[linux-dvb] Re: Fastest way to display a bitmap on DVB-s

[Frantisek Bocek <bocekf@iol.cz>]

Hi,

The card can handle also I-frame-only mpegs.
I tested I-frame only streams up to 20 Mbits/s.
While  5 Mbits/s gives poor quality, 10 Mb/s is good and at 15Mbit/s the difference
between the I-frame only picture and the original is hardly noticeable.
At 20 Mbit/s big problems with the speed occur. I recommand not to use bitrates >15Mb/s.
(anyway the MPEG decoder is not supposed to handle such high rates)
The original picture has 720x576 pixels. 

But if you want to display divx movies on the DVB card, it is better to recompress them
into a normal MPEG-2 stream (containing I, P, B frames). There is an excelent software
(under Windows though)  called tmpgenc which does the job greatly. Here only a few Mbits/s
will provide an excelent quality even at full 720x576 resolution. 

Frantisek


----- Original Message ----- 
From: "Roland Praml" <pram2000@web.de>
To: <linux-dvb@linuxtv.org>
Sent: Tuesday, May 08, 2001 3:19 PM
Subject: [linux-dvb] Fastest way to display a bitmap on DVB-s


> Hi,
> 
> does anybody know what's the best way to display a bitmap (with low CPU
> usage)?
> I have written a small programm with that I can decompress
> divX movies (I already can write an uncompressed "bitmap stream" to HDD)
> So my idea is to send the stream to the DVB-s card.
> Is it possible to send a bitmap to DVB driver so that it is displayed
> fullscreen. (I need to do that 25 times per second). Or should I go an
> other way and reencode the stream as MPEG ? (can the card handle a stream
> that only contains I-frames, I think this will make some things easier?)
> 
> I don't know if it will be ever possible to view DivX (or other avi's) on
> a DVB's but I'll give it a try.
> 
> CU
> Roland
> 
> 
> 
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