[pvrusb2] MPEG PTSs drifting away

[Mike Isely]

On Sat, 26 Jul 2008, Boris Dores wrote:

> On Fri, Jul 25, 2008 at 07:28:39PM (GMT-0500), Mike Isely wrote:
> > The code in question will be found in pvrusb2-encoder.c.  Look at 
> > pvr2_encoder_configure().
> 
>   I found the solution ! Thank you so much for pointing me in the right
> direction !
> 
>   I imported all the raw commands from the corresponding ivtv function
> (ivtv_start_v4l2_encode_stream in ivtv-streams.c) and proceeded by
> dichotomy. In the end, adding only one command is needed to correct the
> PTSs: it's one of the lines under the comment "Stuff from Windows, we
> don't know what it is" (if Hans is reading this, I guess we can say we
> just got some clues :) ).
> 
>   The corresponding patch follows (didn't bother to attach it instead of
> pasting it inline, as it is clearly trivial):
> 
> --- pvrusb2-encoder.c.orig      2008-07-26 20:30:17.000000000 +0200
> +++ pvrusb2-encoder.c   2008-07-26 20:35:36.000000000 +0200
> @@ -545,6 +545,10 @@
> 
>         ret |= pvr2_encoder_prep_config(hdw);
> 
> +       /* prevent the PTSs from slowly drifting away in the generated MPEG
> +          stream */
> +       ret |= pvr2_encoder_vcmd( hdw, CX2341X_ENC_MISC, 2, 4, 1 );
> +
>         /* saa7115: 0xf0 */
>         val = 0xf0;
>         if (hdw->hdw_desc->flag_has_cx25840) {
> 

I'll get this integrated back into the driver.  Thanks for figuring it 
out.

  -Mike


-- 

Mike Isely
isely @ pobox (dot) com
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