[MPlayer-users] Re: Mpeg2 encoding results
nsabbi at libero.it
Mon Sep 8 11:39:53 CEST 2003
D Richard Felker III wrote:
>[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>>I added scplx_mask=0.2 to the encoding parameters and it made miracles! Why
>>didn't you say it sooner? :)
>>Now blocks seem to have almost completely vanished :)
>>I wonder if 0.2 is a bit too high, what value do you suggest?
>>Is it possible to instruct lavc to encapsulate the cropped image into a
>>larger frame, so as to
>>encode only the useful part of the video and to add it black borders to keep
>>compatible with dvds?
>Not directly. But you can use -vf expand with the right options. Try
>to make it so that the transition to black border lines up *exactly*
>on a multiple-of-16-pixels boundary (or at least multiple of 8) for
>maximum quality. You should do this even if it requires scaling the
>movie slightly first (i.e. slight aspect distortion), since it should
>make a big difference in the quality you get at a fixed bitrate. Of
>course if you're making dvd rather than svcd, you can just use a huge
>bitrate, so it doesn't matter so much.
Good, it works well.
While muxing the video and audio streams with mplex, I noticed that the
program reported the right video bitrate, but a
huge mux rate (something like 14 Mb/s). How does it calculate this value?
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