[vdr] Re: [PATCH] (DVB-T) statmux fix vbr tagging for pic header

[John Grant <john.grant@savcredit.co.uk>]

Klaus Schmidinger wrote:

> > After a lot of talking and speculation and testing out I've come up with an
> > experimental, dirty patch for vdr-1.1.31 to work around problems with
> > either the firmware, the drivers or the way some mux encoders send the
> > headers for variable bitrate streams.
> > ...
> > Here's the patch
> > http://www.mpex.net/riovolt/vdr-statmux-vbr_vbv_delay.patch
> > comments from testers appreciated.
> >    
> To avoid an additional place where the data is scanned I'd like to suggest
> putting this into cRemux::ScanVideoPacket(), since there we are already
> sync'ed on an I-frame:
>
> --- remux.c     2003/04/26 15:07:41     1.15
> +++ remux.c     2003/05/15 16:00:00
> @@ -501,6 +501,13 @@
>          if (Data[i] == 0 && Data[i + 1] == 0 && Data[i + 2] == 1) {
>             switch (Data[i + 3]) {
>               case SC_PICTURE: PictureType = (Data[i + 5] >> 3) & 0x07;
> +                               if (PictureType == I_FRAME) {
> +                                  uchar *p = (uchar *)Data;
> +                                  //printf("VBV: %02X %02X %02X\n", p[i + 5], p[i + 6], p[i + 7]);//XXX
> +                                  p[i + 5] = 0x8F;     // 10001111 http://members.aol.com/mpucoder/DVD/mpeghdrs.html#picture 
> +                                  p[i + 6] = 0xFF;     // 11111111 tag vbv for variable bitrate
> +                                  p[i + 7] = 0xF8;     // 11111000 ditto
> +                                  }
>                                return Length;
>               }
>             }
>  
Assuming that I don't have the wrong end of the stick here, I applied 
the above to 1.1.29 and it made no difference to the
blank screen problem. Additionally I have noticed that I cannot 
successfully play any recording made in the UK of BBC2, which
as far as I'm aware is a VBR channel - recordings play for ~5 seconds 
and then just stop on a blank screen. Was the
above supposed to fool  vdr into being able to handle channels like that ?

John



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