removesilence: add a property to output buffer without timestamp gap

Submitted by Nicola @drakkan

Link to original bug (#671954)

Description

Created attachment 209553
add a property to output buffer without timestamp gap

Please review the attached patch, thanks

Patch 209553, "add a property to output buffer without timestamp gap":
0001-removesilence-add-a-property-to-output-buffer-withou.patch