added video type ffmpeg#1

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fschuett wants to merge 20 commits intoOpenSourcePhysics:masterfrom

fschuett:master

Commits on Apr 21, 2014

added video type ffmpeg
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Commits on Apr 22, 2014

fix: each packet has only at most one video frame
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add video type 3gp, ogv
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Commits on Apr 27, 2014

added thumbnail tool, restructured to avoid code doubling
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activated ffmpeg thumbnail tool
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fix BgrConverter memory free crash
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make overlay loading work, test ThumbnailTool
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fix timebase not initialized
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Commits on Oct 24, 2014

Remove xuggler from source code.
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Commits on Apr 12, 2015

Fix for ffmpeg lib 2.6
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Commits on May 29, 2015

Make video work with frame caching.
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Fix shortTime, fix stepping with flush_buffers.
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Commits on Sep 12, 2015

Convert line endings to lf.
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Commits on May 4, 2016

Merge branch 'master' of github.com:OpenSourcePhysics/video-engines
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remove xuggle and deps
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Commits on May 5, 2016

fix some problems
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Commits on Oct 5, 2017

Merge remote-tracking branch 'upstream/master'
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remove method finalize
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Commits on Oct 7, 2018

Merge branch 'master' of github.com:OpenSourcePhysics/video-engines
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Commits on Nov 14, 2019

Merge remote-tracking branch 'upstream/master'
fschuett
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