RE: [libdv-dev] Where to go ?

[Arne S. <ar...@sc...>]

My wish list:

speed: a way do do 25 or 30 fps even on slower hardware, maybe with a half 
or quarter size image and other tradeoffs. Currently, scaling down the 
image slows it down even more (it's an additional phase).

quality: somebody said the mmx routines are less precise than real floating 
point routines. For image processing (conversion to mpeg) I need the best 
possible input, regardless of cpu time. These would be overnight jobs 
anyway.

de-interlacing: the interlacing effects are annoying.

I do not believe we need more features in the sample program. There are 
plenty of Xv-, SDL- and other sample programs around.

Audio might need some work and testing. I have some audio code in the 
dvgrab program (for writing type 2 avi files, which need a separate audio 
track) and I am not sure everything is correct. It sounds reasonable with 
my equipment though. I did not look into libdv's recent audio additions 
yet.

Arne


-----Original Message-----
From:	Stefan Lucke
Sent:	Friday, December 29, 2000 9:31 PM
To:	lib...@li...
Subject:	[libdv-dev] Where to go ?

Hi,

what about the future of libdv ?

During the last months Buck is the only one of the original developers
who takes care of libdv.

- output format selection
  Our sample applicatiopn should take care of
  - direct output (X11) only if desired.
  - possible intermix of PAL/NTSC
  -> select output buffers in a way that at least two frames could
     be placed in.
- audio extraction
- sample application
- tests cases
- encoding (dct88 vs. dct 248)
  When to use dct248 insteadof dct 88
  From my experience 248 is used when there are significant differences
  in Y values within a macro block (segement)
  Upper left <-> lower right.
  So for encoding we need a function like
	dv_enc_use_dct248 (dv_macroblock_t *mb)

- new functions:
	typedef enum { normal, wide} dv_format_t;

	int		dv_enc_use_dct248 (dv_macroblock_t *mb)
	int		dv_dec_is_wide_screen (dv_frame_t *fr)

	dv_format_t	dv_notify_format_change (void);
	dv_system_t	dv_notify_system_change (void);
--

mfg

  Stefan Lucke (lu...@sn...)

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