future. Since MPEG-2 keys off the differences between the current frame and the next frame to reduce processing and storage requirements, FFWD'ing really throws that off. The net result is a slow, jerky playback as you're searching in either forward or reverse.

I believe that with higher powered processors, more buffering, etc. that the cue smoothness would improve, but so would the cost of the player.

- Saki [faqs]

licker
Senior Member

Heretic, Iconoclast, Skeptic
1141 Posts
8/03
Posted - Apr 13 2004 : 11:56PM
Thanks Saki

Sounds like the feature may improve in new models as the technology gets better.

I remember the cue on the early VHS recorders was pretty crappy too. The later models fixed it with (i think) multiple video heads and better synchronization.

I know someone with a $1500 Marantz DVD player. I must take a look at the fast forward on that and see if it's any better.

Saki
At-Large

2086 Posts
11/99
Posted - Apr 14 2004 : 10:01AM
Samsung made a line of players called NUON that never found much acceptance due to higher cost and poor marketing. It was intended to be more of a home entertainment center, with video game capability.

Some of the features that are cool are smooth forward/reverse, on-screen FMV thumbnail view of alternate angles, and unrestricted live zoom of any part of the picture--thanks to the graphics processor.

I'm not sure that the really expensive players will buy similar features. The top of the line players tend to use more audio/videophile grade components and use the increased graphics processing to improve the picture quality.

- Saki [faqs]

Linus TR fan
Member

318 Posts
11/03
Posted - Apr 14 2004 : 1:57PM
I have one of the top line of the Nuon Samsung players, and it is much smoother than 2 other players I have. It gets the same thing though once you get to 32 and 64x fast formward or reverse. It does have a lot of great features I still have not seen in other players.
 
licker
Senior Member

Heretic, Iconoclast, Skeptic
1141 Posts
8/03
Posted - Apr 18 2004 : 6:33AM
Well, I checked out the Marantz, and the frame rate is even slower than my cheap chinese player.

The sound quality is something else though. You can hear why people pay the extra money.

All Forums > Tech Talk > Tech Talk Forum Page 58Why is fast-forward "jerky" on DVD players?

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