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Linshizhi
ffmpeg.wasm-core
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dc52e620
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dc52e620
authored
Jun 10, 2015
by
Lou Logan
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doc/ffmpeg: remove tips
Ancient and misleading. Signed-off-by:
Lou Logan
<
lou@lrcd.com
>
parent
11f86ec2
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@@ -1299,47 +1299,6 @@ If no such file is found, then ffmpeg will search for a file named
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@@ -1299,47 +1299,6 @@ If no such file is found, then ffmpeg will search for a file named
@c man end OPTIONS
@c man end OPTIONS
@chapter Tips
@c man begin TIPS
@itemize
@item
For streaming at very low bitrates, use a low frame rate
and a small GOP size. This is especially true for RealVideo where
the Linux player does not seem to be very fast, so it can miss
frames. An example is:
@example
ffmpeg -g 3 -r 3 -t 10 -b:v 50k -s qcif -f rv10 /tmp/b.rm
@end example
@item
The parameter 'q' which is displayed while encoding is the current
quantizer. The value 1 indicates that a very good quality could
be achieved. The value 31 indicates the worst quality. If q=31 appears
too often, it means that the encoder cannot compress enough to meet
your bitrate. You must either increase the bitrate, decrease the
frame rate or decrease the frame size.
@item
If your computer is not fast enough, you can speed up the
compression at the expense of the compression ratio. You can use
'-me zero' to speed up motion estimation, and '-g 0' to disable
motion estimation completely (you have only I-frames, which means it
is about as good as JPEG compression).
@item
To have very low audio bitrates, reduce the sampling frequency
(down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
@item
To have a constant quality (but a variable bitrate), use the option
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
quality).
@end itemize
@c man end TIPS
@chapter Examples
@chapter Examples
@c man begin EXAMPLES
@c man begin EXAMPLES
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