[FFmpeg-trac] #5160(documentation:new): Document how -fs reduces size

[FFmpeg]

#5160: Document how -fs reduces size
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             Reporter:  jidanni      |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:
              Version:  git-master   |  documentation
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Misaki):

 It appears to stop, similar to pressing ctrl-C in Linux, once detected
 size exceeds the option. It finishes encoding the remaining frames. So,
 using -tune zerolatency for h264 makes it more accurate, while having a
 high bitrate/low crf makes it exceed the size.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5160#comment:1>
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