[FFmpeg-user] Filter video using libavfilter is longer than input video

[Roger Pau Monné]

Hello,

I'm trying to develop a new filter using the avfilter API, but it
seems to add some frames at the beginning of the video, so input and
output videos don't have the same duration (for example if I use an
input video of duration 00:01:41.60 the output video has a duration of
00:01:41.64). I don't know if there is a problem with my filter, I
don't think I'm adding any frames, but it's the first time I use it,
so I'm attaching the filter I'm working on to see if anyone knows what
the problem might be.

Thanks, Roger.
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