> I then have a good result but with theses (lot of) messages in dmesg :
> 
> cxm0: encoder dma not enough buffer space free

The driver uses a ring buffer consisting of 50 buffers each roughly
64k in size to buffer data from the card which is arriving in real
time.  The error message occurs when an application (i.e. mplayer)
fails to consume the data in a timely fashion.  Some possible
solutions:

  1) Better video card.  Personally I like the ATI Radeon cards.

  2) Better Xserver (i.e. XFree86 4.4) which supports using the
     video card hardware for things like colorspace conversion
     and MPEG motion compensation.  This is of course assuming
     your video card has hardware for those sorts of things.

  3) Faster processor.

  4) More memory (only if your machine is actually swapping).

  5) Modify mplayer to implement application real time buffering
     using METEORSSIGNAL (basically copy libmpdemux/tvi_bsdbt848.c
     to libmpdemux/tvi_bsdcxm.c and start hacking) or try increasing
     CXM_SG_BUFFERS.  This only helps if the problem is due to large
     bursts of data ... it will not help if your machine is simply
     not fast enough to keep up with the average data rate.

  6) Enable MPlayer's frame drop option (more of a workaround
     than a solution).

-- John
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|   Feith Systems  |   Voice: 1-215-646-8000  |  Email: john@feith.com  |
|    John Wehle    |     Fax: 1-215-540-5495  |                         |
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