[MPlayer-users] Re: Mpeg2 encoding results
nsabbi at libero.it
Mon Sep 1 18:56:04 CEST 2003
Jonathan Rogers wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Nico wrote:
>> Well, the quality was very good, but both movies showed the usual
>> problem that I find in every lavc encoding (mpeg1/2/4):
>> black areas show many visible greyish blocks, at least when read from
>> a DVD player.
> Just out of curiosity, have you found an MPEG-4 encoder that doesn't
> have this problem as much at the same BPP?
yes, Xvid satisfies me much more, especially because it almost never
shows this problem.
I also made some movies with both xvid and lavc (and the same
settings), and I always liked much more the one made xvid;
now that I think of it lavc seems to suffer from another main problem:
I call it wormito because it's not like mosquito that is spread in dots
without continuity; wormito shows continous lines like worms moving
> I haven't noticed XviD or DivX doing much better, but maybe I just
> haven't looked closely enough. Maybe lavc doesn't scale up to high
> bitrates as well as other encoders?
>> Mplayer is so good at decoding that it deceives the eyes, showing a
>> good picture (blocks show less) even when it's bad :)
> It seems to be somewhat accepted that video quality is a function of
> both the encoder and decoder, though there is clearly more of
> challenge in the encoding. Maybe it's that MPEG-4 gives much more
> freedom for the decoder to enhance quality than MPEG-2 and the lavc
> encoder and decoder are essentially MPEG-4 encoders, even in MPEG-2
> mode. Or, perhaps DVDs allow for such high bitrates that they don't
> typically need good decoders to get good results.
I guess that DVD players expect to have near-perfect, and high bitrate,
movies that don't need post-processing.
> Jonathan Rogers
> RTFM!!! http://www.MPlayerHQ.hu/DOCS
> Search: http://www.MPlayerHQ.hu/cgi-bin/htsearch
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