fix the bug which leads localCodecParameters.AvCodecGetChannels() get…#82

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jason12360 wants to merge 11 commits intogiorgisio:masterfrom jason12360:master

Commits on Jul 22, 2020

fix the bug which leads localCodecParameters.AvCodecGetChannels() get wrong result in 64bit system
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Commits on Jul 23, 2020

add some methods and tag some deprecated methods
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convert hello_world.c from ffmpeg-libav-tutorial to tutorial02.go
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Commits on Jul 24, 2020

add some functions, also provide an easy way to read frame
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finish tutorial02
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Commits on Jul 27, 2020

add some functions and modified AvformatAllocOutputContext2 in order to pass in nil pointer
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finish tutorial2
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Commits on Aug 19, 2020

add new tutorial and add some missing functions
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Commits on Aug 26, 2020

add tutorial5
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Commits on Aug 27, 2020