prevent empty vfilter #115
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The current code adds a trailing comma in case no extra video filters are defined. At least with my version of ffmpeg (5.1.6-0+deb12u1) this does not work and leads to:
No such filter: ''
Which is: ffmpeg interprets the (empty) part after the comma as filter and does not have such a filter.
The patch only adds the comma if the extra filters are defined and are not empty.