HDV recording does not store each individual frame. To save space HDV stores a “key” frame, and then for the next
few frames it only stores the ‘changes’ relative to the key frame. Then the camera captures another key frame,
and carries on with this process as you shoot. The name for this “Key Frame + subsequent frames with the changes”
is called a Group of Pictures (GOP). This recording process is the same used on your DVDs, called MPEG-2 video codec.
So when a drop out occurs with HDV footage, the very next frame does not have
all the information needed to build the picture that you wanted to show. Until the next key frame comes along your video signal
will be scrambled and you could lose an important shot.
Camcorder Technique Workshop for November
Originally, we had thought about an editing workshop in November…but
with some feedback from others, Dave and I have re-visited and revised that idea.
We’ve assembled a list of exercises that will help novice camcorder
users learn how to use their camcorders better---and for more skilled shooters, it will be a chance to test their knowledge
We have to set a date and location, but it likely will be mid-November (14th
to 16th) so charge up your batteries and get ready to have some fun.
I’ve submitted a proposal to purchase a series of training DVDs for
the club library at a total cost of $199.99.
Videomaker: Basics of Videography
Videomaker: Advanced Shooting
Advanced Broadcast Camera Techniques
How to Shoot Super Videos
Home Video Hits (VHS)
Shoot Great Video with your miniDV Camcorder
A total of 9 DVDs and one VHS tape, with 12 hours of instructional video.
Ref: For HDV see: http://en.wikipedia.org/wiki/HDV