[MPlayer-cvslog] r32035 - in branches/1.0rc4: . libmpdemux/demux_lavf.c

Aurelien Jacobs aurel at gnuage.org
Wed Sep 1 23:36:47 CEST 2010

On Wed, Sep 01, 2010 at 06:22:27PM +0200, Reimar Döffinger wrote:
> On Wed, Sep 01, 2010 at 04:42:02PM +0200, Aurelien Jacobs wrote:
> > On Wed, Sep 01, 2010 at 08:05:27AM +0200, Reimar Döffinger wrote:
> > > Will you implement it?
> > 
> > Probably yes.
> > But only after I get the ASS and SubRip decoder in libavcodec (currently
> > working on it) and that I make use of them in av_sub.c.
> > The end_time parsing might be implemented in av_sub.c (I haven't checked
> > yet where is the best place).
> Huh? If you use av_sub, the subtitle decoder certainly _must_ fill
> in sub.end_display_time, so why would you need to parse them?

Oh, yes. I also thought about this at some point and then forgot about
it. This is probably the place to set end_time.

> > Are you aware of anything else broken in lavf (mkv related) ?
> There is a roundup issue on a webm test stream, but I haven't
> even verified it is even valid.

Thanks for pointing to the issue and showing a possible fix !

> > > > No, the demuxer generally don't have the subtitle display duration
> > > > as a field. Matroska is really an exception here, but avi, nut and
> > > > others don't have such a field.
> > > 
> > > That doesn't make it less silly to have to do a full sprintf->sscanf
> > > roundtrip when the value we want is already there.
> > 
> > So are you saying that every single lavf user should implement this
> > 
> >   if (lavf->subtitle_duration)
> >       duration = lavf->subtitle_duration;
> >   else
> >       sscanf("...", &duration);
> > 
> > instead of just this ?
> > 
> >   sscanf("...", &duration);
> > 
> > If so, I guess we have a different definition of what's silly...
> No, I think that every application having to do the sscanf is silly.

I didn't say to the application, I said to lavf user. The demuxed stream
should obviously be feed to lavc, not directly to the player.

> However leaving the whole thing to a ASS decoder instead would be ok
> as well.

That's what I had in mind.

> However, implementing "ASS parser take 3" in MPlayer isn't reasonable.

IMHO MPlayer shouldn't contain any single bit of ASS handling.
Subtitle tracks should be decoded by lavc and rendered by lavfi...
But the road is still long before we get there...

> If a FFmpeg ASS decoder doesn't work for us I guess reusing the subreader
> code would be reasonable as well (but not really good though).

The (upcoming) decoder has to work for MPlayer (and any other player) or
will have to be improved. The point of lavc is to be reused everywhere,
so it has to fit all kind of usage including MPlayer.


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