[linux-dvb] Re: Again a question about V4L and budget cards.

[Gerd Knorr <kraxel@bytesex.org>]

Vincenzo Di Massa <hawk78_it@yahoo.it> writes:

> Il lun, 2003-12-01 alle 22:09, Gerd Knorr ha scritto:
> > Vincenzo Di Massa <hawk78_it@yahoo.it> writes:
> > 
> > > I suppose there is really big value adding v4l support for budget cards.
> > 
> > Why?
> 
> 1) There are tons of good apps that require you to have the /dev/video.
>  thing.

Bad luck ...

> 2) Why should every software care about the type of hardware you are
> using?

To get the best out of it?

> 3) The ability to have better and most stable sw: if every software uses
> its own copy/linkage to ffmpeg, ts2ps... many work is spent fixing
> things twice or more.

There are other ways to fix that (don't copy, use shared libraries ...).

> 4) The use of pipes and other beautifull methods (like playing a file
> while you are recording it) is great to test, study etc. But when you
> are ALWAYS using tricks it means there is something missing in the sw
> you are using.

Yup.  Guess you are just unhappy about the tv apps available for
budget cards?

> I'm trying to expose my point of view, if what I say makes no sense...
> tell me!

(1) It doesn't make much sense performance-wise, when passing stuff
    using a v4l(2)-like interface to the apps you have to copy the
    data way to often.

(2) You lose functionality, being able to just save away the MPEG
    stream for example.

(3) Yoo lose important informations, the timestamps for example (which
    are really important to get a/v sync right).

  Gerd

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