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When I select one file to convert from ".mpg" format to ".mp4" format in Winff, it converts nice! but when I try to convert many ".mpg" files, I see only one file in output folder! and guess Winff always rewrite on it!...How I can solve this problem?

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I'm not familiar with WinFF, but, in general,

for i in *.mpg ; do
WinFF $i $j

should do the trick.

Be sure to run this the first time with 'echo WinFF' in place of 'WinFF' to see what commands will be generated.

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