Add ffmpeg video management scripts

.gitignore

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+*.exe

audiomerge.bat

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+@echo off
+IF "%5"=="" GOTO HAVE_0
+ffmpeg -i %1 -i %2 -i %3 -filter_complex "[0]volume=0.2[a];[1]adelay=%4|%4,volume=2[b];[2]adelay=%4|%4,volume=2[c];[a][b][c]amix=3" -c:v copy -ac 2 %5
+GOTO DONE
+:HAVE_0
+ffmpeg -i %1 -i %2 -filter_complex "[0]volume=0.2[1]adelay=%3|%3,volume=1[b];[0][b]amix=2" -c:v copy -ac 2 %4
+:DONE

audiomerge_direct.bat

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+@echo off
+IF "%5"=="" GOTO HAVE_0
+ffmpeg -i %1 -i %2 -i %3 -filter_complex "[0]volume=0[a];[1]adelay=%4|%4,volume=0.2[b];[2]adelay=%4|%4,volume=1[c];[a][b][c]amix=3" -c:v copy -ac 2 %5
+GOTO DONE
+:HAVE_0
+ffmpeg -i %1 -i %2 -filter_complex "[0]volume=0.2[1]adelay=%3|%3,volume=1[b];[0][b]amix=2" -c:v copy -ac 2 %4
+:DONE

list.txt

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+file 'first file.mp4' 
+file 'second file.mp4' 

merge.bat

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+ffmpeg -f concat -safe 0 -i list.txt -c:v copy %1

precrop.bat

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+ffmpeg -ss %1 -i %2 -acodec copy %3