evazion 8b3ab04724 media file: fix calculation of video/animation duration. ...

Fix how the duration of videos and animated GIFs / PNGs is calculated.
If we can't determine the duration from the file metadata, then play the
entire video or animation back using FFmpeg and scrape the duration and
frame count.

This is necessary for things like WebM files where the duration metadata
is optional, or animated GIFs and PNGs that don't have a duration field
in the metadata, only a frame count and a sequence of frame delays.

2021-10-17 20:15:51 -05:00

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