= Video Sampling - Loop based video editing =

== Edit Decision List ==
On startup, Veejay will create an Edit Descision List, which is a linear list
of all the video files you entered on the commandline.
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On editing (for example , with GVeejay), changes will only affect the Edit Descision List
and not your original video files. 
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== Sample ==
On top of the Edit Decision List, Veejay allows you to create new selections (samples)
from the EDL. However, a sample is more than a simple selection alone.

Each sample has:
 * Looptype  (Normal, Play Once, Bounce (pingpong) )
 * Trickplay (Play forward / backward at different speeds) 
 * Start / End marker points for video scratching
 * Sample start / ending position 
 * FX Chain
 * History List 
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All properties can be updated in realtime , updating the sample's starting and / or ending position
will result in a sample-restart.
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When mixing or combining multiple samples (by chaining effects), veejay will:
 * Loop the mixing sample B if its shorter
 * Continue playing the mixing sample B on subsequent loops of sample A

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In both possibilities, the loop (play) direction of the sample is respected. 
The only exception is the FX Chain of the mixing samples ; The effect chain is
only rendered for the current playing (top) sample.
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When adding Mixing Effects to the FX Chain, veejay will
 * Use the top playing video as master sync
 * Restart the sample if bezerk mode is off (default) so every performed loop is identical to the previous loop, or if bezerk mode is on
 * Keep on playing (every following loop is a bit more off)
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The history list can be used to (temporary) record samples to a new Edit Descision List, which
is placed parallel to the sample. This allows you to switch between rendered contents, while
keeping the FX Chain and sample properties in tact.


== Samplelist ==

Samplelists are saved independently from the Edit Decision List , making them interchangeable
with other Edit Decision Lists (as long as the total video duration matches).
Of each sample, all properties are saved including the Effect Chain.