[mpeg2] Re: Transport Stream for the kfir1 driver

["Juergen Weiss" <weiss@uni-mainz.de>]

Hi,

as I already posted a while ago:

There seems to be a problem with the calculation of
the Bitrate for Transport Stream.

Setting the TransportRate to

    P->TransportRate = vidrate+RateArray[kfir->Params.AudioBitRate] *
1000;

does not seem to be correct and leads to incorrect ts pcr fields.  The
windows driver does not have a fixed relation between BitRate and
TransportRate.  With the following change, the problem went away. Not
sure, if this change solves your problem.

        /*
         * Rate of Transport Stream
         * if choosen too low, ts pcr fields are wrong
         * is there any formula for minimal transport stream rate?
         * a factor of 1.15 seems to work for 
         * bitrates at least between 0.8 to 4.5 MBit/s
         */
        P->TransportRate = ((P->BitRate+RateArray[P->AudioBitRate] *
1000) * 115) / 100 + 80000;



Juergen Weiss	  | Universitaet Mainz, Zentrum fuer Datenverarbeitung,
weiss@uni-mainz.de| 55099 Mainz, Tel: +49(6131)39-26361, FAX:
+49(6131)39-26407


> -----Original Message-----
> From: Deepak S Kotian [mailto:dkotian1@rediffmail.com] 
> Sent: Thursday, September 26, 2002 9:19 AM
> To: mpeg2@linuxtv.org
> Subject: [mpeg2] Transport Stream for the kfir1 driver
> 
> 
> Hi,
> 
> I am using the Kfir1 driver for the LINUX.
> We have observed, when we are using
> Transport stream on the Kfir1 side and we
> try our decoder, it takes more time
> to decode, resulting in some delay.
> The program stream seems to be OK.
> 
> We have tired other encoder boards for
> Transport stream, it seemed OK.
> 
> Any idea/suggestion on how one
> play with the Tranport Stream generated
>  from Kfir1 board using the Kfir1 driver.
> Please let me know
> 
> Thanks and Regards
> Deepak
> 
> 
> 
> 
> 
>