[MPlayer-dev-eng] [PATCH] new mpeg muxer

[D Richard Felker III]

On Mon, Feb 21, 2005 at 11:03:40PM +0100, Nico Sabbi wrote:
> >excellent!
> >so this actually makes playable vcd/svcd/dvd mpeg tracks, with only
> >mencoder and no other tools? i hate vcd because it's horrible quality
> >and a waste of space, but it could be very convenient still!
> >
> >rich
> >
> > 
> >
> yes, but obviously you still need to use dvdauthor and vcdimager to create
> image discs.
> Modern (especially cheap) dvd players can also play [s]vcd discs that 
> contain
> non-standard mpeg1/2: mine plays perfectly vcds with 720x576 mpeg2 and
> 48 khz ac3 straight out of dvb, so there's still something to gain out 
> of these
> old formats, especially if one doesn't have a dvd writer.
> 
>    Nico

ok, at some point someone should make a guide for how to encode
(compliant) vcd/svcd/dvd with mencoder's new mpeg muxer. a few
questions i have right away:

- is there any way to make the muxer handle soft telecine for you
  (tff/rff flags)? i know vcd allows 24fps, but dvd and maybe svcd
  require fake 30fps with stupid flags.

- lavc encodes keyframes (or perhaps the first p frame after a key
  frame?) at very high quantizer trying to maintain cbr, resulting in
  an ugly low-frequency flicker once every gop. is there a workaround?

- what encoder options do you use to make compliant mpeg1/2 video for
  vcd/svcd/dvd? so far i've had luck, but the players i've tested
  might just be forgiving..

- i seem to occasionally get weird out-of-order glitched frames during
  really high motion scenes. is this due to buggy reordering of some
  sort in the muxer, failure to enforce closed gops, or something
  else? i think i can extract small samples that exhibit the problem
  if you want to see one.

anyway, great job! it's amazing that this is finally (mostly) working.

rich