[vdr] Re: Implementing new device, but video is choppy

[Michal Dobrzynski <michal@appl.com.au>]

I have no idea what I am talking about but have you checked that the 
problem is not buffer related? ie is the hardware decoder being 
constantly fed or could the choppiness be caused by the fact that there 
is not a continuous stream of data being sent for decoding?

Regards,
Michal

On 14/01/2004, at 2:05 AM, Philippe wrote:

> Hi,
>
> I'm working on a new device.
>
> My device is working pretty well when I play some video from a 
> recording :
>
> I have the following problem :
>
> When I try to watch a channel, the video is really choppy (only IFRAME 
> or
> something like this).
> When I record the channel an the I play it back, the video is perfect.
>
> My device has an hardware MPEG2 decoder which must be fed with ES 
> streams.
> To write my device code, I used the video handling from the SoftDevice
> plugin.
> As far as I can understand the code of the softplugin, it seems that it
> strips the header from the packet sent to the playvideo function.
>
> Here is my understanding :
> 1) received packet P
> 2) filter P (to find out if it's video or audio data)
> 3) strip out the header of P
> 4) send the packet P without it's header to the decoder.
>
> Can you tell me if I'm right there :
>  - Packet P is PES
>  - Packet P without header is ES
>
> How can I find the start data of an ES stream to drop everything 
> before the
> first starting point found ?
>
> Anyone has a clue ?
>
> Thank you
>
> Philippe


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