[PLUG] Transcoding MTS vids to something else for frame exctraction

[JP Vossen via plug <plug@lists.phillylinux.org>]

My wife has some MTS videos we took on vacation from which we want to 
extract some frames.  No problem:
```
ffmpeg -hide_banner -loglevel error -nostdin \
 -i $file -ss $start -to $stop -r $fps $dir/$output_file-$loop-%06d.$ext
```

But most of the resulting frames are fuzzy or interlaced, presumably 
because MTS (about which I know nothing) uses a key frame and then diffs 
(whatever that's called).  Note I got the same results using `-r 30` and 
`-r 5`.

I was thinking that I could transcode MTS to something better (read 
much, much larger), then extract the frames I want from that.  I know 
the answer is also `ffmpeg` but...with what settings?

Clues?

TIA,
JP
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